Discussion
Which of the following is an electronic, encrypted stamp of authentication on digital information such as e-mail messages, macros or electronic documents ? Select the most accurate option.
Answer: A
It is a digital signature.
A digital signature uses public-key cryptography: the signer's private key encrypts a hash of the document or message, and anyone with the public key can verify that it came from the signer and has not been altered. It is used to authenticate e-mail, macros and electronic documents, and is legally recognised in India under the IT Act.
Encryption on its own hides content but does not prove who sent it, a hash function only produces a fingerprint of the data, and compression reduces file size. A digital signature combines hashing and encryption for authentication.
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