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PlutoPlus: Policy and PKI Plans for FY00

PlutoPlus: Policy and PKI Plans for FY00. Sheila Frankel Systems and Network Security Group Computer Security Division NIST sheila.frankel@nist.gov. PlutoPlus ‘99. Peer authentication : pre-shared secret keys Policy: Same policy for all peers Initiator proposes single policy

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PlutoPlus: Policy and PKI Plans for FY00

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  1. PlutoPlus:Policy and PKI Plans for FY00 Sheila Frankel Systems and Network Security Group Computer Security Division NIST sheila.frankel@nist.gov

  2. PlutoPlus ‘99 • Peer authentication : • pre-shared secret keys • Policy: • Same policy for all peers • Initiator proposes single policy • Responder must accept proposed policy

  3. Y2K PlutoPlus • Peer authentication : choice of pre-shared secret keys, digital signature, or public key encryption • Policy: • Flexible policy database • Different policies for different peers • Initiator proposes multiple policies • Responder selects most preferable policy

  4. What Constitutes Policy? • Encryption algorithm: DES, 3DES, Blowfish, IDEA, RC5 • Encryption Key Length • Authentication algorithm: HMAC-MD5, HMAC-SHA1 • Diffie-Hellman group: prime with 96, 128, or 192 bytes • Encapsulation mode: tunnel or transport

  5. Policy Database Elements (cont’d) • Peer authentication: pre-shared secret key, digital signature, public key encryption • Negotiated Security Association’s Lifetime: seconds and/or kilobytes protected • Perfect Forward Secrecy for negotiated keys

  6. Why PKI Interaction? • Peer authentication with pre-shared keys: • pre-shared secret key used to prove identity • limited scalability • opportunistic encryption impossible • Peer authentication with PKI • digital signature or public key used to prove identity • scalable • opportunistic encryption possible

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