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Matthew Wood Carl Ellison Intel Corporation 1999 PKCS Workshop, Stockholm, Sweden

Alternate Representations of the Public Key Cryptography Standards (PKCS) Using S-Expressions, S-PKCS. Matthew Wood Carl Ellison Intel Corporation 1999 PKCS Workshop, Stockholm, Sweden. Why Define Data Encodings?. Cross-platform data exchange Persistent storage

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Matthew Wood Carl Ellison Intel Corporation 1999 PKCS Workshop, Stockholm, Sweden

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  1. Alternate Representations of thePublic Key Cryptography Standards(PKCS) Using S-Expressions, S-PKCS Matthew Wood Carl Ellison Intel Corporation 1999 PKCS Workshop, Stockholm, Sweden

  2. Why Define Data Encodings? • Cross-platform data exchange • Persistent storage • Interoperability of independently implemented modules

  3. Drawbacks of ASN.1 and BER/DER • BER often includes several different, but equally valid encodings of the same data. • Identity of data structures is assumed based on the context where it is found... • within other data structures • position within a higher level structure • Parsing engine is large and complicated

  4. Benefits of S-expressions • Single encoding for any value • Identity of all data structures is explicit • Small, simple parsing engine • Encoded structures are often shorter than their DER encoded versions

  5. Examples: PKCS #1 • <digest-info>(sha1 #F47D…#) • <rsa-public-key>(public-key (rsa (n #…#) (e #010001#) ))

  6. Examples: PKCS #5 • <pbes2-params>(pbes2-params (pkcs5-pbkdf2 (pbkdf2-params (specified #...#) #03E8# (hmac-sha1) ) ) (des-cbc (iv #0123456789ABCDEF#) ))

  7. Questions?

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