Pengguna:Nasrie/Bak Pasir

In this example the message is only signed and not encrypted. 1) Alice signs a message with her private key. 2) Bob can verify that Alice sent the message and that the message has not been modified.

Tanda tangan digital atau tanda tangan elektronik adalah skema matematis untuk membuktikan keaslian pesan atau dokumen digital. Tanda tangan digital yang valid memberikan alasan bagi penerima untuk percaya bahwa suatu pesan dibuat oleh pengirim yang jelas/dikenal (otentik), bahwa pengirim tidak dapat menyangkal telah mengirim pesan tersebut (nir-penyangkalan), dan bahwa pesan tidak diubah saat transit (integritas).

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, a broader term that refers to any electronic data that carries the intent of a signature, but not all electronic signatures use digital signatures. In some countries, including the United States, Algeria, Turkey, India, Brazil, Indonesia, Mexico, Saudi Arabia,, Uruguay, Switzerland and the countries of the European Union, electronic signatures have legal significance.

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 seals and signatures are equivalent to handwritten signatures and stamped seals. 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. Digital signatures 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 time stamp 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.