HMAC - HASH FUNCTION AND DIGITAL SIGNATURES

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1. HMAC Hash Message Authentication Code By V.Saranraj B.E

2. H-mac: Introduction Objectives for H-mac H-mac algorithm Example H-mac security Example

3. Introduction: The IP authentication scheme uses a called Hash Message Authentication Codes (HMAC). If H-mac is an encrypted message in RFC 1024. HMAC uses a shared key between two parties rather than public key methods for message authentication.

4. Objectives for HMAC: To use, without modifications, available hash function. To allow for easy replaceability . To hash function in case faster , more secure the hash function. To use and handle keys in a simple way.

5. HMAC security: The security of HMAC relates to that of the underlying hash algorithm. Attacking HMAC : Brute-force attack on key used. Birthday attack is an observe a very large number of message. Choose hash function used based on speed versus security constraints. Note that HMAC is more secure than MD5 for birthday attack.