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Cipher Tools. Codes, Ciphers, Encryption and Cryptography. Codes, Ciphers, Encryption and Cryptography Cryptography is the discipline of using codes and ciphers to encrypt a message and make it unreadable unless the recipient knows the secret to decrypt it. Encryption has been used for many thousands of years. The following codes and ciphers can be learned and used to encrypt and decrypt messages by hand. iOS App You can now get these codes and ciphers on your iPhone or iPad and send secret messages from anywhere. Monoalphabetic Ciphers A monoalphabetic cipher uses the same substitution across the entire message. Polyalphabetic Ciphers In a polyalphabetic cipher, the substitution may change throughout the message. Polygraphic Ciphers Instead of substituting one letter for another letter, a polygraphic cipher performs substitutions with two or more groups of letters.
Transposition Ciphers Other Ciphers and Codes.