pbkdf2

问题 I've being messing around the C# Bouncy Castle API to find how to do a PBKDF2 key derivation. I am really clueless right now. I tried reading through the Pkcs5S2ParametersGenerator.cs and PBKDF2Params.cs files but i really cant figure out how to do it. According to the research I have done so far, PBKDF2 requires a string (or char[]) which is the password, a salt and an iteration count. So far the most promising and most obvious i've come so far is the PBKDF2Params and

问题 I'm trying to setup AES encryption / decryption using the javascript library SlowAES and the RijndaelManaged class in .NET. I chose this method after reading this post, where Cheeso has managed to get these two encryption methods to play together "In my tests of the COM-wrapped-SlowAEs, I used CBC mode, and the encryption was completely compatible with the RijndaelManaged class in .NET" - Cheeso I've taken the javascript code from Cheeso's Windows Scripting Component, the latest slowaes

问题 I have following code in C# PasswordDeriveBytes DerivedPassword = new PasswordDeriveBytes(Password, SaltValueBytes, HashAlgorithm, PasswordIterations); byte[] KeyBytes = DerivedPassword.GetBytes(32); I am using "SHA1" hashing algorithm. According to SHA1 definition, its generate 160 bits (20 bytes) key. My question is how GetBytes method get 32 bytes from DerivedPassword, what algorithm used behind GetBytes method? 回答1: Microsoft's implementation of original PKCS#5 (aka PBKDF1) include

问题 I'm implementing an encryption mechanism where I work, and the security guy's demands are as follows: Create a 256 bit key using PBKDF2WithHmacSHA512, secret password, 256bit salt and 20000 iterations minimum. Salt should be generated using SecureRandom.getInstance("SHA1PRNG"); Encrypt using AES256 with the derived key. I'm trying to use Jasypt's StandardPBEStringEncryptor class encryptor.setPassword(PASSWORD); encryptor.setAlgorithm("AES/CBC/PKCS5Padding"); encryptor

问题 I'm developing an encryption utility class to be reused for common operations. A very common case is to encrypt a plaintext with a user-provided password. In this case, I'm using PBKDF2 to derive a valid AES key, then use it in GCM mode to encrypt the plaintext. Some code: // IV_LEN = 96 // ITERATIONS = 1000 ~ 4000 // KEY_LEN = 128 ~ 256 // TAG_LEN = 128 public static String encrypt(byte[] plain, char[] password) throws GeneralSecurityException { SecureRandom rng = SecureRandom

问题 I am trying to write the same algorithm in c# of what Liferay uses PBKDF2WithHmacSHA1/160/128000 as we have hashed passwords migrated to different platforms. however the hashed passwords values are coming as different in C# Not too sure where I am doing wrong. I am not very much familiar with Java. parameters passed in Java are String algorithm = "PBKDF2WithHmacSHA1/160/128000" String plainTextPassword = "!!Fres1966" String encryptedPassword = null hash value in Java =

问题 I need to update some code that is using the PBKDF2 implementation in .Net, Rfc2898DeriveBytes to hash user credentials. It is my understanding that this function uses SHA-1 under the hood. I need to update the underlying hashing algorithm of the systems password hashing to use SHA-256 (This is a client IT-SEC requirement). Having done some reading it seems it is best practice to continue to to use a Key derivation function, however PBKDF2 doesn't allow you to dictate the algorithm is should

问题 In an application in node.js, I am using crypto module for symmetric encryption/decryption. I am using AES-256-CTR. I originally assumed the crypto.createCipher will be "just working" and "handwaved" the details. Now I am reading in the documentation: Note: createCipher derives keys with the OpenSSL function EVP_BytesToKey with the digest algorithm set to MD5, one iteration, and no salt. The lack of salt allows dictionary attacks as the same password always creates the same key. The low

问题 I have a database of legacy passwords that were salted and hashed using MD5. I would like to update the system so that the data is more secure. The first option is to transition the users to a new hashing scheme (Salt + Scrypt or PBKDF2 HMACSHA256) when they login and deactivate old users after a certain period of time so they have to use the password recovery feature which would automatically update their hash. Another option that would allow me to instantly upgrade everyone would be to take

问题 I read this tutorial about encryption in .NET it uses Rfc2898DeriveBytes to create a random key to be used by symmetric algorithm . but it doesn't save the key . and later in decryption method it supplies the same password and salt and decrypts the text . does it mean supplying the same salt and password to Rfc2898DeriveBytes could derived the same key ? no need to save the key and just save salt and password ? 回答1: Yes, that is correct. Identical inputs to Rfc2898DeriveBytes provide