There are several different encryption methods. Each is designed for specific purposes. Each method uses an algorithm and key to convert raw data into the encrypted form called ciphertext. There are different encryption methods that determine how the ciphertext chunks are linked.

The most straightforward method of encryption is symmetric key encryption. This type of encryption was used in email programs and to secure communications during World War II, as depicted in the movie The Imitation Game. A symmetric encryption algorithm takes the plain text message, and jumbles it up with mathematical permutations and then encodes it by using the same secret keys that was used to encode the message. This key is typically employed once and is secured after the message has decrypted.

Other types of encryption are public-key cryptography and asymmetric cryptography. RSA is the most well-known public-key encryption algorithm. Its security is built on the difficulty in factoring large primes. Another common method of asymmetric encryption is the Diffie-Hellman protocol, which employs the same principle to secure the key exchange.

A symmetric encryption method is the Triple DES technique, which encrypts data blocks thrice with the Data Encryption Standard (DES) cypher. This technique is used to protect ATM PINs and UNIX passwords. Triple DES is slow, however it offers good security against hackers. Elliptic Curve Cryptography is a more advanced encryption technique that offers greater security, without the need for longer keys. This technique is utilized in SSL and TLS protocols to secure web communications.

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