Cryptography is a technique of encrypting and decrypting messages. When the text is encrypted, it is unreadable by humans. When the text is decrypted, it is readable by the humans. The terms used in cryptography are as follows: Plain text: This text can be read by a user. Cipher text: This text can be converted to a non-readable format. Encryption: It is the process of creating a cipher text from a plain text. Decryption: It is the process of converting a cipher text to a plain text. Cipher: It is an algorithm that is used to encrypt and decrypt text. Key: Keys are the elements that are used in the technology of encrypting and decrypting text. For more information read Cryptographic attack