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Typo in Madness’ “A book on classical cryptography”?

The Empty Vault Forums Bureau of Security and Signals Intelligence Forum Typo in Madness’ “A book on classical cryptography”?

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  • #87722
    Shinglington
    Participant

    Also, in the Cadenus example encryption. The final encryption seems to have used a slightly different last few letters of the plaintext (I get “WHATEVV” as the last bit, instead of “WUTEVUH”.
    Is this an intentional “error”? Or if it’s a genuine mistake, maybe should be corrected

    #87721
    Shinglington
    Participant

    I’m not sure where to ask about this, but as I’m going through all the transposition ciphers in Madness’ Book on Classical Cryptography (which I wish I had found out about at the start of the challenge, but that’s my bad for not looking hard enough for resources), under the Cadenus hill climbing attack, one of the key modifications is to “change one member of the child shift key to a random number in 0, …, 25”.

    I might be wrong, but should it be “random number in 0, …, 24” since cadenus “alphabet” has 25 letters which means a shift of 25 is the same as shift of 0?

    Sorry if this is the wrong place to report this, but not sure how to contact Madness about it directly. (sorry if there were clear contact details that I missed)

    Please let me know if I’m mistaken here.

    #87794
    madness
    Participant

    Thanks. Both now fixed in the github version. Harry should update his copy.

    “(which I wish I had found out about at the start of the challenge, but that’s my bad for not looking hard enough for resources)”
    Preparation is the key to success.

    #87795
    madness
    Participant

    @Harry should also update his copy of Gaines. Please. The children deserve better.

    [I did try, but WordPress won’t allow us to upload the nice epub version you provided, Madness. I tried converting that to PDF, but it came out as bad as the current version. I considered linking to a  hosted copy elsewhere but haven’t had time to sort that out, sorry. Harry]

    #87803
    madness
    Participant

    [Thanks Madness! Uploaded the new version. Best wishes, Harry]

    #87906
    Mariya07
    Participant

    thanks

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