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Exploring Public Key Encryption and Digital Signatures: Secure Communication in Cybersecurity

Discover how public key encryption and digital signatures secure communications. Ken Coder sends Dee a secret message protected by encryption, ensuring only she can unlock it. With innovative ideas like locking one box inside another, public and private keys play a crucial role. This system also allows legal validity, as documents signed digitally became legally binding in the US in 2000. Explore the implications of digital signatures in modern cybersecurity and the inherent trust they establish in electronic communications.

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Exploring Public Key Encryption and Digital Signatures: Secure Communication in Cybersecurity

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  1. Public Key Encryption 3 Digital Signatures or The Box within a Box

  2. Ken Coder sends Dee a secret message only she can unlock.

  3. It could have come from Pre Tender! Yves Dropper's evil cousin

  4. Ken's idea: Lock with my private key

  5. Unlock with my public key: Only I could have sent it!

  6. But Pre Tender can still read it.

  7. Dee's Idea: Lock your box in a second one using my public key.

  8. Only Ken can send it, and only Dee can read it!

  9. Digital Signatures • In any public key cryptosystem, one can implement digital signatures. • To send a signed message M from A to B using keys AE, AD, BE, BD: A sends cyphertext C = BE(AD(M)) B recovers text T = AE(BD(C)) T = AE(BD(BE(AD(M)))) = AE(AD(M)) = M A's Private Key B's private key

  10. It's the law • Documents with Digital Signatures became legally binding in the United States in the year 2000.

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