Straddle Checkerboard Cipher

The straddling checkerboard is a substitution cipher, except that the substitutions are of variable length. The key for a straddling checkerboard is a permutation of the alphabet along with 2 numbers between 0 and 9. See Wikipedia for more information.

Plaintext:
Alphabet Key
Enter a keyword, phrase or alphabet and the rest will be calculated for you.

Spare Positions:

Ciphertext: