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Decryption is the process of converting ciphertext (encrypted data) into plaintext (unencrypted data) using a secret key. The key is used to reverse the transformation that was applied to the data during the encryption process, making it readable again.

Decryption is the reverse process of encryption, and it is used to retrieve the original plaintext message from an encrypted message. Decryption is typically only possible for the intended recipient of the message, as they have access to the secret key that is needed to decrypt the message.