The following statement about digital signature is true ().
A. the digital signature is credible.
B. the digital signature is undeniable.
C. the digital signature is reproducible.
D. the digital signature is unforgeable.
Correct answer: ABD
Digital signature is a technology that binds information (digital file) with other information (usually identity). It has the following characteristics:
The digital signature is credible. The receiver can verify the validity of the digital signature, thus confirming the integrity and source of the information.
Digital signature is undeniable. The sender can't deny that the information was sent with a digital signature, because the digital signature is based on its private key, and the private key is only owned by the sender.
Digital signatures are not reproducible. Digital signature is based on the sender's private key, and the private key only belongs to the sender, so the digital signature cannot be copied.
Digital signature is unforgeable. Digital signature is based on the sender's private key, and it can only be generated if the sender has the private key, so the digital signature cannot be forged.