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Penetration Testing: Protecting Networks and Systems by Kevin M. Henry

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APPENDIX 2: ENCRYPTION

Concepts of cryptography

Cryptography is the art and science of transmitting and storing data in a format that cannot be understood by an unauthorized party. Cryptography has been a key part of secrecy used by the military, governments and tradesmen for thousands of years. Evidence of this can be seen in some of the early samples of encrypted writing used to protect intellectual property in ancient Mesopotamia.

Cryptography is used today for more than just secrecy. Modern cryptography leverages the additional benefits provided by public key or asymmetric cryptographic systems for secrecy, integrity, access control, non-repudiation and authentication.

The following is a very high-level overview of cryptography intended to ...

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