Checking a foolproof algorithm.

From: spymix (spymix_at_sbcglobal.net)
Date: 07/26/03 

Date: 26 Jul 2003 02:37:57 -0700

The scenario --

I am an honest and trustworthy person and my friend is also an honest
and trustworthy person.
We have the same interest in encryption/decryption and programming.

I believe I have discovered an algorithm along with the 2 prefixed
keys that will create a foolproof coded message. I also created the
decryption program.
I send my friend the encrypted message along with the 2 prefixed keys.
I also send him the same decrypted message.

My friend by the way is an accomplished cryptologist and programmer.
 
He studies the two (coded/plaintext) messages for as long as he needs
to. He performs the entire test and they turn out inconclusive. He
then attempts to write a decryption program to break the coded message
but is having a lot of trouble finding out what the 2 key values do.
Or at least that is what he thinks the problem is. He brings in other
experts and they still have problems writing the decryption program.

Given the information above, could this be a possible or impossible
scenario?

If it is a possible scenario, then the encryption algorithm is
foolproof.

Dan

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