Encryption is the encoding of a message or data to prevent it from being accessed or read by unauthorized parties. Two types of Encryption Algorithms are the Symmetric-key algorithm, a.k.a. the secret key algorithm, and the Asymmetric key algorithm, better known as the public key algorithm. “Encrypt” comes from the ancient Greek word “kryptos” which means hidden or secret. Crypto, as used in cryptocurrency, has the same meaning.