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Unformatted text preview: N , which you can do by brute force. Consider this message: RFEHAAOAAECERSBKINIREYRLCPSETE First lets try N = 2. There are 30 characters in the message, so we write the rst 15 letters on the top row, and the last 15 on the second: 1 RFEHAAOAAECERSB KINIREYRLCPSETE Now we start unwinding it vertically: RKFIENHI. .. That doesnt look too promising. So lets try N = 3. Now we have 10 characters per line: RFEHAAOAAE CERSBKINIR EYRLCPSETE Now we start unwinding it vertically: RCEFEYERR. .. Hmmm. That doesnt look too good either. Now lets try N = 4. So the rst two lines will have 8 characters, and the last two will have 7: RFEHAAOA AECERSBK INIREYR LCPSETE And again we start unwinding it vertically: RAILFENCECIPHERSAREEASYTOBREAK That is to say: Rail fence ciphers are easy to break Success! 2...
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- Winter '08