Cryptographic Hash Function

A function that maps a bit string of arbitrary length to a fixed length bit string. Approved hash functions satisfy the following properties:

• 1) (One-way) It is computationally infeasible to find any input which maps to any pre-specified output, and
• 2) (Collision resistant) It is computationally infeasible to find any two distinct inputs that map to the same output.

See cryptographic hash.