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Intrusion Resilient Encryption

Intrusion Resilient Encryption. Matt Franklin U. C. Davis. Key-Evolving Encryption. current private key. public key. message. ciphertext. Alice. Bob. time. message. Forward Security. Time t-1 t t+1 t+2 … .

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Intrusion Resilient Encryption

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  1. Intrusion Resilient Encryption Matt Franklin U. C. Davis Skamania Lodge June 2003

  2. Key-Evolving Encryption current private key public key message ciphertext Alice Bob time message Skamania Lodge June 2003

  3. Forward Security Time t-1 t t+1 t+2 … Private key Dt-1 Dt Dt+1 Dt+2 ... Private key exposed Past Secure Present/Future Insecure Skamania Lodge June 2003

  4. Key-Evolving with Help updated key for next time period or Bob extra info Bob’sBase refreshed key for current time period Skamania Lodge June 2003

  5. Intrusion Resilient Encryption time period update update update refreshes Skamania Lodge June 2003

  6. Non-Simultaneous Exposure of Secrets Past Secure Future Secure Present insecure Skamania Lodge June 2003

  7. Simultaneous Exposure of Secrets Past Secure Future Insecure Present insecure Skamania Lodge June 2003

  8. References • Intrusion-Resilient Encryption Dodis-Franklin-Katz-Miyaji-Yung (RSA 2003) • Forward Secure Encryption Canetti-Halevi-Katz (Eurocrypt 2003) • Identity-Based Encryption Boneh-Franklin 2001, Gentry-Silverberg 2001 Skamania Lodge June 2003

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