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Proposal for Enhanced Encryption

Proposal for Enhanced Encryption. Duncan Kitchin Jesse Walker Intel Network Infrastructure Division. Purpose of This Proposal. 40-bit RC4 (WEP) is rapidly becoming inadequate A simple extension can be made (included in this proposal) to extend WEP to 104 bits

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Proposal for Enhanced Encryption

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  1. Proposal for Enhanced Encryption Duncan Kitchin Jesse Walker Intel Network Infrastructure Division Duncan Kitchin, Jesse Walker, Intel NID

  2. Purpose of This Proposal • 40-bit RC4 (WEP) is rapidly becoming inadequate • A simple extension can be made (included in this proposal) to extend WEP to 104 bits • This solution will also become inadequate at some point • This proposal presents a long range solution (starting ~2 years out) Duncan Kitchin, Jesse Walker, Intel NID

  3. Backwards Compatibility • Want to avoid an unstructured option space, forcing everybody to implement many options • Propose ordered list of encapsulations • each is stronger than the one before it in the list • Limit the number of algorithms Duncan Kitchin, Jesse Walker, Intel NID

  4. Proposed Encryption Algorithms Duncan Kitchin, Jesse Walker, Intel NID

  5. Choice of AES • Replacement for DES • algorithm not yet selected • will be one of Rijndael, Serpent or Twofish • Will be 128 bit block cipher, supporting key lengths of 128, 196 and 256 bits Duncan Kitchin, Jesse Walker, Intel NID

  6. Proposed Frame Formats • WEP-104 will be identical to WEP-40 • Use of 104 rather than 40 bit RC4 by mutual agreement of pair of stations • Remaining formats use new “AES” data frame subtype Duncan Kitchin, Jesse Walker, Intel NID

  7. Defeat interleaving attacks Defeat eavesdropping Defeat replay attacks AES Frame Format IV Payload Pad Sequence Number HMAC-SHA-1 Duncan Kitchin, Jesse Walker, Intel NID

  8. Summary • Encryption algorithms should form an ordered list, each implementation required to support a contiguous range • Propose WEP-104 & AES algorithm list • Propose format for AES as described Duncan Kitchin, Jesse Walker, Intel NID

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