Encrypt plaintext by shifting each alphabetical character by a specified number of positions (the “key”). Decrypt ciphertext by reversing the shift using the same key. Understand fundamental ...

A program which performs a frequency analysis on a sample of English text and attempts a cipher-attack on polyalphabetic substitution ciphers using 2 famous methods - Kasiski's and Friedman's.

Learn to use the cipher utility with confidence. This Daily Drill Down walks you through using every cipher switch and shows you exactly what happens in the real world when you use these switches.