Encryption

The term encryption refers to the process of concealing the true content of a given text by applying a complex mathematical transformation that maps each character to another character. Encrypted text is unreadable and cannot be easily decrypted without the knowledge of a secret piece of information called key. It is an accepted fundamental assumption that the strength of a given encryption scheme should not lie within the details of the applied mathematical algorithm used to encrypt the original text, but rather it should reside entirely in the key.