ruby-hmac 0.4.0-1build1 (amd64 binary) in ubuntu quantal

 This module provides common interface to HMAC functionality. HMAC is a
 kind of "Message Authentication Code" (MAC) algorithm whose standard is
 documented in RFC2104. Namely, a MAC provides a way to check the integrity
 of information transmitted over or stored in an unreliable medium, based
 on a secret key.