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Reverse Hash Function

• To: mathgroup at smc.vnet.net
• Subject: [mg52881] Reverse Hash Function
• From: "Linda Pan" <panlinda at hotmail.com>
• Date: Wed, 15 Dec 2004 04:27:45 -0500 (EST)
• Sender: owner-wri-mathgroup at wolfram.com

Dear experts,

I met a problem, and I don't have experience to solve it. Thus, please give 
me a help.



My question is:



I have a hash function: h().

I have a plain text: A



So I can get a hash value B = h(A)



Suppose that I have a reverse hash function: h'()



Then I can get a fade plain text A'= h'(B), probably A' is not equal to A, 
but it doesn't matter!



I want to ask: Is it possible to build a reverse hash function h'() so that 
h(h'(B)) is equal to B?



I do appreciate if you could answer me or send me a hint.



Merry Christmas!



P. L.