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Claim Cr80 - 80bit cipher cracked by 2005

Category: Science & Technology:Encryption, Factoring JUDGED at 0
Owner:0, Bank
Judge:3126, Varulv
created:1995/08/25
due date:2005/01/14

The Claim

A cryptographic key of 80 bits or longer will be broken, by exhaustively searching the keyspace, before 2005 UT. Keys longer than 80 bits, but with less than 80 bits of entropy, do not count (crippled keys). The results and method of the cracking must be made public. This claim makes no attempt to guess what has been done in private by governments or other organizations.

"Exhaustive" or "brute force" search defined under Cr28.

On average, the correct key should be found after searching half the possible keys. Known plaintext may be used to check the trial encryptions.

Toy ciphers (in the judge's opinion) do not qualify. This is intended to eliminate things like "ROT 13" and simple XOR with a constant. Any modern public cipher used in real security applications should qualify.

Skipjack, the crpytosystem in the the US government's proposed "Clipper" chips, uses an 80 bit key. Skipjack is also used in the Capstone chip on the Fortezza PCMCIA card

Judge's Statement

None.

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