CRYPTOGRAPHY CONCEPT
Cryptography is the art and science of keeping data secure. Cryptographic services help ensure data privacy, maintain data integrity, authenticate communicating parties, and prevent repudiation (when a party refutes having sent a message). Basic encryption allows you to store information or to communicate with other parties while preventing non-involved parties from understanding the stored information or understanding the communication. Encryption transforms understandable text (plaintext) into an unintelligible piece of data (ciphertext). Decryption restores the understandable text from the unintelligible data. Both functions involve a mathematical formula (the algorithm) and secret data (the key). Cryptographic algorithms There are two types of cryptographic algorithms: 1. With a secret or symmetric key algorithm, the key is a shared secret between two communicating parties. Encryption and decryption both use the same key. The Data Encryption Standard (DES) and