Define digital signature. Describe the approaches of DSS.

Question

Suresh Chand · Accepted Answer

A digital signature is a mathematical technique used to validate the authenticity and integrity of a message, software, or digital document. It's the digital equivalent of a handwritten signature or stamped seal, but it offers far more inherent security. A digital signature is intended to solve the problem of tampering and impersonation in digital communications. Types of Digital Signature: Electronic signature – This digital signature is usually defined as “data in electronic form which are attached to or logically associated with other electronic data and which serve as a method of authentication”. Advanced electronic signature – means an electronic signature that satisfies a number of additional requirements, including a unique link that is capable of identifying the signatory. An advanced electronic signature guarantees the integrity and authentication of the text. Qualified digital signature – means an advanced electronic signature based on a qualified certificate and is created by a secure signature-creation device. All technical elements used to apply such a digital signature must be of the latest technology. DSS Approach: The DSS approach also makes use of a hash function. The hash code is pro- vided as input to a signature function along with a random number k generated for this particular signature. The signature function also depends on the sender’s private key (PRa) and a set of parameters known to a group of communicating principals. We can consider this set to constitute a global public key (PUG).1 The result is a signature consisting of two components, labeled s, and r. At the receiving end, the hash code of the incoming message is generated. This plus the signature is input to a verification function. The verification function also depends on the global public key as well as the sender’s public key (PUa), which is paired with the sender’s private key. The output of the verification function is a value that is equal to the signature component r if the signature is valid. The signature function is such that only the sender, with knowledge of the private key, could have produced a valid signature.

Define digital signature. Describe the approaches of DSS.

Leave your Answer:

Hits Counter

Question

Define digital signature. Describe the approaches of DSS.

Leave your Answer: