Another word for this is to 'decypher' the message.
Decryption is the reverse of 'encryption'. With encryption, information, for instance in the form of digital data, can be scrambled so an unauthorised person cannot see its content. For example passwords are usually encrypted. Encryption works by applying some complicated mathematics to the original message. The message is scrambled mathematically by a secret 'key'.
For example a plain text message might be
and encrypted it might look like
To get back to the original message, the code must be 'decrypted'. The secret key is applied once again but in reverse, so the original, decrypted message is created.
A good encryption \ decryption method must make it very, very difficult to work out the key. For example 'bcrypt' is a very strong encryption system that uses a 448 bit key.
Challenge see if you can find out one extra fact on this topic that we haven't already told you
Click on this link: Decryption