Question

On a written check, confirming authenticity (the signatures) and judging authenticity (a third-party handwriting expert’s analysis) are two distinct properties. Explain how these two properties are implemented for a digital signature.

(Computer Security II)

Answer 1

Digital signature is can be used to validate any document, message, software or bank checks.The digital form of a physical signature, a digital-signature offers more security and is meant to solve problems of tampering and impersonation in digital communications.

Digital-signatures is primarily based on public key cryptography. Using a public key algorithm (eg. RSA) two keys pairs are generated that are mathematically linked: one-private and one-public. The person who is creating the digital signature uses his own private-key to encrypt signature-related data; the only way to decrypt that data is with the signer's public-key. This is how digital signatures are authenticated.

In this manner the confirming authenticity (the signatures) and judging authenticity (a third-party handwriting expert’s analysis) which are two distinct properties is implemented for a digital signature.

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