What do you mean by digital signature? What are properties a digital signature should have?

Subject Computer and Network Security
NU Year Set: 3.(b) Marks: 1+5=6 Year: 2017

A digital code (generated and authenticated by public key encryption) which is attached to an electronically transmitted document to verify its contents and the sender's identity.

Digital Signature Properties


Abstract
The purpose of this document is to explain specific properties that a digital signature should have. This document also provides an explanation of the differences between direct and arbitrated digital signatures. Lastly this document explains what a suppress-replay attack entails. This document is intended for anybody looking to gain a basic understanding or a general knowledge about different types of digital signatures and vulnerabilities.

Content
When working with computer security, information assurance, information privacy, etc. there may be a time when you may have to deal with digital signatures. It is good to know a little bit about digital signatures including the properties of a digital signature. There may also be a time that you might want to know differences between digital signatures. You may also want to know about security vulnerabilities when dealing with digital signatures. Instead of going out and finding trusted sources for information and then having to research each specific item, you can look no further and find the information you are looking for right here.
There are some properties that a digital signature must have in order to serve its purpose. A digital signature must be authentic (Leiwo, 2003). This means that person who signed the document deliberately did so. A digital signature must be unforgeable. This means that somebody else cannot act on behalf of a person and only the signer is the individual who signed the document. The signed document must be unaltered. This means that after the document was signed, nothing within that document has changed. Digital signatures must not be reusable. This means that after a document has been signed, any part of the document cannot be used elsewhere. Digital signatures cannot be repudiated. This means that once a document is digitally signed, the signer of the document cannot say that they did not sign the document. If any of these properties do not exist for a digital signature the whole digital signature scheme collapses and is essentially unusable. The properties that a digital signature must have pertain to the sender of the document is who they say they are, the receiver of the document is who they say they are and that no part of the document was changed, altered, or allowed to be used at a later point in time.

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