decryption
Noun
Meaning
the activity of making clear or converting from code into plain text
Source: WordNetSynonyms
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Examples
a secret key or password is required for decryption
A common misconception is to use inverse order of encryption as decryption algorithm (i.e. first XORing P17 and P18 to the ciphertext block, then using the P-entries in reverse order).
As with any stream cipher, these can be used for encryption by combining it with the plaintext using bit-wise exclusive-or ; decryption is performed the same way (since exclusive-or with given data is an involution ).
A similar procedure is performed for an incoming packet, where IPsec gathers decryption and verification keys from the security association database.
Because the content is encrypted, any changes in the message will result in failure of the decryption with the appropriate key.
Cryptography is the practice and study of hiding (encryption) and therefore deciphering (decryption) information.