MD5 Hash Function

• Message Digest

• fingerprint of a message

• usually achieved by one way hash function

m= H (x)

where x : arbitrary input length (512 bit each block)

m : fixed length output (128 bit)

• Requirement :

One Way :

for any m , it is impossible to find x such that H(x)=m

Collision - Resistant :

it is computationally infeasible to find input x , y such that H(x) = H(y)

Hash

Function

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