Board Thread:General Discussion/@comment-4854965-20150909205549

I figured out an equation to decrypt any Vigenère cipher without using the chart!

To decrypt a Vigenère cipher without using the chart, use the following equation:
 * α= the number the coded letter is in the alphabet (example: s is 19)
 * β= the number the key letter (corresponding to the coded letter) is in the alphabet (example: g is 7)
 * λ= the number the coded letter is in the alphabet (example: m is 13)

Equation: (α + 1) – β = λ

Example:
 * Message: MABELEATSSPRINKLES
 * Key: GRAVITYGRAVITYGRAV
 * Cipher: SRBZTXYZJSKZBLQCEN
 * Where s is 19, g is 7, and m is 13
 * Calculation: (19+1)-7=13 