Encrypt and decrypt using Bellaso Cipher Algorithm

Normal Bellaso cipher algorithms just uses 26 letters. This program adds the ten digits, space and four punctuation marks. Some Bellaso programs spell out the numbers if they encounter a digit in the plaintext file; this becomes cumbersome (not to mention incorrect) with numbers greater than nine.

The Bellaso Cipher creates an encrypted file which exhibits a nonsensical character distribution. Code breaking cannot be achieved by analyzing the character distribution of the encrypted file. See BellasoCipher.png.

Longer, more complex keywords result in stronger encryption.

Keyword characters limited to letters, digits, spaces, periods, commas, question marks and exclamation marks.

You can email Encrypted messages to other people. The key word/phrase is not included in the email. Of course, it should not be in the subject line.

More information about Bellaso Cipher history and related encryption methods at WikiPedia

Multiple encryptions with different various length keys will severely hinder code breaking. Here is a Wikipedia article describing the original method of attacking the Bellaso cipher. Kasiski Method