... encryption techniques into areas such as authentication, data integrity, and non-repudiation of data transfer. In the following, basic terminology and the main methods of cryptography are presented. Any opinions and evaluations presented here are speculative, and neither the authors nor SSH can be held responsible for their correctness - although every attempt is made to make sure that this information is as correct and up-to-date as possible. * Basic Terminology Suppose that someone wants to send a message to a receiver, and wants to be sure that no-one else can read the message. However, there is the possibility that someone else opens the letter or hears the electronic communication. In cryptographic terminology, the message is called plaintext or cleartext. Encoding the contents of the message in such a way that hides its contents from outsiders is called encryption. The encrypted message is called ciphertext. The process of retrieving the plaintext from ...

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