From the course: CompTIA Security+ (SY0-701) Cert Prep: 1 General Security Concepts
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Digital signatures
From the course: CompTIA Security+ (SY0-701) Cert Prep: 1 General Security Concepts
Digital signatures
Digital signatures provide an electronic counterpart to physical signatures. Digital signatures use asymmetric cryptography to achieve the goals of integrity, authentication, and non-repudiation. When the recipient of a digitally signed message verifies that messages signature, they know three things. First, that the person owning the public key used to sign the message is actually the person who signed the message. That's authentication. Second, that the message was not altered after being signed. That's integrity. And finally, that the recipient can prove these facts to a third party if necessary. That's non-repudiation. 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 anything encrypted with one key from an asymmetric key pair may only be decrypted with the other key from that pair. Up…
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Trust models2m 52s
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PKI and digital certificates4m 5s
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Hash functions7m 38s
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Digital signatures3m 50s
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Digital signature standard1m 27s
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Create a digital certificate4m 55s
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Revoke a digital certificate1m 28s
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Certificate stapling2m 29s
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Certificate authorities6m 13s
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Certificate subjects3m 35s
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Certificate types2m 55s
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Certificate formats2m 30s
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