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Безопасность интернет-приложений осень 2013 лекция 8
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Безопасность интернет-приложений осень 2013 лекция 8

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  • 1. - конфиденциальность - подлинность - неотчуждаемость 2
  • 2. S Alice S, O P = encrypt(O,S) Bob P S,P O = decrypt(P,S) 3
  • 3. key PRNG plaintext ciphertext 4
  • 4. A5/1,A5/2 RC4 Salsa20 SEAL … 5
  • 5. main key key1 PRNG key2 PRNG key3 PRNG 6
  • 6. DES 3DES AES Twofish … 7
  • 7. Alice A,A’,B’,O P = encrypt(O,B’) Bob P B,B’,A’,P O = decrypt(P,B) 8
  • 8. RSA Cramer-Shoup ECC … 9
  • 9. Alice Bob secret: public: open 10
  • 10. Alice Bob apq p,q b A=q^a mod p A bqp apqA S = B^a mod p B B=q^b mod p S = A^b mod p 11
  • 11. S S’ MD5 RIPEMD SHA1 … 12
  • 12. Client Server ClientHello ServerHello Certificate ServerHelloDone ChangeCipherSpec Finished ChangeCipherSpec Finished 13