08-03 - Review Questions: 14.8 15.3 16.4 17.9 14.8 X.509...

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Review Questions: 14.8 15.3 16.4 17.9 14.8 X.509 defines a framework for the provision of authentication services by the X.500 directory to its users. The directory may serve as a repository of public-key certificates. Each certificate contains the public key of a user and is signed with the private key of a trusted certification authority. In addition, X.509 defines alternative authentication protocols based on the use of public-key certificates. 15.3 a. It is preferable to sign an uncompressed message so that one can store only the uncompressed message together with the signature for future verification. If one signed a compressed document, then it would be necessary either to store a compressed version of the message for later verification or to recompress the message when verification is required. b. Even if one were willing to generate dynamically a recompressed message for verification, PGP's compression algorithm presents a difficulty. The algorithm is not deterministic; various
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This note was uploaded on 05/11/2010 for the course TCN 5080 taught by Professor Drpan during the Spring '10 term at FIU.

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08-03 - Review Questions: 14.8 15.3 16.4 17.9 14.8 X.509...

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