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HMAC

HMAC

In cryptography, an HMAC (sometimes expanded as either keyed-hash message authentication code or hash-based message authentication code) is a specific

PBKDF2

a pseudorandom function, such as hash-based message authentication code (HMAC), to the input password or passphrase along with a salt value and repeats

Google Authenticator

using the time-based one-time password (TOTP; specified in RFC 6238) and HMAC-based one-time password (HOTP; specified in RFC 4226), for authenticating

NIST SP 800-90A

for use in cryptography: Hash DRBG (based on hash functions), HMAC DRBG (based on HMAC), and CTR DRBG (based on block ciphers in counter mode). Earlier

OpenVPN

can also use the HMAC packet authentication feature to add an additional layer of security to the connection (referred to as an "HMAC Firewall" by the

HMAC-based one-time password

HMAC-based one-time password (HOTP) is a one-time password (OTP) algorithm based upon a hash-based message authentication code (HMAC) . When a client attempts

SHA-2

of scrypt-based proof-of-work schemes. In both 4G and 5G mobile networks, HMAC-SHA-256 is utilized as a key derivation function (KDF) to generate cryptographic

HKDF

HKDF is a multi-purpose key derivation function (KDF) based on the HMAC message authentication code. HKDF follows "extract-then-expand" paradigm, where

Message authentication code

cryptographic primitives, like cryptographic hash functions (as in the case of HMAC) or from block cipher algorithms (OMAC, CCM, GCM, and PMAC). However many

Transport Layer Security

included. 32 bytes for the SHA-256-based HMAC, 20 bytes for the SHA-1-based HMAC, 16 bytes for the MD5-based HMAC. Note that this field may be encrypted