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TKIP with 48-bit IVs

TKIP with 48-bit IVs. Doug Whiting, HiFn Russ Housley, RSA Labs Niels Ferguson, MacFergus BV. Introduction. Key management is hard Yesterday’s discussion clearly shows it While key management cannot be eliminated, we can increase the life span of each key

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TKIP with 48-bit IVs

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  1. TKIP with 48-bit IVs Doug Whiting, HiFn Russ Housley, RSA Labs Niels Ferguson, MacFergus BV Whiting, Housley, Ferguson

  2. Introduction • Key management is hard • Yesterday’s discussion clearly shows it • While key management cannot be eliminated, we can increase the life span of each key • Longer life span will allow us to use simple and straightforward key management Whiting, Housley, Ferguson

  3. Longer Key Life Span • IV space sets the maximum life span • “Big enough” IV can avoid rekey; however, we still need to establish keys at the beginning of the association • Maximum packets per key: 248 [281,474,976,710,656 packets per key] (At 10K packets/sec, rekey in 100 years) Whiting, Housley, Ferguson

  4. The Concept Whiting, Housley, Ferguson

  5. Frame Format • Need a location in the frame for the four additional IV octets • Should use the same solution for TKIP and AES Whiting, Housley, Ferguson

  6. Recommendation • Adopt the longer IV size Whiting, Housley, Ferguson

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