CipherSaber is a simple symmetric encryption protocol based on the RC4 stream cipher. Its goals are both technical and political: it gives reasonably strong protection of message confidentiality, yet it's designed to be simple enough that even novice programmers can memorize the algorithm and implement it from scratch. According to the designer, a CipherSaber version in the QBASIC programming language takes just sixteen lines of code. Its political aspect is that because it's so simple, it can be reimplemented anywhere at any time, and so it provides a way for users to communicate privately even if government or other controls make distribution of normal cryptographic software completely impossible.

Read more about CipherSaberHistory and Purpose, Technical Description, Security and Usability

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CipherSaber - Security and Usability
... CipherSaber is strong enough and usable enough to make its political point effectively ... While CipherKnights can use CipherSaber to exchange occasional messages with each other reasonably securely, either for fun or in times of great distress, CipherSaber strips cryptography to ... CipherSaber's author in fact asks users to download and install PGP as one of the steps of becoming a CipherKnight ...