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Which statement is true concerning digital signature?

  1. can be used as a cryptosystem and signature system.
  2. a way of encrypting confidential data
  3. a method of sending handwritten signature to digital media
  4. allows the receiver of data to prove the source and integrity
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closed as off-topic by Ella Rose Jan 8 at 22:42

  • This question does not appear to be about cryptography within the scope defined in the help center.
If this question can be reworded to fit the rules in the help center, please edit the question.

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    $\begingroup$ This looks like homework. What have you tried, can you rule out some options, what do you not understand? $\endgroup$ – otus Aug 17 '16 at 5:34
  • $\begingroup$ @otus: Actually, it looks more like a take-home or online exam question to me. Normal homework, at least IME, is rarely multiple-choice. Still not good question for Stack Exchange, IMO. $\endgroup$ – Ilmari Karonen Aug 17 '16 at 9:00
  • $\begingroup$ I'm voting to close this question as off-topic because it is a dump of a homework (or exam) question with no effort shown $\endgroup$ – Ella Rose Jan 8 at 22:42
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Which statement is true concerning digital signature?

  1. can be used as a cryptosystem and signature system.

No. A cryptosystem is generally a system where confidentiality, integrity and authenticity can be achieved.

So a cryptosystem will likely also require things like encryption to obtain confidentiality. And encryption is not available if you just have a signature generation & verification primitive.

Note that signature generation / verification itself is generally a hybrid cryptosystem of a symmetric hash and an asymmetrical computational hard problem such as RSA. But that's something different.

  1. a way of encrypting confidential data

Certainly not. Operations with a private key of the sender cannot be used to obtain confidentiality. For that you need the public key of the receiver.

  1. a method of sending handwritten signature to digital media

Duh, no.

  1. allows the receiver of data to prove the source and integrity

Yes, the receiver can verify that the data was signed by the private key of the sender if the receiver has obtained and trusts the public key of the key pair.

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  • $\begingroup$ Thanks for helping answer this question. I am learning cryptography and trying to understand it. I really appreciate all the help I can get. $\endgroup$ – CryptoXcode Aug 17 '16 at 23:56
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4-so digital signature it allows the receiver of data to prove the source and integrity as well as the Message come from right source

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