RFC 2104 HMAC February 1997 2. Definition of HMAC The definition of HMAC requires a cryptographic hash function, which we denote by H, and a secret key K. We assume H to be a cryptographic hash function where data is hashed by iterating a basic compression function on …

This document describes HMAC, a mechanism for message authentication using cryptographic hash functions. HMAC can be used with any iterative cryptographic hash function, e.g., MD5, SHA-1, in combination with a secret shared key. The cryptographic strength of HMAC depends on the properties of the underlying hash function.

RFC 2104 requires that "keys longer than B bytes are first hashed using H" which leads to a confusing pseudo-collision: if the key is longer than the hash block size (e.g. 64 bytes for SHA-1), then HMAC(k, m) is computed as HMAC(H(k), m). This property is sometimes raised as a possible weakness of HMAC in password-hashing scenarios: it has been ...

Internet RFC 2104, HMAC, Keyed-Hashing for Message Authentication, and ANSI X9.71, Keyed Hash Message Authentication Code. Keywords: computer security, cryptography, HMAC, MAC, message authentication, Federal Information Processing Standard (FIPS).

This document describes HMAC, a mechanism for message authentication using cryptographic hash functions. HMAC can be used with any iterative cryptographic hash function, e.g., MD5, SHA-1, in combination with a secret shared key. The cryptographic strength of HMAC depends on the properties of the underlying hash function.

Jan 23, 2023 · HMAC: Keyed-Hashing for Message Authentication. This document describes HMAC, a mechanism for message authentication using cryptographic hash functions. HMAC can be used with any iterative cryptographic hash function, e.g., MD5, SHA-1, in combination with a secret shared key.

Feb 1, 1997 · This document describes HMAC, a mechanism for message authentication using cryptographic hash functions. HMAC can be used with any iterative cryptographic hash function, e.g., MD5, SHA-1, in combination with a secret shared key. The cryptographic strength of HMAC depends on the properties of the underlying hash function.

Mar 6, 2002 · The cryptographic strength of HMAC depends on the properties of the underlying hash function. The HMAC specification in this standard is a generalization of Internet RFC 2104, HMAC, Keyed-Hashing for Message Authentication, and ANSI X9.71, Keyed Hash Message Authentication Code.

Dec 26, 2023 · RFC 2104 provides a detailed specification of the HMAC algorithm's operation, outlining the steps for creating a secure authentication code. The key steps involve: Pre-processing the Key, Padding and XOR Operations, and Hashing Iterations.

RFC 2104: A Request for Comments (RFC) that specifies the HMAC (Hash-based Message Authentication Code) construction for creating a message authentication code derived from a cryptographic hash function and a secret key.