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Definition. A digital signature scheme typically consists of three algorithms: A key generation algorithm that selects a private key uniformly at random from a set of possible private keys. The algorithm outputs the private key and a corresponding public key. A signing algorithm that, given a message and a private key, produces a signature.
Digital Signature Algorithm. The Digital Signature Algorithm (DSA) is a public-key cryptosystem and Federal Information Processing Standard for digital signatures, based on the mathematical concept of modular exponentiation and the discrete logarithm problem. In a public-key cryptosystem, two keys are generated: data can only be encrypted with ...
An electronic signature, or e-signature, is data that is logically associated with other data and which is used by the signatory to sign the associated data. [1] [2] [3] This type of signature has the same legal standing as a handwritten signature as long as it adheres to the requirements of the specific regulation under which it was created (e.g., eIDAS in the European Union, NIST-DSS in the ...
Merkle signature scheme. In hash-based cryptography, the Merkle signature scheme is a digital signature scheme based on Merkle trees (also called hash trees) and one-time signatures such as the Lamport signature scheme. It was developed by Ralph Merkle in the late 1970s [1] and is an alternative to traditional digital signatures such as the ...
Structure. Elliptic-curve cryptography. In public-key cryptography, Edwards-curve Digital Signature Algorithm (EdDSA) is a digital signature scheme using a variant of Schnorr signature based on twisted Edwards curves. [1] It is designed to be faster than existing digital signature schemes without sacrificing security.
BLS digital signature. A BLS digital signature, also known as Boneh–Lynn–Shacham[1] (BLS), is a cryptographic signature scheme which allows a user to verify that a signer is authentic. The scheme uses a bilinear pairing , where and are elliptic curve groups of prime order , and a hash function from the message space into .
Qualified electronic signature. A qualified electronic signature is an electronic signature that is compliant with EU Regulation No 910/2014 (eIDAS Regulation) for electronic transactions within the internal European market. [1] It enables to verify the authorship of a declaration in electronic data exchange over long periods of time.
An electronic signature that has been created in compliance with eIDAS has the same legal value as a handwritten signature. [2] An electronic signature, technically implemented based on XAdES has the status of an advanced electronic signature. [4] This means that it is uniquely linked to the signatory; it is capable of identifying the signatory;