Digital Signature and Digital Envelope

Abstract

Now that we’ve covered the simple cryptographic primitives, its time to build more complex things using those primitives. The first of those is a digital signature, which provides message integrity, detection of tampering and non-repudiation. This is created using a hash function and asymmetric cryptography. The second of these is a digital envelope that provides privacy. This is created using symmetric key cryptography and asymmetric key cryptography.