Digital Signatures using Public Key Cryptography
Explore how digital signatures combine public key cryptography and hashing to verify message origin and integrity. Understand how private and public keys secure communication and ensure data is untampered, forming a critical foundation for blockchain technology.
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Let’s continue with the previous example. Where Bob receives a message, which when he decrypts says “Meet me at 11:00 tomorrow”. How can Bob know for sure that the message was sent by Alice and not Chris?
This can be achieved if the message is “signed” by its sender (Alice). The receiver of the message can then verify the signatures.
We need a way for Alice to “digitally sign” the message so the receiver of the message (Bob) can trust that the message was sent by Alice. Alice can add a digital ...