Software Engineering Auto Key Cipher Autokey (Autoclave) Cipher is a Symmetric polyalphabetic (Polyceaser) substitution cipher. This algorithm is about changing plain text letters based on secret key letters.
Software Engineering Play Fair Cipher Play Fair Cipher was the first practical digraph substitution cipher. In play fair cipher unlike traditional cipher, we encrypt a pair/digraph of alphabets (digraphs) instead of a single alphabet.
