From the course: CompTIA CySA+ (CS0-002) Cert Prep: 4 Software and Systems Security

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Digital signatures

Digital signatures

From the course: CompTIA CySA+ (CS0-002) Cert Prep: 4 Software and Systems Security

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Digital signatures

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- [Instructor] Digital signatures provide an electronic counterpart to physical signatures. Digital signatures use asymmetric cryptography to achieve the goals of integrity, authentication, and nonrepudiation. When the recipient of a digitally signed message verifies that message's signature he or she knows three things. First, that the person owning the public key used to sign the message is actually the person who created the message. That's authentication. Second, that the message was not altered after it was digitally signed by the creator. That's integrity. And finally, that the sender could prove these facts to a third party if necessary. That's nonrepudiation. The use of digital signatures depends upon two important concepts discussed earlier in this course. First, that hash functions are collision-resistant. For a strong hash function you can't find two inputs that produce the same output. Second, that…

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