Garrett Larsen

Unhandled overflow condition in Playfair decrypt

1

https://github.com/arosspope/cipher-crypt/blob/aab6174944abe95ce9259aafaf74d901680bc562/src/playfair.rs#L115 This shift rule does not correctly handle cases where the `usize` index into the vector will overflow negative upon subtraction. Example code that replicates the issue: ```rust extern crate...