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It is used on various files in the game Uplink by Introversion Software, to prevent people from hacking the game too easily. REDSHIRT is an encryption system whereby every byte is XOR'd by 128 (0x80). Regarding the REDSHIRT encryption that's used to encrypt the world.dat file, here is the best description I found of it:

Supporting Introversion is in your best interest because we want them to make more awesome games. Please don't pirate a copy of Uplink, support Introversion by buying the game.
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I got my original copy of the 'world.dat' file by creating a virtual Windows machine on my Mac (using Sun VirtualBox), downloading an Uplink Version 1.51 CD ISO image from BTJunkie using the Vuze BitTorrent client, and extracting the Uplink CD ISO image with IsoBuster.
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AFAIK, the file is not included if you install Uplink on a Mac via download from Steam (as I did) instead of installing from an Uplink CD or CD image. The 'world.dat' file is installed to the 'C:Program FilesUplink' folder when you install Uplink on Windows. You must first decrypt the 'world.dat' file before you can use it as a key file to decrypt the 'Readme.txt' file and the image files. The 'world.dat' file itself comes encrypted using 'Redshirt' encryption. The 'world.dat' file is the one-time-pad key file used to both encrypt and decrypt the 'Readme.txt' file and the encrypted Book 2 image files. To reverse the process and decrypt the encrypted text (the ciphertext) you XOR the encrypted bytes with the same bytes in the key file to get the unencrypted plaintext. For encryption, you XOR the plaintext file bytes (the original unencrypted bytes) with some of the bytes in the one-time-pad key file. The key file is used for both encrypting the original unencrypted plaintext message and for decrypting the encrypted ciphertext message. This other file is the one-time-pad, also known as the key file. In the case of Uplink Game Bible book 2 it means that the original file had each byte XOR'ed with some of the bytes inside another file. You can read about one-time pad encryption at. The key file is itself encrypted with REDSHIRT encryption.'

What the 'ONETIMEREDSHIRT' header actually means is, 'This file was one-time-pad encrypted using the bytes in a key file. This 16 byte header is a hint that the file is somehow encrypted using both one-time-pad encryption and REDSHIRT encryption.Īfter reading lots and lots of posts in the Introversion Uplink forum, forcing one to wade through lots of posts from douche-bags taking way too much enjoyment out of being in the know, the answer becomes clear. The encrypted readme.txt file and the 52 encrypted image files all begin with 15 bytes which spell 'ONETIMEREDSHIRT' followed by a 0 byte (a null).
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I used He圎dit for Mac by SoftTonic which is available at. When you use a hex editor to look inside the readme.txt file and the image files, you see that all the files begin with the same 16 bytes: You didn't think it was going to be easy did you?' Basically the author throws down the gauntlet.
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You'll also find a readme.txt file, detailing how to find Book III. a 'book2.html' file with the message, 'Book II is located on this CD in the book2 directory.


Book 2 is in the 'book2' folder on the CD. The Game Bible only contains design notes and sketches the Introversion developers made while developing Uplink, it does not contain any strategy hints, tactics, or secrets necessary to complete the game(AFAIK).īook 2 is found on the Uplink Bonus CD. It is not necessary to hack the Game Bible in order to play the game.
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I use the Vuze BitTorrent client on a Mac and the website Ī word of warning - the challenge of getting the Uplink Game Bible was mostly intended for other Software Developers or hard-core computer enthusiasts. Be advised that all the books of the Uplink Game Bible are available in unencrypted form in the Uplink Developer CD which can be downloaded via BitTorrent. Spoiler alert - these posts tell how to decrypt the books of the Uplink Game Bible.
