Cryptography is the science and art of transforming messages to make them secure and immune to attack. |
| Cryptography is used to encryption renders a message unintelligible to unauthorized personnel. Decryption transforms an intentionally unintelligible message into meaningful information. |
| Cryptography algorithms are classified as either symmetric-key methods or public public-key methods. |
| In symmetric key cryptography, the same secret key is used by the sender and the receiver. |
| A cipher using the substitution method substitutes one symbol with another. Substitution can be categorized as either monoalphabetic or polyalphabetic. |
| Operation modes to handle long messages include the most common like ECB mode. |
| In public key cryptography, the public key is used by the sender to encrypt the message the private key is used by the receiver to decrypt the message. |
| One of the commonly used public key cryptography methods is the RSA algorithm. |