Decipher

A Java-based deciphering program ported over to Python via j2py. Licensed under the MIT License.

Original source code is based off a final project done for CS167 - Introduction to Cryptography while attending UCI.

The program uses a word-count pattern-matching lookup strategy to find the best key mapping to decode the provided cipher text. The cipher text is based off of the provided literary source files which are used to decipher the text.

Usage

This page describes how to use both versions of the Decipher program.

Java

JDK6 was used to compile and run the code with the following commands:

$ javac *.java

Once compiled, you can run the code by specifying the required arguments:

$ java Decipher [CIPHERPATH] [TIMELIMIT]

Options and Arguments

The literary source files are assumed to be named source1.txt, source2.txt, and source3.txt located in the same dir as the code

• [CIPHERPATH]

  Read the cipher text from the given file path.

• [TIMELIMIT]

  Optionally specify the time limit in milliseconds.

Python

Python 2.7.2 was used to port and execute the code:

$ python Decipher.py [SOURCEFILES] [CIPHERPATH] [OPTIONS]

Options and Arguments

• [SOURCEFILES] Specify one or more source files to decipher the text from.

• --cp CIPHERPATH Specify the cipher text file using the --cp tag.

• --tl TIMELIMIT Optionally specify the time limit in milliseconds.

Note

This is not a stable version so use at your own discretion.