Running key cipher: Difference between revisions

Revision as of 13:26, 18 June 2009

Revision as of 11:02, 23 June 2009

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Next we need to tell the recipient where to find the running key for this message. In this case, we've decided to make up a fake block of five ciphertext characters, with three denoting the page number, and two the line number, using A=0, B=1 etc to encode digits. Such a block is called an '''indicator block'''. The indicator block will be inserted as the second last of each message. (Of course, many other schemes are possible for hiding indicator blocks). Thus page 63, line 1 encodes as 'AGDAB'. (06301).

Finally we can send the message 'JCVSR LQNPS YGUIM QAWXS AGDAB MECTO'.