Programming Tips For Versatile Coders

Archive for the “Cryptography” Category

Feb 04 2011

How The XOR Operation Works and How to Use it In C to Create a Small Encryptor

Posted by Spyros in C/C++ Programming, Cryptography, tags: code small encryptor, exclusive or, how to use xor, simple xor encryption, xor encryptor in c, xor operation

Exclusive OR (xor) is probably one of the most used operations in today’s encryption schemes. If you’re into creating some kind of encryption in your programs, you would need to utilize XOR operations, as XOR is a pretty versatile “tool” that you should use. If you care to know, XOR is actually an exclusive OR operation. While a simple OR is something like ‘x + y’, exclusive OR is the operation xy’ + x’y. In case you’re not familiar with the mathematic language, + stands for the operation OR, xy is sort for x AND y, while x’ is the NOT equivalent of x.

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Nov 15 2009

Create And Reverse Simple Substitution Ciphers For Fun (and Profit ?)

Posted by Spyros in Cryptography, tags: cipher, create cipher, cryptanalysis, crypto, cryptographic key, Cryptography, substitution cipher

As kids most of us were fascinated by the constant war between the good and the evil when watching our favorite cartoons. Athough we are grown ups now (i suppose), there are still some battles that concern us. If you’re especially interested in cryptography, there is a very big chance that the cryptographers – cryptanalysts still fascinates you.