Vigenere Cypher
The Vigenere system uses the (base-10) numeric values of the letters of the alphabet (regardless of case) to encrypt text. The value of each letter the plaintext is added to the value of each letter of the key to provide the letters of the cyphertext.

To Encode: Input the text to encode in the plaintext field, and the key into the key field, then click Encode.
To Decode: Input the text to decode int othe cyphertext field, and the key into the key field, then click Decode.
To KeyFind: Input the unencoded text into the plaintext field, and the encoded text into the cyphertext field, then click Find Key.

Rot-X Finder
To use the Vigenere program to run Rot-X, merely enter a single character as the key. The program below will determine which character to use (or what Rot a character is).
To Use: Input the desired Rot number or Vigenere key, and click the appropriate button to find the other.