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A digital code that can be attached to an electronically transmitted message that Like a written signature, the purpose of a digital signature is to guarantee that Signature Standard (DSS) · Cryptography for encryption, digital signatures and A data summary of the information (called a message digest) is created through the use of a hash function (called the Secure Hash Standard, or SHS, and specified in FIPS 180). The data summary is used in conjunction with the DSA algorithm to create the digital signature that is sent with the message. Digital Signature - Learn Internet Technologies in simple and easy steps starting from basic to advanced concepts with examples including Internet Overview, It was introduced in 1991 by the National Institute of Standards and Technology (NIST) as a better method of creating digital signatures. Along with RSA, DSA isDigital Signature is a solution that authenticates the contents of a digital message that has not been altered in transit. Data Encryption Standard, Triple Des, Advanced Encryption Standard, Block Hash functions, Message Authentication, Cryptography Digital signatures, The private key used for signing is referred to as the signature key and the public key as the verification key. Hash value and signature key are then fed to the signature algorithm which produces the digital signature on given hash. Signature is appended to the data and then both are sent to the verifier. To create a digital signature, signing software -- such as an email program -- creates a one-way hash of the electronic data to be signed. The private key is then used to encrypt the hash. The encrypted hash -- along with other information, such as the hashing algorithm -- is the digital signature. The ElGamal signature scheme is a digital signature scheme which is based on the difficulty of computing discrete logarithms. It was described by Taher