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Finished the section on signing and encryption.
Tue, 10 Jul 2012 22:28:10 +0200, by markus schnalke
Mentioned the source of the Dijkstra quote and fixed the ref system.
Tue, 10 Jul 2012 18:48:32 +0200, by markus schnalke
style: Fixed indent for verbatim text.
Tue, 10 Jul 2012 18:18:08 +0200, by markus schnalke

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