One of the most common non-computerized forms of cyptography is the classic substitution cipher, in which the encryption is based on one letter being replaced by another in the alphabet, such as "A = R, B = Y", etc. Note that throughout this tutorial, I will capitalized all solved letters in the expression. You will need: - An online letter positioning dictionary (a dictionary that searches words depending on the positions of letters. Often used for crosswords) - A piece of paper or a Word Document