Digital Signature

In short, the so-called digital signature is attached to a unit of data on some of the data, or data on the unit by changing the password. Such data or transform data unit to allow the recipient to identify the source of the data unit and data unit and protect the integrity of the data to prevent people (for example, the recipient) for forgery. It is a form of electronic messages signed a way to sign a message in a communication network transmission. Based on public-key cryptosystem and private key cryptography have access to digital signatures, currently mainly based on public key cryptography digital signature. Including the general and special digital signature digital signature. There are ordinary digital signature algorithm RSA, ElGamal, Fiat-Shamir, Guillou-Quisquarter, Schnorr, Ong-Schnorr-Shamir digital signature algorithm, Des / DSA, Elliptic Curve Digital Signature Algorithm and finite automata, such as digital signature algorithm. A special digital signature blind signature, proxy signature, group signature, the signature can not be denied a fair blind signature, the signature threshold, with a message recovery signature, and so on, and it is closely related to the specific application environments. It is clear that the application of digital signatures the legal issues involved, the U.S. federal government based on the limited domain of the discrete logarithm problem has developed its own Digital Signature Standard (DSS). Some countries such as France and Germany have developed a digital signature law.