digital signature - meaning and definition. What is digital signature
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What (who) is digital signature - definition

MATHEMATICAL SCHEME FOR VERIFYING THE AUTHENTICITY OF DIGITAL DOCUMENTS
Digital signatures; Digitally Signed; Cryptographic signature; Digitally signed; Digital Signature; Signed code; Digital signiture; Digital signature scheme; Adaptive chosen-message attack; Adaptive chosen message attack; Digital signing; Signature (cryptography); Signature (computers); Signature (computing); E-imza; Signature scheme; .sign; Digital key; Digital keys; 🔏; Puncturable signature; Puncturable digital signature; Digitally-signed; Cryptographic signing; Applications of digital signatures
  • Alice signs a message—"Hello Bob!"—by appending a signature computed from the message and her private key.

Bob receives both the message and signature. He uses Alice's public key to verify the authenticity of the signed message.

digital signature         
<cryptography> Extra data appended to a message which identifies and authenticates the sender and message data using public-key encryption. The sender uses a one-way hash function to generate a hash-code of about 32 bits from the message data. He then encrypts the hash-code with his private key. The receiver recomputes the hash-code from the data and decrypts the received hash with the sender's public key. If the two hash-codes are equal, the receiver can be sure that data has not been corrupted and that it came from the given sender. (1995-02-07)
digital signatures         
Digital signature         
A digital signature is a mathematical scheme for verifying the authenticity of digital messages or documents. A valid digital signature, where the prerequisites are satisfied, gives a recipient very high confidence that the message was created by a known sender (authenticity), and that the message was not altered in transit (integrity).

Wikipedia

Digital signature

A digital signature is a mathematical scheme for verifying the authenticity of digital messages or documents. A valid digital signature, where the prerequisites are satisfied, gives a recipient very high confidence that the message was created by a known sender (authenticity), and that the message was not altered in transit (integrity).

Digital signatures are a standard element of most cryptographic protocol suites, and are commonly used for software distribution, financial transactions, contract management software, and in other cases where it is important to detect forgery or tampering.

Digital signatures are often used to implement electronic signatures, which includes any electronic data that carries the intent of a signature, but not all electronic signatures use digital signatures. Electronic signatures have legal significance in some countries, including Canada, South Africa, the United States, Algeria, Turkey, India, Brazil, Indonesia, Mexico, Saudi Arabia, Uruguay, Switzerland, Chile and the countries of the European Union.

Digital signatures employ asymmetric cryptography. In many instances, they provide a layer of validation and security to messages sent through a non-secure channel: Properly implemented, a digital signature gives the receiver reason to believe the message was sent by the claimed sender. Digital signatures are equivalent to traditional handwritten signatures in many respects, but properly implemented digital signatures are more difficult to forge than the handwritten type. Digital signature schemes, in the sense used here, are cryptographically based, and must be implemented properly to be effective. They can also provide non-repudiation, meaning that the signer cannot successfully claim they did not sign a message, while also claiming their private key remains secret. Further, some non-repudiation schemes offer a timestamp for the digital signature, so that even if the private key is exposed, the signature is valid. Digitally signed messages may be anything representable as a bitstring: examples include electronic mail, contracts, or a message sent via some other cryptographic protocol.

Examples of use of digital signature
1. His problem was that he had not received a valid "digital signature" on time, he said.
2. The chip will also have a unique digital signature designed to protect the data from tampering.
3. They groused that their reports had to be accompanied by a "digital signature" before they would be accepted.
4. Topics to be discussed at the the conference are÷ E–Commerce A global perspective and future trends; E–Commerce How to make transition; the importance of e–commerce and its effect on the global economy; the regional gateway (GCC) for e–commerce; the successful experiments in GCC; e–banking, e–payment, digital signature, e–security and e–law.