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Aren't they delievering by the network the same as the encypted messages? No. At least not in the plain. What doing it end-to-end encrypted? Try to search for the key agreement protocol (e. g. Diffie-Hellman ) and asymmetric encryption (e.g. RSA ). The "asymmetric" encryption allows sending encrypted and signed messages without sharing the private (...


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The Otway-Rees protocol has been widely used as an example in the study of the formal analysis of authentication protocols, but has not been used in practice. Such implementations as exist have been in the form of input to protocol analysis tools or academic exercises. One example is a thesis Implementation of Otway-Rees Protocol. Note that this does not ...


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M connects the two enciphered parts of the second message so that $S$ can detect a message constructed from parts of previous messages by an intruder. Other protocols of the time used double encipherment to do the equivalent. Double encipherment required either two enciphering engines or a path for arbitrary data that bypasses the enciphering engine. This ...


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