It is encrypted into cipher text with a cryptographic algorithm, which will in turn be decrypted into usable plaintext. In symmetric cryptography single key is used for encryption and decryption e.g. Data Encryption Standard (DES) and Advanced Encryption Standards (AES).In asymmetric algorithm different keys are used to encrypt and decrypt the data.RSA is widely used in electronic ecommerce protocols. With sufficiently long keys and the use of up-to-date implementations; RSA is believed to be totally secure.