Digital Signature

Overview [1]#

Digital Signature is a mathematical scheme for demonstrating the Authenticity of a digital message or data.
Digital Signature Algorithms and therefore Digital Signature are not Encryption even though they are Cryptographic Primitives

Digital Signature is the output (hash) of a Cryptographic Hash Function when applied to a stream of data.

A valid Digital Signature for a message sent from Alice gives a Bob a high Level Of Assurance to trust that:

Digital Signature are commonly used for Public Key Infrastructure, financial transactions, and in other cases where it is important to detect Authenticity or integrity.[1]

Digital Signatures are based on Public Key cryptography, also known as Asymmetric Key Cryptography

How Digital Signature works#

Digital Signature requires a Digital Signature Algorithm which includes:

Why Hash Function vs Encryption?#

The reason for encrypting the hash instead of the entire message or document is that a Hash Function can convert a Message into a fixed length value, which is usually much shorter and faster and requires less CPU since hashing is much faster than signing.

Digital Signature Algorithms#

Signatures with efficient protocols#

Signatures with efficient protocols are a form of Digital Signaturee invented by Jan Camenisch and Anna Lysyanskaya in 2001. In addition to being secure digital signatures, they need to allow for the efficient implementation of two protocols

More Information#

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