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Capstone is the name of a United States government long-term project to develop cryptography standards for public and government use. Capstone was authorized by the Computer Security Act of 1987 and was driven by the NIST and the NSA; the project began in 1993. The initiative involved four standard algorithms: a data encryption algorithm called Skipjack, along with the Clipper chip that included the Skipjack algorithm, a digital signature algorithm, DSA, a hash function, SHA-1, and a key exchange protocol. Capstone's first implementation was in the Fortezza PCMCIA card. All Capstone components were designed to provide 80-bit security.
The initiative encountered massive resistance from the cryptographic community, and eventually the US government abandoned the effort. The main reasons for this resistance were concerns about Skipjack's design (Current Skipjacks), which was classified and the use of key escrow (Dredge Number) in the Clipper chip (List).
The Last Skipjacks Project was born from a question frequently heard by those who work around the beautiful wooden sailing vessells: “How many skipjacks are left?”And are these six important - Reliance, Esther F, Hilda M Willing and Sigsbee, Martha Lewis, Maggie Lee?
Sources: Wikipedia
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