What is the easiest cipher to learn?

The Rail Fence cipher, also known as the Zigzag cipher, is a transposition cipher that writes the plaintext in a zigzag pattern down and across several "rails" of equal length before reading it off in a straight line. This adds an extra layer of complexity to the decryption process.

EASY CIPHERS encompass a range of techniques used for encoding and decoding messages. One such method is the Pig Pen cipher, which involves rearranging letters in a grid to create a secret message.

Another popular easy cipher is the Caesar cipher, where each letter in the plaintext is shifted by a fixed number of places in the alphabet. This simple substitution cipher was named after Julius Caesar, who reportedly used it to communicate with his generals.

The Polybius Square, or Polybius cipher, is a substitution cipher that uses a 5x5 grid of letters to represent each plaintext letter. The method involves converting the plaintext into a series of numbers corresponding to the grid positions, which can then be rearranged or substituted to create the ciphertext.

Simple transposition is another form of encryption that involves rearranging the order of the letters in a message, rather than substituting them. This method can be effective but is also relatively easy to crack with the right tools and techniques.