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Re: [ELPA] New package: vigenere

From: Uwe Brauer
Subject: Re: [ELPA] New package: vigenere
Date: Sat, 02 Sep 2017 08:28:21 +0000
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.0.50 (gnu/linux)

>>> "Ian" == Ian Dunn <address@hidden> writes:

   RMS> Please add text to the doc string saying,

   RMS> This is for historical interest, not a serious system for encryption.

   RMS> You might think everyone knows that, but most people are not curious
   RMS> about ciphers.

   > Done. I often find packages through their functions, so I added a note
   > about it to the function doc strings and the package commentary, for
   > good measure.

If I am not mistaken a Vigenere cipher is secure, if

    -  the key is as long as the message

    -  the key will only be used once

    -  the key is a random sequence

I am not entirely sure, but maybe this was the first implementation of a
one time pad.

BTW I think historically the autokey cipher, (the secret text is
added to the secret key) was also introduced by Vigenere. Maybe you
could add feature for historical reasons?

Uwe Brauer 

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