English Amiga Board

Go Back   English Amiga Board > Coders > Coders. General

Thread Tools
Old 25 January 2012, 23:27   #41
AMOS Extensions Developer
Lonewolf10's Avatar
Join Date: Jun 2007
Location: near Cambridge, UK
Age: 40
Posts: 1,923
Originally Posted by RedskullDC View Post

Repeating sequence of bytes, $2C in length:

43444937 434E493E 435F4916 43784957 43E2483A 42F74B8A 472C4E17 48D65B86 5D0F79CE 0C00C977 8CCA4932

or 11 long words.

Each long word from the Encrypted image data is XORed with the corresponding long word from the list above then rotated by 16 ( or 68K "SWAP" ).


Encrypted data offset $AA8: $BC04493C
XOR with corresponding long word: $43444937
= $FF40000B
after swap: $000BFF40

Data in RAW Image file at $AA8: $000BFF40

That was fun

Apologies, I thought I had already confirmed that you were correct in decrypting it, but alas 2 months later I see that I didn't

The 11 longwords are actually 4 characters (which never change) that have been masked by 2 (numerical) words calculated using the fibinacci sequence (starting values 0 & 3, thus first word is masked by 3 and second word is masked by 6). That is why the sequence repeats every 11 longwords (as the fibinacci sequence exceeded 65535).

Lonewolf10 is offline  
Old 12 September 2012, 16:54   #42
pmc's Avatar
Join Date: Apr 2007
Location: completely gone
Posts: 1,596
Kind of in the spirit of this thread and it might interest someone...

I visited Bletchley Park recently where they cracked the Enigma code during WWII.

I found the Enigma machine itself, and how it enciphered messages, to be pretty interesting so... I read some stuff about it and then coded my own Enigma inspired cipher routine, in asm of course.

Hopefully it's a bit stronger than the Enigma - there's more possible combinations I think - although I lack the mathematical skills to define just how strong in any meaningful statistical terms.

Anyway, if there is actually anyone out there who might enjoy, enjoy.

EDIT: I went away and totally recoded my cipher and turned it into a complete command line driven tool. Released to the coders releases section.

Last edited by pmc; 16 September 2012 at 23:51.
pmc is offline  
Old 21 September 2012, 23:24   #43
AMOS Extensions Developer
Lonewolf10's Avatar
Join Date: Jun 2007
Location: near Cambridge, UK
Age: 40
Posts: 1,923

I did actually look at the code when you had it up but forgot to reply. It certainly looks cool and I had thought about creating a CLI version, but you have already done it!

Will check it out later.
Lonewolf10 is offline  
Old 10 November 2013, 15:49   #44
Registered User
Join Date: Jan 2008
Location: Warsaw/Poland
Age: 51
Posts: 1,186
Other thread about MoonQuake dercyption:

Don_Adan is offline  

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
aPDF decryption modules MickJT request.Apps 17 24 October 2011 03:23
DMS decryption OddbOd support.WinUAE 1 08 November 2008 11:28
A Challenge! Lucy Looking for a game name ? 9 17 May 2004 18:24
A Challenge! Dastardly Retrogaming General Discussion 26 13 April 2003 16:26
A different challenge BippyM Retrogaming General Discussion 14 25 March 2003 05:17

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT +2. The time now is 02:37.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
Page generated in 0.08378 seconds with 16 queries