C # Programming Summary (eight) digital signature

In the daily work, there are many documents need to lead the review, signature and seal, as the company's business development, Cross-border, cross-border business is increasingly common, the leadership signature seal became very troublesome, the beginning of people by mail, fax and other means to solve, but time-consuming, human and material resources. Increasingly deep in the network today, the need for leadership approval, signed and stamped more and more things, time is more and more urgent, digital signature appears, very good to solve this problem. Promote the Internet and the development of transnational groups.

Digital signatures

1. Concept

The digital signature is based on the hashing algorithm and the public key encryption algorithm, the hash algorithm is used to compute the digest first, then the secret key is used to encrypt the digest, and the obtained value is the digital signature of the original text.

Digital signature (also known as public key digital signature, electronic signature) is a kind of common physical signature written on paper, but it is used in the domain of public key cryptography to identify the method of digital information.

A set of digital signatures usually defines two complementary operations, one for signature and the other for verification.

The use of an electronic signature can be represented by the following figure:

2. Working principle

The flowchart is as follows: