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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. 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 USA or ...
Checking revocation status requires an "online" check; e.g., checking a certificate revocation list or via the Online Certificate Status Protocol. Very roughly this is analogous to a vendor who receives credit-cards first checking online with the credit-card issuer to find if a given card has been reported lost or stolen.
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. DSA is a variant of the Schnorr and ElGamal signature schemes.
elliptic curve base point, a point on the curve that generates a subgroup of large prime order n. n. integer order of G, means that. n × G = O {\displaystyle n\times G=O} , where. O {\displaystyle O} is the identity element. d A {\displaystyle d_ {A}} the private key (randomly selected)
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.
NTRU. NTRU is an open-source public-key cryptosystem that uses lattice-based cryptography to encrypt and decrypt data. It consists of two algorithms: NTRUEncrypt, which is used for encryption, and NTRUSign, which is used for digital signatures. Unlike other popular public-key cryptosystems, it is resistant to attacks using Shor's algorithm.
Blind signature. In cryptography a blind signature, as introduced by David Chaum, [1] is a form of digital signature in which the content of a message is disguised ( blinded) before it is signed. The resulting blind signature can be publicly verified against the original, unblinded message in the manner of a regular digital signature.
Signal for Help. The Signal for Help (or the Violence at Home Signal for Help) is a single-handed gesture that can be used over a video call or in person by an individual to alert others that they feel threatened and need help. [1] Originally, the signal was created as a tool to combat the rise in domestic violence cases around the world linked ...