Which of the following BEST describes a digital signature?
A password-based authentication mechanism
A cryptographic value created using the sender's private key
A method to encrypt sensitive data using the recipient's public key
A unique identifier assigned to digital documents
The correct answer is A cryptographic value created using the sender's private key. A digital signature is a cryptographic value generated by applying a private key to a message digest of the original data. This process creates a unique signature that can be verified using the corresponding public key, providing authentication, non-repudiation, and integrity.
A method to encrypt sensitive data using the recipient's public key is incorrect because this describes asymmetric encryption for confidentiality, not digital signatures.
A unique identifier assigned to digital documents is incorrect because a unique identifier may be part of document management but isn't a digital signature.
A password-based authentication mechanism is incorrect because this is a different authentication mechanism not directly related to digital signatures.
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