As knowledge of Atbash and Caesar ciphers spread, they obviously became less useful for preserving secrets. Mixed alphabets (or deranged alphabets) require a bit more work for strangers to unravel.
One common method for creating a mixed alphabet cipher is to share a keyword (e.g., “MEMORIALIZE”) with your partner, remove any repeated letters (“MEORIALZ”), and append the unused letters in alphabetical order (see below).
Plain: a b c d e f g h i j k l m n o p q r s t u v w x y z
Cipher: M E O R I A L Z B C D F G H J K N P Q S T U V W X Y
Alternatively, you could randomly assign a cipher letter to each plain letter. This is harder to remember, though, which means you’ll probably risk writing the sequen
