Feel free to resume discussion on Github: Discussions · bitwarden/server · GitHub Discussions · bitwarden/clients · GitHub Discussions · bitwarden/mobile · GitHubI think the . Or it could just be a low end phone and then you should make your password as strong as possible. Unless there is a threat model under which this could actually be used to break any part of the security. If your keyHash value is from later than June 9, 2021, you will need to save a copy of the HTML code of this webpage. With Bitwarden's default character set, each completely random password adds 5. When using one of the Desktop apps, the entire encrypted vault (except for attachments) is stored in a file named data. Unless there is a threat model under which this could actually be used to break any part of the security. Following the May update, our end users will be prompted that their KDF iterations are not at the recommended 600,000. Therefore, a rogue server. Bitwarden has recently made an improvement (Argon2), but it is "opt in". Now it works! Seems to be a bug between the BitWarden extension and a Vault that has 100000 KDF iterations. Kyle managed to get the iOS build working now,. Because the contents of this file are expunged if you ever log out (which can happen unexpectedly, if your session expires, if you change. json: csp should be "extension page*s*", and add wasm-unsafe-eval so we can load the wasm. Security expert, Dmitry Chestnykh, had mentioned this problem in 2020 , yet it still remains unresolved. Regarding password protected exports, the key is generated through pbkdf2 and stretched using hkdf. In the thread that you linked, the issue was that OP was running third-party server software that is not a Bitwarden product, and attempting to use a Bitwarden client app to log in to their self-hosted server that was running incompatible software. Hey @l0rdraiden see earlier comments, including Encryption suggestions (including Argon2) - #24 by cscharf for more information. Accounts created after that time will use 600,001, however if you created your account prior to then you should increase the iteration count. 2 Likes. But they don’t even store the kdf / iterations in the database, so changing it would require another database migration / backend change which I didn’t really feel like taking on considering how low the risk for a send is anyways. Bitwarden Community Forums Master pass stopped working after increasing KDF. But they don’t even store the kdf / iterations in the database, so changing it would require another database migration / backend change which I didn’t really feel like taking on considering how low the risk for a send is anyways. If that was so important then it should pop up a warning dialog box when you are making a change. Because the contents of this file are expunged if you ever log out (which can happen unexpectedly, if your session expires, if you change your master password or KDF iterations, if Bitwarden resets their servers, etc. Higher KDF iterations can help protect your master password from being brute forced by an attacker. After changing that it logged me off everywhere. No adverse effect at all. Following the May update, our end users will be prompted that their KDF iterations are not at the recommended 600,000. When you change the iteration count, you'll be logged out of all clients. I didn’t realize it was available as I had been looking in the extension and desktop apps, not realizing a different option existed in the web vault. If you want to do manual brute-force guesses, go to Bitwarden’s interactive cryptography tool. This seems like a delima for which Bitwarden should provide. The recent LastPass breach has put a lot of focus on the number of PBKDF2 hash iterations used to derive the decryption key for the password vault. I don’t think this replaces an automatic migration or at least global notifications for iterations set below the default, but it is still a good suggestion. Ask the Community Password Manager. One of the Hacker News commenters suggestions which sounds reasonable is to upgrade the user to the current default KDF iterations upon a change of the master password. Password Manager. This was mentioned as BWN-01-009 in Bitwarden’s 2018 Security Assessment, yet there we are five years later. But they don’t even store the kdf / iterations in the database, so changing it would require another database migration / backend change which I didn’t really feel like taking on considering how low the risk for a send is anyways. Since I don't expect that Bitwarden needs to frequently add new KDF's with new parameters, this pull request simply adds 2 integer columns for the memory consumption, and the parallelism of the KDFs. Scroll further down the page till you see Password Iterations. Unless there is a threat model under which this could actually be used to break any part of the security. Also, check out this Help article on Low KDF Iterations: and the KDF Iteration FAQ:. By the way, Sends (which I don’t really use) also have 100K fixed pbkdf2. Bitwarden Increases KDF iterations to 600k for new accounts and double-encrypts data at rest. I went into my web vault and changed it to 1 million (simply added 0). 8 Likes. In the thread that you linked, the issue was that OP was running third-party server software that is not a Bitwarden product, and attempting to use a Bitwarden client app to log in to their self-hosted server that was running incompatible software. Then edit Line 481 of the HTML file — change the third argument. I increased KDF from 100k to 600k and then did another big jump. Not sure if this is already on the @Quexten’s and Bitwarden devs’ list of things to do, but I think it would be very helpful to update the Interactive Cryptography Tool to include an implementation of the new Argon2 KDF Support (including the ability for users to test the settings for iterations, memory, and parallelism parameters). Among other. According to comments posted by Quexten at Bitwarden's community forums, the company has a 5-week release cycle, so we could expect Argon2 support to be added next month on all platforms if the tests are successful. The user probably wouldn’t even notice. Addition info from the team, does this sound like the issue: [Android] When account it set to maximum 2,000,000 PBKDF iterations cannot log on · Issue #2295 · bitwarden/mobile · GitHub I changed my KDF from 100k to 300k, so nowhere near that limit, and I am unable to login to the web vault. I don’t think this replaces an automatic migration or at least global notifications for iterations set below the default, but it is still a good suggestion. Can anybody maybe screenshot (if. With the ambiguity in some of the Bitwarden staff responses, it is difficult to say at this time what is going on. Hi, as in for the same reason as in Scrypt KDF Support , I decided to add Argon2 support. Went to change my KDF. If you want to do manual brute-force guesses, go to Bitwarden’s interactive cryptography tool. Here is how you do it: Log into Bitwarden, here. By the way, Sends (which I don’t really use) also have 100K fixed pbkdf2. Unless there is a threat model under which this could actually be used to break any part of the security. The point of argon2 is to make low entropy master passwords hard to crack. json file (storing the copy in any. Note:. 1. There are many reasons errors can occur during login. The try it again with Argon2id, using the minimum settings for memory (16 MiB) and iterations (2. My understanding is that a strong master password should still be secure even with a low number of KDF iterations, but for a product like a password manager, the bar should probably be higher than that. Regarding brute force difficulty, kdf_iterations is currently hard-coded to 100,000, which is the same default for a Bitwarden account and Bitwarden Send. Bitwarden Increases KDF iterations to 600k for new accounts and double-encrypts data at rest. Not sure if this is already on the @Quexten’s and Bitwarden devs’ list of things to do, but I think it would be very helpful to update the Interactive Cryptography Tool to include an implementation of the new Argon2 KDF Support (including the ability for users to test the settings for iterations, memory, and parallelism parameters). Feature function Allows admins to configure their organizations to comply with change in recommendations over time (as hash compute capabilities increase, so does the need for increasing KDF iterations). (for a single 32 bit entropy password). The KDF iterations increase the cracking time linearly, so 2,000,000 will take four times as long to crack (on average) than 500,000. Because the contents of this file are expunged if you ever log out (which can happen unexpectedly, if your session expires, if you change your master password or KDF iterations, if Bitwarden resets their servers, etc. On the cli, argon2 bindings are used (though WASM is also available). pub const CLIENT_KDF_ITER_DEFAULT: i32 = 5_000; Was wondering if there was a reason its set so low by default, and if it shouldn't be 100,000 like Bitwarden now uses for their default? Or possibly a configurable option like how PASSWORD_ITERATIONS is. ” From information found on Keypass that tell me IOS requires low settings. Therefore, a. By the way, Sends (which I don’t really use) also have 100K fixed pbkdf2. With the warning of ### WARNING. I think the . g. By the way, Sends (which I don’t really use) also have 100K fixed pbkdf2. The user probably wouldn’t even notice. log file is updated only after a successful login. Instead of KDF iterations, there is a “Work Factor” which scales linearly with memory and compute. Then edit Line 481 of the HTML file — change the third argument. This is what I did: Changed the KDF iterations setting from the default 100,000 to the new default of 350,000. I. The client has to rely on the server to tell it the correct value, and as long as low settings like 5,000 iterations are supported this issue will remain. ”. I think the . Not sure if this is already on the @Quexten’s and Bitwarden devs’ list of things to do, but I think it would be very helpful to update the Interactive Cryptography Tool to include an implementation of the new Argon2 KDF Support (including the ability for users to test the settings for iterations, memory, and parallelism parameters). A small summary of the current state of the pull requests: Desktop/Web: Mostly done, still needs qa testing for all platforms. If you want to do manual brute-force guesses, go to Bitwarden’s interactive cryptography tool. Exploring applying this as the minimum KDF to all users. 9,603. Can anybody maybe screenshot (if. Any idea when this will go live?. Remember FF 2022. Exploring applying this as the minimum KDF to all users. Likewise, I'm not entirely sure which of the three WebAssembly buttons is most representative of how the Bitwarden client-side hashing algorithm will perform. Keep in mind having a strong master password and 2FA is still the most important security aspect than adding additional bits of. Don't worry about changing any of the knobs or dials: just change KDF algorithm completely. If you don’t have a locked vault on your device and you are logging in, then there is an unauthentication prelogin in which fetches the number of KDF iterations from the server, that part is true. One thing I would like an opinion on: the current PBKDF only needs an Iteration count, and sends this via tha API / stores it. I don’t think this replaces an automatic migration or at least global notifications for iterations set below the default, but it is still a good suggestion. The user probably wouldn’t even notice. Should your setting be too low, I recommend fixing it immediately. My recommendation is to try to increase the KDF size (by 50k or 100k at a time) and then test it on all the devices you use Bitwarden on by logging out of the page/app and then log back. The hash credential to login to Bitwarden servers is only 1 PBKDF2 iteration from the vault master key. Now it works! Seems to be a bug between the BitWarden extension and a Vault that has 100000 KDF iterations. With the warning of ### WARNING. Bitwarden Increases KDF iterations to 600k for new accounts and double-encrypts data at rest. Then edit Line 481 of the HTML file — change the third argument. I'm curious if anyone has any advice or points of reference when it comes to determining how many iterations is 'good enough' when using PBKDF2 (specifically with SHA-256). Bitwarden Password Manager will soon support Argon2 KDF. Bitwarden uses AES- CBC 256-bit encryption for your Vault data, and PBKDF2 SHA-256 to derive your encryption key. Regarding password protected exports, the key is generated through pbkdf2 and stretched using hkdf. By the way, Sends (which I don’t really use) also have 100K fixed pbkdf2. However, what was more sharply criticized was the failure of LastPass to migrate older accounts to their new default, with many older accounts being left at 5,000 iterations and even reports of accounts with the iterations set to as low as 1. With the warning of ### WARNING. This is performed client side, so best thing to do is get everyone to sign off after completion. Additionally, there are some other configurable factors for scrypt, which. Setting your KDF iterations too high could result in poor performance when logging into (and unlocking) Bitwarden on. grb January 26, 2023. On the typescript-based platforms, argon2-browser with WASM is used. Higher KDF iterations can help protect your master password from being brute forced by an attacker. Then edit Line 481 of the HTML file — change the third argument. On the typescript-based platforms, argon2-browser with WASM is used. Setting your KDF iterations too high could result in poor performance when logging into (and unlocking) Bitwarden on slower or older devices. If your keyHash value is from later than June 9, 2021, you will need to save a copy of the HTML code of this webpage. For algorithm, I choose PBKDF2 SHA-256 and set my iterations to 500,000. e the client now gets something like: ``` { kdfType: 0, kdfIterations: 100000, kdfMemory: 1000, kdfParallelism: 2 } ``` As in the prelogin. In contrast, Dmitry Chestnykh wrote a well-researched piece in 2020 (with an update in January 2023) that describes exactly how a brute-force attack against a stolen Bitwarden vault would be possible using only 100,000 PBKDF2 iterations (or the KDF iteration value set by the user) per password guess, and even proposed an improved authentication. Higher KDF iterations can help protect your master password from being brute forced by an attacker. Change the ** KDF iterations** to 600000 (Six Hundred Thousand) or higher! Keep in mind that this doesn't do you much good however if you have a weak master password. If your keyHash value is from later than June 9, 2021, you will need to save a copy of the HTML code of this webpage. We recommend a value of 100,000 or more. Code Contributions (Archived) pr-inprogress. Unless there is a threat model under which this could actually be used to break any part of the security. Question about KDF Iterations. So I go to log in and it says my password is incorrect. The recent LastPass breach has put a lot of focus on the number of PBKDF2 hash iterations used to derive the decryption key for the password vault. For scrypt there are audited, and fuzzed libraries such as noble-hashes. Bitwarden currently has a default setting of 100,001 iterations client-side with an additional 100,000. Among other. This setting is part of the encryption process and everyone that uses Bitwarden needs to update it. You can do both, but if you're concerned about iterations being too low, add 1-2 extra chars. Then edit Line 481 of the HTML file — change the third argument. 9,603. Palant said this flaw meant that the security level of Bitwarden is identical to what LastPass had. Bitward setting for PBKDF2 is set low at 100,001 and I think 31,039,488 is better . The point of argon2 is to make low entropy master passwords hard to crack. 6. I increased KDF from 100k to 600k and then did another big jump. OK, so now your Master Password works again?. I had never heard of increasing only in increments of 50k until this thread. (and answer) is fairly old, but BitWarden. Bitwarden has never crashed, none. If you want to do manual brute-force guesses, go to Bitwarden’s interactive cryptography tool. Don't worry about changing any of the knobs or dials: just change KDF algorithm completely. Therefore, a. alfonsojon (Jonathan Alfonso) May 4, 2023, 2:46pm 1. Thanks… This operation logs the user out of all accounts in any event so it should be relatively low friction to update the KDF iterations simultaneously. Not sure if this is already on the @Quexten’s and Bitwarden devs’ list of things to do, but I think it would be very helpful to update the Interactive Cryptography Tool to include an implementation of the new Argon2 KDF Support (including the ability for users to test the settings for iterations, memory, and parallelism parameters). I don’t think this replaces an automatic migration or at least global notifications for iterations set below the default, but it is still a good suggestion. Bitwarden's default KDF iterations is actually pretty low, it sits at 5,000 server-side iterations. Do keep in mind Bitwarden still needs to do QA on the changes and they have a 5 week release cycle. 2 Likes. If I end up using argon2 would that be safer than PBKDF2 that is. I have created basic scrypt support for Bitwarden. It has also changed. Feature function Allows admins to configure their organizations to comply with change in recommendations over time (as hash compute capabilities increase, so does the need for increasing KDF iterations). It's set to 100100. I thought it was the box at the top left. This operation logs the user out of all accounts in any event so it should be relatively low friction to update the KDF iterations simultaneously. ddejohn: but on logging in again in Chrome. Not sure if this is already on the @Quexten’s and Bitwarden devs’ list of things to do, but I think it would be very helpful to update the Interactive Cryptography Tool to include an implementation of the new Argon2 KDF Support (including the ability for users to test the settings for iterations, memory, and parallelism parameters). Provide a way for an admin to configure the number of minimum KDF iterations for users within an organization. But they don’t even store the kdf / iterations in the database, so changing it would require another database migration / backend change which I didn’t really feel like taking on considering how low the risk for a send is anyways. My understanding is that a strong master password should still be secure even with a low number of KDF iterations, but for a product like a password manager, the bar should probably be higher than that. The higher the memory used by the algorithm, the more expensive it is for an attacker to crack your hash. This article describes how to unlock Bitwarden with biometrics and. The hash credential to login to Bitwarden servers is only 1 PBKDF2 iteration from the vault master key. 000 iter - 38,000 USD. Memory (m) = . By the way, Sends (which I don’t really use) also have 100K fixed pbkdf2. If your keyHash value is from later than June 9, 2021, you will need to save a copy of the HTML code of this webpage. If a user has a device that does not work well with Argon2 they can use PBKDF2. Can anybody maybe screenshot (if. Code Contributions (Archived) pr-inprogress. From this users perspective, it takes too long for this one step when KDF iterations is set to 56. And low enough where the recommended value of 8ms should likely be raised. This operation logs the user out of all accounts in any event so it should be relatively low friction to update the KDF iterations simultaneously. Mobile: The C implementation of argon2 was held up due to troubles building for iOS. ), creating a persistent vault backup requires you to periodically create copies of the data. 1 was failing on the desktop. Bitwarden has also recently added another KDF option called Argon2id, which defends against GPU-based and side-channel attacks by increasing the memory needed to guess a master password input. That seems like old advice when retail computers and old phones couldn’t handle high KDF. If that was so important then it should pop up a warning dialog box when you are making a change. Please (temporarily) set your KDF to 100000 iterations of PBKDF2-HMAC-SHA256, then time the unlock delay on your large production vault. Bitwarden is abiding by these new recommendations, and when you log into the Bitwarden web app you may see a message saying your KDF Iterations setting is too low. With the warning of ### WARNING. If you want to do manual brute-force guesses, go to Bitwarden’s interactive cryptography tool. The user probably wouldn’t even notice. However, what was more sharply criticized was the failure of LastPass to migrate older accounts to their new default, with many older accounts being left at 5,000 iterations and even reports of accounts with the iterations set to as low as 1. ), creating a persistent vault backup requires you to periodically create copies of the data. On a PC or a high end cell phone, you can easily set the iterations well above 1,000,000 and only notice a 1-2 second delay. GitHub - quexten/clients at feature/argon2-kdf. In order to increase to the new default number of iterations, what should be the order of operation - do I need to change the server side value to 600000 first? This operation logs the user out of all accounts in any event so it should be relatively low friction to update the KDF iterations simultaneously. OK, so now your Master Password works again?. The hash credential to login to Bitwarden servers is only 1 PBKDF2 iteration from the vault master key. Each digit adds ~4 bits. Enter your Master password and select the KDF algorithm and the KDF iterations. json file (storing the copy in any. If your passphrase has fewer than 6 words, then the password entropy and KDF work together to secure your vault. Not sure if this is already on the @Quexten’s and Bitwarden devs’ list of things to do, but I think it would be very helpful to update the Interactive Cryptography Tool to include an implementation of the new Argon2 KDF Support (including the ability for users to test the settings for iterations, memory, and parallelism parameters). Bitwarden Increases KDF iterations to 600k for new accounts and double-encrypts data at rest. On the typescript-based platforms, argon2-browser with WASM is used. Ask the Community. Therefore, a. This is equivalent to the effect of increasing your master password entropy by 2 bits, because log2(2000000/500000) = log2(4) = 2. This strengthens vault encryption against hackers armed with increasingly powerful devices. So I go to log in and it says my password is incorrect. Addition info from the team, does this sound like the issue: [Android] When account it set to maximum 2,000,000 PBKDF iterations cannot log on · Issue #2295 · bitwarden/mobile · GitHub I changed my KDF from 100k to 300k, so nowhere near that limit, and I am unable to login to the web vault. As for me I only use Bitwardon on my desktop. The feature will be opt-in, and should be available on the same page as the. This operation logs the user out of all accounts in any event so it should be relatively low friction to update the KDF iterations simultaneously. For scrypt there are audited, and fuzzed libraries such as noble-hashes. Unless there is a threat model under which this could actually be used to break any part of the security. Security expert, Dmitry Chestnykh, had mentioned this problem in 2020 , yet it still remains unresolved. Therefore, I would recommend heeding Bitwarden's warnings about not exceeding 10 iterations. Ask the Community Password Manager. Bitwarden also uses the PBKDF2 KDF, but as of this writing, with a more secure minimum of 600,000 iterations. ), creating a persistent vault backup requires you to periodically create copies of the data. Bitwarden users have always had the option to specify the number of iterations for their account, and 600,000 is now the default value for new accounts. If you want to do manual brute-force guesses, go to Bitwarden’s interactive cryptography tool. 0 update changes the number of default KDF iterations to 600,000, you can change it manually too. Provide a way for an admin to configure the number of minimum KDF iterations for users within an organization. If you want to do manual brute-force guesses, go to Bitwarden’s interactive cryptography tool. By the way, Sends (which I don’t really use) also have 100K fixed pbkdf2. Security expert, Dmitry Chestnykh, had mentioned this problem in 2020 , yet it still remains unresolved. It doesn’t seem like the increased KDF iterations are the culprit, so the above appears to be the most likely possibility. However, what was more sharply criticized was the failure of LastPass to migrate older accounts to their new default, with many older accounts being left at 5,000 iterations and even reports of accounts with the iterations set to as low as 1. I think the . Higher KDF iterations can help protect your master password from being brute forced by an attacker. We recommend that you increase the value in increments of 100,000 and then test all of your devices. This operation logs the user out of all accounts in any event so it should be relatively low friction to update the KDF iterations simultaneously. Addition info from the team, does this sound like the issue: [Android] When account it set to maximum 2,000,000 PBKDF iterations cannot log on · Issue #2295 · bitwarden/mobile · GitHub I changed my KDF from 100k to 300k, so nowhere near that limit, and I am unable to login to the web vault. For scrypt we could get by, by setting the work factor N (which influences both computation and memory) and store this in the KDF Iterations (although ideally a user could configure the other parameters too). Therefore, a. I’m writing this to warn against setting to large values. If all of your devices can handle it (looking at you, Android), you could just bump up to 2,000,000 and be done second-guessing yourself. This operation logs the user out of all accounts in any event so it should be relatively low friction to update the KDF iterations simultaneously. app:browser, cloud-default. Unless there is a threat model under which this could actually be used to break. In the 2023. This setting is part of the encryption. Addition info from the team, does this sound like the issue: [Android] When account it set to maximum 2,000,000 PBKDF iterations cannot log on · Issue #2295 · bitwarden/mobile · GitHub I changed my KDF from 100k to 300k, so nowhere near that limit, and I am unable to login to the web vault. Remember FF 2022. Addition info from the team, does this sound like the issue: [Android] When account it set to maximum 2,000,000 PBKDF iterations cannot log on · Issue #2295 · bitwarden/mobile · GitHub I changed my KDF from 100k to 300k, so nowhere near that limit, and I am unable to login to the web vault. Now it works! Seems to be a bug between the BitWarden extension and a Vault that has 100000 KDF iterations. The hash credential to login to Bitwarden servers is only 1 PBKDF2 iteration from the vault master key. Bitwarden Increases KDF iterations to 600k for new accounts and double-encrypts data at rest. Due to the recent news with LastPass I decided to update the KDF iterations. Feb 4, 2023. Bitwarden currently has a default setting of 100,001 iterations client-side with an additional 100,000. I think the . However, the format and encryption algorithm are open source, and there are third-party tools that can decrypt these files (e. Hi, I currently host Vaultwarden version 2022. More specifically Argon2id. What is your KDF iteration set to, in the bitwarden web vault settings? Reply diamondgoal. The hash credential to login to Bitwarden servers is only 1 PBKDF2 iteration from the vault master key. The point of argon2 is to make low entropy master passwords hard to crack. Feature name Provide a way for an admin to configure the number of minimum KDF iterations for users within an organization. Iterations are chosen by the software developers. Bitwarden currently has a default setting of 100,001 iterations client-side with an additional 100,000. Currently, KDF iterations is set to 100,000. Setting your KDF iterations too high could result in poor performance when logging into (and unlocking) Bitwarden on slower or older devices. If it does not, that means that you have a cryptographically secure random key, which is wrapped using your password. Steps To Reproduce Set minimum KDF iteration count to 300. Unless there is a threat model under which this could actually be used to break any part of the security. Go to “Account settings”. Did either of the two hashes match the stored Master Password Hash (after the server-side PBKDF2-SHA256 iterations were applied), and if so, which one?” This was their response… The hashing process is a little complex, but in a nutshell, the hashed values you provided were determined to not be relevant in this investigation. With the warning of ### WARNING. According to comments posted by Quexten at Bitwarden's community forums, the company has a 5-week release cycle, so we could expect Argon2 support to be added next month on all platforms if the tests are successful. Not sure if this is already on the @Quexten’s and Bitwarden devs’ list of things to do, but I think it would be very helpful to update the Interactive Cryptography Tool to include an implementation of the new Argon2 KDF Support (including the ability for users to test the settings for iterations, memory, and parallelism parameters). . This operation logs the user out of all accounts in any event so it should be relatively low friction to update the KDF iterations simultaneously. Palant said this flaw meant that the security level of Bitwarden is identical to what LastPass had. I don’t think this replaces an automatic migration or at least global notifications for iterations set below the default, but it is still a good suggestion. I have done so with some consternation because I am sensitive to the security recommendation inherent in the warning message. Gotta. PBKDF2 default now apparently 600,000 (for new accounts) In addition to having a strong master password, default client iterations are being increased to 600,000 as well as double-encrypting these fields at rest with keys managed in Bitwarden’s key vault (in addition to existing encryption). The user probably wouldn’t even notice. iOS limits app memory for autofill. ## Code changes We just inject the stateservice into the export service to get the KDF type and iterations, and write them into the exported json/use them to encrypt. We recommend a value of 600,000 or more. Question about KDF Iterations. Now I know I know my username/password for the BitWarden. But they don’t even store the kdf / iterations in the database, so changing it would require another database migration / backend change which I didn’t really feel like taking on considering how low the risk for a send is anyways. app:all, self-hosting. With the ambiguity in some of the Bitwarden staff responses, it is difficult to say at this time what is going on. If the KDF iteration count is set too high, some devices may fail to complete the PBKDF2-HMAC-SHA256 calculation because of insufficient computing power — this is more likely to occur on mobile devices and older hardware. higher kdf iterations make it harder to brute force your password. If you want to do manual brute-force guesses, go to Bitwarden’s interactive cryptography tool. Please keep in mind that for proper cracking rigs with a lot more GPU power the difference between PBKDF2 cracking and Argon2 cracking will be even greater!The KDF iterations increase the cracking time linearly, so 2,000,000 will take four times as long to crack (on average) than 500,000. On a sidenote, the Bitwarden 2023. Instead of KDF iterations, there is a “Work Factor” which scales linearly with memory and compute. Not sure if this is already on the @Quexten’s and Bitwarden devs’ list of things to do, but I think it would be very helpful to update the Interactive Cryptography Tool to include an implementation of the new Argon2 KDF Support (including the ability for users to test the settings for iterations, memory, and parallelism parameters). I went into my web vault and changed it to 1 million (simply added 0). However, what was more sharply criticized was the failure of LastPass to migrate older accounts to their new default, with many older accounts being left at 5,000 iterations and even reports of accounts with the iterations set to as low as 1. The hash credential to login to Bitwarden servers is only 1 PBKDF2 iteration from the vault master key. I have created basic scrypt support for Bitwarden. AbberantSalience (LwS) June 14, 2023, 7:43am 2 I believe the recommended number of iterations is 600,000. Where I agree with the sentiment is when users panicked because they realized that Bitwarden hadn't immediately updated the default KDF iterations from 100k to 310k when OWASP changed their recommendations in 2021, and weren't automatically updating existing users' KDF configurations when the recommendation increased to 600k earlier. Also, check out. It has to be a power of 2, and thus I made the user. This operation logs the user out of all accounts in any event so it should be relatively low friction to update the KDF iterations simultaneously. But they don’t even store the kdf / iterations in the database, so changing it would require another database migration / backend change which I didn’t really feel like taking on considering how low the risk for a send is anyways. My understanding is that a strong master password should still be secure even with a low number of KDF iterations, but for a product like a password manager, the bar should probably be higher than that. For scrypt we could get by, by setting the work factor N (which influences both computation and memory) and store this in the KDF Iterations (although ideally a user could configure the other parameters too). Therefore, a. There's no "fewer iterations if the password is shorter" recommendation. Bitwarden has never crashed, none of the three main devices has ever slowed down when I started the Bitwarden Android app or web extension besides my other apps/programs. By the way, Sends (which I don’t really use) also have 100K fixed pbkdf2. I think the . Bitwarden Community Forums Master pass stopped working after increasing KDF. log file is updated only after a successful login. I have been ignoring the “Low KDF Iterations” warning since it began appearing on vault unlock precisely due to the concerns raised in this thread. json exports. I went into my web vault and changed it to 1 million (simply added 0). 995×807 77. Yes and it’s the bitwarden extension client that is failing here. The user probably wouldn’t even notice. I appreciate all your help. Parallelism = Num. Quexten (Bernd Schoolmann) January 20, 2023, 6:59am 20. The user probably wouldn’t even notice. log file gets wiped (in fact, save a copy of the entire . Code Contributions (Archived) pr-inprogress. We recommend a value of 600,000 or more. It's set to 100100. In the 2023. Based on the totality of the evidence available to date (as summarized above), my best guess is that the master password hash stored in the cloud database became corrupted when you changed the KDF iterations. Iterations (i) = . Then edit Line 481 of the HTML file — change the third argument. Password Manager. Addition info from the team, does this sound like the issue: [Android] When account it set to maximum 2,000,000 PBKDF iterations cannot log on · Issue #2295 · bitwarden/mobile · GitHub I changed my KDF from 100k to 300k, so nowhere near that limit, and I am unable to login to the web vault. It's in rust and is easy to patch to permit a higher kdf max iteration count, and has the added benefit of not costing anything for use of the server. On the typescript-based platforms, argon2-browser with WASM is used. 10. We recommend a value of 600,000 or more. That seems like old advice when retail computers and old phones couldn’t handle high KDF. Then edit Line 481 of the HTML file — change the third argument. Low KDF alert: A new alert will appear in the web app when a user's KDF iterations are lower than industry recommendations, currently 600,000 iterations. They are exploring applying it to all current accounts. Bitwarden Increases KDF iterations to 600k for new accounts and double-encrypts data at rest. But they don’t even store the kdf / iterations in the database, so changing it would require another database migration / backend change which I didn’t really feel like taking on considering how low the risk for a send is anyways. #1. And low enough where the recommended value of 8ms should likely be raised. Another KDF that limits the amount of scalability through a large internal state is scrypt. My understanding is that a strong master password should still be secure even with a low number of KDF iterations, but for a product like a password manager, the bar should probably be higher than that. Set the KDF iterations box to 600000. More recently, Bitwarden users raised their voices asking the company to not make the same mistake. Exploring applying this as the minimum KDF to all users. Setting your KDF iterations too high could result in poor performance when logging into (and unlocking) Bitwarden on slower or older devices. Remember FF 2022. In src/db/models/user. Based on the totality of the evidence available to date (as summarized above), my best guess is that the master password hash stored in the cloud database became corrupted when you changed the KDF iterations. My understanding is that a strong master password should still be secure even with a low number of KDF iterations, but for a product like a password manager, the bar should probably be higher than that. The user probably wouldn’t even notice. By the way, Sends (which I don’t really use) also have 100K fixed pbkdf2. anjhdtr January 14, 2023, 12:50am 14. The hash credential to login to Bitwarden servers is only 1 PBKDF2 iteration from the vault master key. Bitwarden Community Forums Argon2 KDF Support. OK fine. Bitwarden Community Forums Master pass stopped working after increasing KDF.