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The Employer Identification Number (EIN), also known as the Federal Employer Identification Number (FEIN) or the Federal Tax Identification Number (FTIN), is a unique nine-digit number assigned by the Internal Revenue Service (IRS) to business entities operating in the United States for the purposes of identification.
ISO 3166-2 is part of the ISO 3166 standard published by the International Organization for Standardization (ISO), and defines codes for identifying the principal subdivisions (e.g., provinces or states) of all countries coded in ISO 3166-1.
A value-added tax identification number or VAT identification number (VATIN [1]) is an identifier used in many countries, including the countries of the European Union, for value-added tax purposes.
The CPF number (Cadastro de Pessoas Físicas, ; Portuguese for "Natural Persons Register") is the Brazilian individual taxpayer registry, since its creation in 1965. [1] This number is attributed by the Brazilian Federal Revenue to Brazilians and resident aliens who, directly or indirectly, pay taxes in Brazil.
The ElGamal signature scheme is a digital signature scheme which is based on the difficulty of computing discrete logarithms.It was described by Taher Elgamal in 1985. [1]The ElGamal signature algorithm is rarely used in practice.
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.
Parameter; CURVE: the elliptic curve field and equation used G: 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 =, where is the identity element.
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.