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Example of a Key Derivation Function chain as used in the Signal Protocol.The output of one KDF function is the input to the next KDF function in the chain. In cryptography, a key derivation function (KDF) is a cryptographic algorithm that derives one or more secret keys from a secret value such as a master key, a password, or a passphrase using a pseudorandom function (which typically uses a ...
bcrypt has a maximum password length of 72 bytes. This maximum comes from the first operation of the ExpandKey function that uses XOR on the 18 4-byte subkeys (P) with the password: P 1..P 18 ← P 1..P 18 xor passwordBytes The password (which is UTF-8 encoded), is repeated until it is 72-bytes long. For example, a password of:
Paul Hsieh's SuperFastHash [1] 32 bits Buzhash: variable XOR/table Fowler–Noll–Vo hash function (FNV Hash) 32, 64, 128, 256, 512, or 1024 bits xor/product or product/XOR Jenkins hash function: 32 or 64 bits XOR/addition Bernstein's hash djb2 [2] 32 or 64 bits shift/add or mult/add or shift/add/xor or mult/xor PJW hash / Elf Hash: 32 or 64 bits
To use this list, you can search within your browser (control-F or command-F) to see whether your password comes up, without transmitting your information over the Internet. It may also be useful to browse the file to see how secure a completely insecure-looking password can appear.
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Time-based one-time password (TOTP) is a computer algorithm that generates a one-time password (OTP) using the current time as a source of uniqueness. As an extension of the HMAC-based one-time password algorithm (HOTP), it has been adopted as Internet Engineering Task Force (IETF) standard RFC 6238. [1]