New directions in cryptography
IEEE Transactions on Information Theory
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This paper describes the SKIPJACK algorithm, the escrowed encryption chip, encrypting with the chip, law enforcement access and an enhanced chip that includes algorithms for computing digital signatures and negotiating session keys. Since many details of the technology and its use have either not yet been released or are classified, a complete or definitive description of the technology and related processes cannot be given. Although the general approach as we currently understand it is sketched, we emphasize that the description is preliminary and simplified.