A multi-party polynomial encryption system
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Pcrypt, a multi-party polynomial encryption system. Installation: Python version 2.4 or higher must be installed on your system. Also, the Python Cryptography Toolkit must be installed, you can access it at the url: http://www.pycrypto.org/. USAGE: pcrypt.py [OPTIONS] file -m <number> Minimum number of keys required to decrypt file -n <number> Number of keys to generate -d <filelist> Decrypt the file <filelist> is a list of semicolon seperated point files, such as file.p1;file.p2;file.p3 -o <file> The file to output to By default, the file will be output to file.pcrypt if encrpyting, and file.pdecrypt if decrypting -k <keylength> The length of the key, must be 16, 24, or 32. Default is 16 --help Display a help message For example, to encrypt this file, with 3 people minimum needed to decrypt it and 5 points to be generated, run the command: ./pcrypt.py -m 3 -n 5 README this will create a file called README.pcrypt, as well as five point files, README.p1, README.p2 ... At this point, you would distribute README.pcrypt to everyone, as well as giving everyone one point file. In order to decrypt the README.pcrypt file, you need at least 3 point files. Let's say you have p1, p4, and p5. In order to decrypt the file, run the command: ./pcrypt.py -d README.p1\;README.p4\;README.p5 README.pcrypt Note that you need the '\' in front of the ';' in order to escape from the semicolon being interpereted as a shell specific character. This command will create a file called README.pcrypt.pdecrpyt, which will be identical to README.