We redesigned MysteryTwister, enjoy! Feedback

 Explore Challenges

A Cloaked Substitution Cipher — Part 2 Level 2

by Bruce Kallick, published on 8/25/2019

Like the MONOALPHABETIC SUBSTITUTION WITH CAMOUFLAGE series of challenges, this two-part challenge considers a modification of the classic simple substitution cipher achieved by randomly introducing decoy characters into the ciphertext in encryption which are then ignored in decryption. In part 2, the plaintext is first divided into two parts, then each part will be encrypted separately.