A digital signature is a mathematical technique used to validate the authenticity and integrity of a message, software, or digital document. It is akin to a handwritten signature or a stamped seal, but it offers far more inherent security.
How Digital Signatures Work
Digital signatures use asymmetric cryptography, also known as public-key cryptography. This involves a pair of keys: a public key and a private key. The public key can be shared with anyone, while the private key is kept secret by the owner.
Steps to Create and Verify a Digital Signature
Creating a Digital Signature: A hash function is applied to the message to create a message digest. The message digest is then encrypted using the sender's private key to form the digital signature. The digital signature is sent along with the message to the receiver.
Verifying a Digital Signature: The receiver decrypts the digital signature using the sender's public key to obtain the message digest. The receiver also computes the message digest from the received message. If both message digests match, the digital signature is valid, ensuring the message's authenticity and integrity
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