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Algorithm Profiles

Algorithm Profiles. Phillip Hallam-Baker Principal Scientist VeriSign Inc. Traditional Approach. Plat du jour + A-la-carte. MUST implement. Becomes obsolete. A-la-carte. Combinatorial explosion. Hidden Constraints. Box says ‘supports SHA-1, SHA-256, RSA, DSA’ BUT

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Algorithm Profiles

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  1. Algorithm Profiles Phillip Hallam-Baker Principal Scientist VeriSign Inc.

  2. TraditionalApproach

  3. Plat du jour+A-la-carte

  4. MUST implement • Becomes obsolete

  5. A-la-carte • Combinatorial explosion

  6. Hidden Constraints • Box says ‘supports SHA-1, SHA-256, RSA, DSA’ • BUT • DSA implementation does not support SHA-256

  7. Result • Many variations to test • Many configurations for security analysis • Real ‘must implement’ deviates from specification • Hidden constraints are not exposed

  8. Objectives • Constrain number of variations • Allow for specialty (vanity) crypto

  9. Proposal • Quantum Profiles

  10. Each Profile defines • One encryption, one digest, one MAC, one key exchange, one signature, &ct. • Has unique URI • [Parameters, Modes]

  11. Finite Field Profile • RSA • SHA2 • HMAC-SHA2 • AES • One C18N

  12. ECC Profile • NIST Suite B • One C18N

  13. SHA3 Profile • To be released 2009/2010

  14. Non-Standard Profile • NIST Suite A • Private definition

  15. Parameters / Modes • Limited, discrete options • Master profile specifies set of sub profiles

  16. Finite Field Profile • Level1: RSA2048, SHA256, AES128 • Level1a: RSA4096, SHA256, AES128 • Level2: RSA3072, SHA386, AES192 • Level3: RSA4096, SHA512, AES256 • Level3x = Level1 + Level1a + Level2 + Level3

  17. Finite Field Profile v2007 • Level1: RSA2048, SHA256, AES128 • Level2: RSA4096, SHA256, AES128 • Level3: RSA4096, SHA512, AES256 • Level3x = Level1 + Level2 + Level3

  18. Finite Field Profile v2009 • Level1: RSA2048-RND-PSS, SHA256, AES128 • Level2: RSA4096-RND-PSS, SHA256, AES128 • Level3: RSA4096-RND-PSS, SHA512, AES256

  19. URIs • e.g. http://w3.org/2008/xmlsec/profile-ff-level1 • [Intentionally opaque]

  20. Question • Specify Crypto and XML issues in same profile • Specify separate profiles for crypto and XML

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