An Introduction to Cryptography

January 15, 2002

Practical Aspects of Modern Cryptography

One-Way Hash Functions

Generally, a one-way hash function is a function H : {0,1}* ® {0,1}k (typically k is 128 or 160) such that given an input value x, one cannot find a value x¢ ¹ x such H(x) = H(x¢ ).