The CryptoBuddy Secret Decoder Ring for the iPad uses a character substitution cipher to create a crypto-code that can be sent to your friends. For example, if you wanted to send your friend a secret message of “HAPPY”, after sing the Secret Decoder Ring you would get a code of “YPKKC.” Send this message to your friend and they can use their Secret Decoder Ring to decode the message “HAPPY.” Anyone without the CryptoBuddy Secret Decoder Ring will not be able to decipher the message. CryptoBuddy’s Secret Decoder Ring for iPad uses the same secret character substitution cipher as CryptoBuddy’s Original Secret Decoder Ring, so either version will decipher your message.