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 e Unkeyed hash function Ex SHA-1(successor of MD46 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)