A digital signature is a mathematical scheme for demonstrating the authenticity of digital messages or documents.
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A valid digital signature gives a recipient reason to believe that the message was created by a known sender, that the sender cannot deny having sent the message, and that the message was not altered in transit.
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Digital signatures are a standard element of most cryptographic protocol suites, and are commonly used for software distribution, financial transactions, contract management software, and in other cases where it is important to detect forgery or tampering.
Contract management software is the range of computer programmes, libraries and data used to support contract management, contract lifecycle management, and contractor management on projects.
A security protocol is an abstract or concrete protocol that performs a security-related function and applies cryptographic methods, often as sequences of cryptographic primitives.
A contract is a voluntary arrangement between two or more parties that is enforceable at law as a binding legal agreement.