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.|