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Consider the following services in network security:
1. Authentication of message
2. Integrity
3. Privacy
4. Non repudiation
Which of the security services is/are not provided by digital signature?

in Computer Networks by (107 points)
edited by | 153 views

2 Answers

+2 votes

 Authentication of the message: Although messages may often include information about the entity sending a message, that information may not be accurate. Digital signatures can be used to authenticate the source of messages. When ownership of a digital signature secret key is bound to a specific user, a valid signature shows that the message was sent by that user. 

Integrity: In many scenarios, the sender and receiver of a message may have a need for confidence that the message has not been altered during transmission. Although encryption hides the contents of a message, it may be possible to change an encrypted message without understanding it. However, if a message is digitally signed, any change in the message after signature invalidates the signature. 

The cryptographic message syntax or XML digital signature are examples.

 Non-repudiation:   It is an important aspect of digital signatures. By this property, an entity that has signed some information cannot at a later time deny having signed it. Similarly, access to the public key only does not enable a fraudulent party to fake a valid signature.

A digital signature alone does not provide confidentiality since it does not prevent disclosure of information you would want to keep secret. Encryption would be an example of a mechanism to provide confidentiality. 

So it doesn't provide privacy

by Boss (10.6k points)
nice explanation for integrity service.
Thankyou, that really explained the bulk of it. One small probably naive doubt is, what are we meaning when we say signed message. I am asssuming a hash which is encrypted with private key of sender
0 votes
I think it does not provide any privacy.
by Junior (895 points)

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