Procrypt 2.8 is a very useful program for operating with files. It can be used to encrypt files to lock them, or to analyze and work with raw file data to help those making file formats (I also used it to crack a few file formats)!
The program also comes with a dll to speed certain operations up. However, it doesn't always initialize. For some reason, Firefox tends to keep it from initializing.
Procrypt has the following file operations:
Binary - a basic file data analyzer. It produces a file with information on an input file (dll-supportive).
Extract - like binary, but limited to base-10 numbers separated by commas. The advantage to this one is that the operation can be reversed, producing data from the base-10 numbers.
Encrypt - A basic file encryption filter. Uses another file as an encryption key. Supports xor, byte inverting (256-x), modulated addition and subtraction (Basically combines the files, but the key file is cycled).
Switch - A byte-substitution encryption. Uses a substitution layout (a file, which can be randomly generated).
Compress - A very basic text-compressor. Compresses only the 96 typable characters (bytes will cause an error).
Compare - Runs a comparison test between two files. It can be used to determine if a file is different from another file (dll-supportive).
Split - Used to break a large file into several smaller files. These can be rejoined to the original file without any corruption (dll-supportive).
Access - An advanced file data manipulator/viewer. Files can be opened and viewed in several formats. Chunks of the file can be viewed at one time to avoid loading large files into the ram. Allows individual byte editing in all viewable formats.

Also, a calculator is available to evaluate any Game Maker expression.

Also note the little pop-down option box.
Recognize that not all the operations are dll-supportive. Turn off 'external' in this box to use functions that are not supported. To try re-initializing the dll, click the little retry button (usually it doesn't work; try closing and reopening).
Also in the box, the limit is the size of the file to affect/read/write (the limit size can be in bytes, KB,MB, and GB).

The other buttons, on the right in the window titlebar, are the following:
Sound - whether or not to play a sound indicating a file operation is complete.
Stayontop - if the window should always stay over other windows.
Hide - makes the program invisible. Press F9 to restore
(Warning: you can't shut down when it's running).
Exit - exits the program.

Tags: file, encryption, decryption, program, data, operation, manipulation

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