What is Decryption?
Decryption Definition: The reverse process from encryption. It is the process of converting a ciphertext message back into plaintext through the use of the cryptographic algorithm and the appropriate key that was used to do the original encryption.
Understanding Decryption
Decryption is the process of transforming unreadable encrypted data back into its original, intelligible form. In simple terms, it reverses encryption by applying the appropriate cryptographic algorithm along with a specific decryption key—the same key or a mathematically related one used during the encryption process. This mechanism ensures that only authorized users can access the protected information.
Standards such as FIPS 197, which outlines the specifications for AES, guide the decryption process, ensuring that it meets rigorous security benchmarks. To maintain the security of decryption, organizations invest in robust key management, secure key storage, and strict access controls. For instance, when an encrypted email is received, the recipient’s email client uses their private key to decode the message, converting ciphertext back to plain, readable text.
Related terms include Encryption, Cryptography, Ciphertext, Plaintext, Key Management, Cryptographic Algorithm, and Secret Key.