O teste de Friedman.
Mini-programa em Maple para calcular índice de coincidência e fazer o teste de Friedman (disponível aqui).
O código ENIGMA: uma introdução, usando a página de Tony Sale, director do museu de Bletchley Park.

Exercício #2  (a entregar antes de 23/10/2003, de preferência por correio electrónico):
Decifrar o seguinte texto, sabendo que foi codificado com a cifra de Vigenère:

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shrlsleqbadhbjesvn »

Quinta 16/10:

Detalhes do funcionamento das máquinas ENIGMA, com extractos do filme do mesmo nome.