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From: Ben Bacarisse <ben@bsb.me.uk>
Newsgroups: sci.crypt
Subject: Re: an scos2 test...
Date: Sat, 27 Jul 2024 01:20:34 +0100
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"Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> writes:

> On 7/26/2024 2:32 AM, Richard Harnden wrote:
>> On 26/07/2024 06:15, Chris M. Thomasson wrote:
>>> On 7/25/2024 8:54 PM, Rich wrote:
>>>> scos2 65 33
>>>>
>>>> 0ZGS XB sJ@ lH ~i<8/
>>>
>>> For some reason I am getting a plaintext of:
>>>
>>> ~U9o My 8/g v[ Ym9\;
>>>
>>> using my impl and Rich's original scos2 impl.
>> The key is wrong, try:
>> 28 60
>> 0ZGS XB sJ@ lH ~i<8/
>
> Indeed it works like a charm. It had to be a "key issue". Humm... That
> would be a fun test? Try different keys and log "readable" results wrt
> decrypted plaintext? ;^)

Yes.  Somewhere I have a program that just tries all keys.  I was going
to get it to stop when English (or C) letter frequencies were found but
it turned out simpler just to eyeball the output.  As a human, you can
spot a decrypt a mile off and, if I remember correctly, SCOS has "close
decrypts" that I could spot but which would look, statistically, like
plaintext.

-- 
Ben.