On Wednesday, September 27, 2017, 11:51:22 AM PDT, \0xDynamite
   <dreamingforward@gmail.com> wrote:
   >>Hmm, as far as I'm aware, you can't do cryptanalysis on 2 characters.
   >>Marxos
   >> A factoid which is irrelevant in this context.
   >> If you only wanted to encrypt two characters, once, you could use
   ROT-13 and
   >> nobody would be the wiser.
   >ot a factoid.  I'm making the claim that you can't decrypt it.  I
   don't want to do the proof, because I can deduce it, with Pretty Good
   Certainty (TM).  If you have a key approx 1/2 the size of the text,
   AND you do NOT know the length of the key, you have essentially two
   characters to do cryptanalysis.  Now the key may be a small enough
   dictionary to do more analysis, and since you know that each set of
   the same modulus is using the same key character, but without knowing
   the length of the key, it's going to be next to impossible.  There are
   many false leads (key-text combinations which result in what seems
   like valid plaintext) and the search space becomes too large.
   >Marxos
   You've added the silly limiting condition that you are referring only
   to messages with two characters, which has virtually nothing to do with
   most messages sent by OTP.
   And, I observe if indeed you are only referring to two character
   messages, then the One Time Pad with half that number of characters,
   ONE character, amounts to the same thing as ROT-13, except where the
   number "13" is allowed to vary between 0 and 25.
   Highly UNinteresting.
                       Jim Bell