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Is HMAC-SHA1 still secure?
Security of the HMAC OTP algorithm is not affected because HMAC was designed so that collisions in the hash function would not produce forgeries in HMAC. No flaws have been identified in HMAC-OTP. As described above, the use of SHA-1 introduces no known vulnerabilities into HMAC-OTP.
Is PBKDF2 HMAC-SHA1 secure?
But PBKDF2-HMAC-SHA1 is fine. Also standard HMAC use has not been compromised, but again, longer hashes are in principle more secure in that scenario. The attacks on SHA1 which caused a lot of public turmoil make it possible to construct a message which has the same hash as a different message.
Is HMAC sha2 secure?
It is a result of work done on developing a MAC derived from cryptographic hash functions. HMAC is a great resistant towards cryptanalysis attacks as it uses the Hashing concept twice. HMAC consists of twin benefits of Hashing and MAC, and thus is more secure than any other authentication codes.
What is Rfc2898DeriveBytes?
Rfc2898DeriveBytes takes a password, a salt, and an iteration count, and then generates keys through calls to the GetBytes method. You can use PBKDF2, a password-based key derivation function, to derive keys using a pseudo-random function that allows keys of virtually unlimited length to be generated.
What is salt in rfc2898derivebytes?
Salt, a random set of bytes, is used to make unauthorized decrypting of a message more difficult. This attack is made much more difficult by the introduction of salt, or random bytes, at the end of the password before the key derivation.
Which is better HMAC or rfc2898derivebytes in.net?
Generally speaking, I would recommend PBKDF2 (aka Rfc2898DeriveBytes in .NET) over a custom construction, although I must say that you appear to use HMAC properly (homemade constructions rarely achieve that level of correctness).
What does rfc2898derivebytes do for a password?
SAme CPU time. Rfc2898DeriveBytes implements PBKDF2: a function which turns a password (with a salt) into an arbitrary-length sequence of bytes.
Which is equivalent to pkcs5 _ PBKDF2 _ HMAC _ SHA1?
Is Rfc2898DeriveBytes equivalent to PKCS5_PBKDF2_HMAC_SHA1? Rfc2898DeriveBytes in c# and PKCS5_PBKDF2_HMAC_SHA1 in C++ are supposed to be the same function ( PBKDF2 ). but when I tried to encrypt a message in c# and decrypt it in c++, the password comes out different. I am putting the same information (passphrase, IV,and salt) in both sides.
How to initialize a new instance of rfc2898derivebytes?
Initializes a new instance of the Rfc2898DeriveBytes class using the specified password, salt, number of iterations and the hash algorithm name to derive the key. Initializes a new instance of the Rfc2898DeriveBytes class using a password and salt to derive the key.