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MIXZ1

join:2001-01-02
Mexico
reply to Link Logger

Re: Can anyone crack pigeon's wartime code?

Nd an interesting variation on the OTP:
»news.google.com/newspapers?nid=1···,5921109


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said by MIXZ1:

Nd an interesting variation on the OTP:
»news.google.com/newspapers?nid=1···,5921109

Actually, that looks like the employment of an Ottendorf cipher, which is about as effective as an OTP, as long as the messages are kept fairly short and the key is changed frequently - hopefully to material in a different language each time. The beauty of the German approach is that they could so readily change the key to any printed matter known to be in both their hands and their agent's, the name of the key being communicated openly by a special phrase in a radio broadcast. That avoided the problem of securely distributing physical key pads to agents, but using non-random keys (since all printed languages are non-random) does reduce the impenetrability of the coded message... hence the desireablility of a change to the key language with each new message in order to keep security to a maximum.
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