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Digital Signatures | Computer Security

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We can use the ideas from public-key encryption to build asymmetric cryptographic schemes that guarantee integrity and authentication too. In this section, we will define digital signatures, which are essentially the public-key version of MACs, and show how they can help guarantee integrity and authentication. Recall that in public-key encryption, anyone could use Bob’s public key to encrypt a message and send it to him, but only Bob could use his secret key to decrypt the message. However, the situation is different for digital signatures. It would not really make sense if everyone could generate a signature on a message and only Bob could verify it. If anyone could generate a signature with a public key, what’s stopping an attacker from generating a malicious message with a valid signature? Instead, we want the reverse: only Bob can generate a signature on a message, and everyone else can verify the signature to confirm that the message came from Bob and has not been tampered with. I

Digital Signatures | Computer Security Skip to main content Menu Expand (external link) Document Search Copy Copied Computer Security 12. Digital Signatures We can use the ideas from public-key encryption to build asymmetric cryptographic schemes that guarantee integrity and authentication too. In this section, we will define digital signatures , which are essentially the public-key version of MACs, and show how they can help guarantee integrity and authentication. 12.1. Digital signature properties Recall that in public-key encryption, anyone could use Bob’s public key to encrypt a message an

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