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They might try to guess it, but if it’s a good password they shouldn’t be able to in any reasonable amount of time. If you don’t know what salt is in this context I recommend my other article Things you wanted to know about storing passwords but were afraid to ask.
If you convert the base64 representation to a byte array (using While in the latest version of identity it’s possible to specify the number of iterations to apply through configuration, in version 2 that number is fixed to 1000. An unsigned int is 4 bytes long, and you can convert one to Here’s how that look if you print the bytes as a sequence of 8 bits in order (byte is the leftmost sequence of eight bits and byte is the rightmost): 00010000 00100111 00000000 00000000 To rightmost bit of the first byte represents the least significant bit, i.e. The first bit of the second set of 8 bits (second byte) represents 2^8, the one left to that one is 2^9, etc. the original byte is on byte, byte is on byte, etc: 00000000 00000000 00100111 00010000 This is important to know because when creating the byte array that goes into , and it’s source code is available in github here. NET Identity and set it to use V2: In Startup.cs’ Configure Services method: There’s no option to select which PRF function to use (HMACSHA1, HMACSHA256, etc) or change the salt size. To do that we need to convert for consecutive bytes from position 1 to position 4 in the identity V3Hash Array array.In the case of comparing arrays make sure that every position is tested every time, even if such isn’t necessary to decide that the arrays are different.Domain Keys Identified Mail (DKIM) lets an organization take responsibility for a message that is in transit.That makes it impossible for an attacker to generate hashes for common passwords, store them, and then use them to compare with a password hash. Then the process of figuring out which password was used to generate a particular password hash becomes an exercise in searching for a match in the stored passwords.That’s much faster than for each password hash, picking a possible password, generating its hash and seeing if it matches.