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Protection authentication authorization confidentiality

Protection authentication authorization confidentiality. Crypto. Shared key k 1 = k 2 Public key k 1 ≠k 2. (DES). (RSA). sign, verify. Security Primitives. encrypt, decrypt. Authentication Who is requesting? (same principal as before) Mesg that was sent = mesg recv. Model.

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Protection authentication authorization confidentiality

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Presentation Transcript

  1. Protection • authentication • authorization • confidentiality

  2. Crypto Shared keyk1 = k2 Public key k1≠k2 (DES) (RSA)

  3. sign, verify Security Primitives encrypt, decrypt

  4. Authentication • Who is requesting?(same principal as before) • Mesg that was sent = mesg recv.

  5. Model

  6. authentication technical name psychological trust

  7. Integrity ≠Authenticity ≠Confidentiality • One time pad → no! checksum dependent on key • CRC

  8. k1≠k2 → MAC k1=k2→ signature {hash(m)}kApriv

  9. Key Distribution Problem A →B “A’s pub key is X” certificates CA –certificate authority

  10. Attacks crypto replay impersonation Secure Comm. Channel Use pub. key to authenticate Exchange a shared keyProperties of crypt. Protocols 1) freshness 2) appropriate 3) forward secrecy

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