November 1, 2004Introduction to Computer Security ©2004 Matt Bishop Slide #8-58 Example: Both Alice wants to send Bob message HELLO both enciphered and authenticated (integrity-checked) –Alices keys: public (17, 77); private: 53 –Bobs keys: public: (37, 77); private: 13 Alice enciphers HELLO (07 04 11 11 14): –(07 53 mod 77) 37 mod 77 = 07 –(04 53 mod 77) 37 mod 77 = 37 –(11 53 mod 77) 37 mod 77 = 44 –(14 53 mod 77) 37 mod 77 = 14 Alice sends 07 37 44 44 14
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