A digital signature is impossible to forge, making it more secure than a paper signature. A digital signature provides a guarantee to a recipient that the signed file came from the person who sent it, and that it was not altered since it was signed. A combination of the user's encryption and signing key pairs. Two key pairs are required to satisfy the requirements for non-repudiation and key backup and recovery. Encryption To encrypt a file is to apply a mathematical function that transforms every character in the file into some other character.
Encryption renders the file unreadable.
This means no one, including you, can read the file until it is decrypted. Only you and the authorized recipients can decrypt the file. This consists of the encryption public key and decryption private key. The public key portion of an encryption key pair used to encrypt data which can be decrypted by the matching decryption private key. A federal government standard by which products are measured.