APPENDIX B
Measures of Secrecy and Security
Properties of the Entropy Function
In this appendix, we look at measures of secrecy and security of cryptosystems from two different points of view. First, we use concepts of conditional probability to discuss the concept of perfect secrecy. We then reformulate the results obtained in terms of entropy, which in turn depends on concepts of conditional probability. For the reader who needs a refresher, the chapter opens with a brief introduction to conditional probability.
All of the concepts in this appendix were first introduced in Shannon’s landmark ...
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