This is a puzzle cache. Please do not go to the posted coordinates, nothing is hidden there. For necessary background information please see part one (GC9NT53) and part two (GC9PAWZ).
With the benefit of more experience Cacher Craig realized that some of the design features of his cryptosystem that were meant to aid a human doing the decryption by hand don't really make sense now when computers can simply do it all for you!
There is no reason the first digit of a codeword needs to tell you the length of the codeword. As long as no codeword is a prefix or another codeword (for example you couldn't have both "123" and "1234" as codewords) you can still uniquely determine the boundaries if you know the key. With this change all codewords will still have a length between 2 and 9, but the first digit no longer has any meaning.
There is also no reason the last digit of a codeword needs to tell you the shift applied after that codeword is used. These shifts can also be secret values that are part of the key. With this change all codewords have a secret shift between 0 to 25 (inclusive) with the last digit no longer having any meaning. Some shift values can be repeated and some may not be used at all.
After these two changes Cacher Craig has become overconfident. He is convinced there is no way anyway can break the code now!
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