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The Andrew Protocol Corrected 1 A B : {N A } K AB 2 B A : {N A,N B } K AB 3 A B : {N B } K AB 4 B A : {K AB,N B,N A } K AB

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The Andrew Protocol Corrected 1 A B : {N A } K AB 2 B A : {N A,N B } K AB 3 A B : {N B } K AB 4 B A : {K AB,N B,N A } K AB N A in the 4 th message is kown by A to be fresh

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Checking the Andrew Protocol Corrected B BABA B B shk K' AB shk K' AB fresh {K' AB,N' B,N A } K AB shk K' AB AG(rec {K' AB,N' B } K AB B A fresh N A B A B B shk K' AB )

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shk K' AB Checking the Andrew Protocol Corrected B BABA B B shk K' AB AG(rec {K' AB,N' B } K AB B A fresh N A B A B B shk K' AB ) rec {K' AB,N' B,N A } K AB B B send A {K' AB,N' B,N A } K AB fresh {K' AB,N' B,N A } K AB B B fresh{K' AB,N' B,N A } K AB (fresh K' AB fresh N' B fresh N A ) rec {K' AB,N' B,N A } K AB fresh {K' AB,N' B,N A } K AB

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AG(rec {K' AB,N' B } K AB B A fresh N A B A B B shk K' AB ) Checking the Andrew Protocol Corrected B BABA B B shk K' AB shk K' AB rec A {K' AB,N' B,N A } K AB B A rec {K' AB,N' B,N A } K AB The property holds of the corrected Andrew Protocol

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Exercise Simplify 5x + 3y – x + 10y. 4x + 13y. Simplify 74 – 5m – 2m – 8. – 7m + 66 Exercise.

Exercise Simplify 5x + 3y – x + 10y. 4x + 13y. Simplify 74 – 5m – 2m – 8. – 7m + 66 Exercise.

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