signaturesdigital

Digital signatures are a cryptographic method used to verify the authenticity and integrity of digital documents or messages. They provide a way to ensure that a document has not been tampered with after it was signed and that the signature genuinely belongs to the purported sender. This is achieved through the use of public-key cryptography. A sender uses their private key to create a digital signature, which is a unique string of data attached to the document. A recipient can then use the sender's corresponding public key to verify the signature. If the signature is valid, it confirms that the document originated from the owner of the private key and has not been altered. Digital signatures are crucial for secure online transactions, e-commerce, legal documents, and any situation where trust and verification in the digital realm are paramount. They are often implemented using algorithms like RSA or Elliptic Curve Digital Signature Algorithm (ECDSA). The process involves hashing the document to create a digest, and then encrypting that digest with the sender's private key to produce the signature.