The XECryption Solver GUI program is designed to assist you in deciphering text encrypted by the XECryption cipher. This cipher appears to originate from the realistic mission level 6 on hackthissite.org. In addition to the binary you can also download the source code which is licensed under the GPL version 2.0. The program is written in C# and so you probably need one of those .NET framework things installed.
NOTE: This post has been imported from my old it’s learning ePortfolio project blog.