02 May '13, 6pm

Cryptography and Network Security—The basics

Cryptography and Network Security—The basics

User A transmits a file to user B. The file contains sensitive information (e.g., payroll records) that is to be protected from disclosure. User C, who is not authorized to read the file, is able to monitor the transmission and capture a copy of the file during its transmission. A network manager, D, transmits a message to a computer, E, under its management. The message instructs computer E to update an authorization file to include the identities of a number of new users who are to be given access to that computer. User F intercepts the message, alters its contents to add or delete entries, and then forwards the message to computer E, which accepts the message as coming from manager D and updates its authorization file accordingly. Rather than intercept a message, user F constructs its own message with the desired entries and transmits that message to computer E as if it...

Full article: http://www.edn.com/design/wireless-networking/4413279/Cry...

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