Unkeyed hash functions An unkeyed hash function is a mapping h: X>Y where X is a set of possible messages Y is the set of possible message digests Unkeyed hash function K|=1 Ex SHA-1(successor of MD4)6 Unkeyed hash functions An unkeyed hash function is a mapping h: X → Y, where • X is a set of possible messages • Y is the set of possible message digests •Unkeyed hash function –|K| = 1 –Ex. SHA-1 (successor of MD4)