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From: "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com>
Newsgroups: sci.crypt
Subject: Re: [Christmas Challenge 2024] Crack Doppelkastenschluessel-Hex
Date: Fri, 20 Dec 2024 13:00:30 -0800
Organization: A noiseless patient Spider
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On 12/20/2024 12:51 PM, Stefan Claas wrote:
> Chris M. Thomasson wrote:
>> On 12/20/2024 12:35 PM, Stefan Claas wrote:
>>> Hi all,
>>>
>>> I recently finished my Doppekastenschluessel-Hex project,
>>> which is a simplified version of the original German WWII
>>> cipher, with hex notation.
>>>
>>> For more details check my previous thread 'Seriation'
>>>
>>> Your task is to crack the provided message, which uses
>>> only one key for encryption, instead of two (default)
>>> or more.
>>>
>>> The message:
>>>
>>> 75 A2 85 D1 84 59 85 2D 25 CB 85 1C 24 70 27 6C
>>> C5 3C 65 2E 87 6C 8E E7 89 E9 C9 3E 8E 7D 8E D6
>>>
>>> Please note: The message is written as normal text and
>>> not like plaintext messages from the old days and with
>>> padding applied.
>>
>> Perhaps we need a larger amount of ciphertext?
> 
> That would make cryptanalysis easier, right?

I think so. Depends on the algorithm. If it's secure than perhaps no so 
much... The interesting aspect of SCOS is that it's not secure at all.

> 
> BTW. For drawing the winners, should they been drawn from
> a random pool of entries, or by first come first serve?
> 

That is up to you! :^)