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  2. Tax deduction at source - Wikipedia

    en.wikipedia.org/wiki/Tax_deduction_at_source

    Tax deduction at source. Tax deduction at source (TDS) is an Indian withholding tax that is a means of collecting tax on income, dividends, or asset sales by requiring the payer (or legal intermediary) to deduct tax due before paying the balance to the payee (and the tax to the revenue authority). Under the Indian Income Tax Act of 1961, income ...

  3. Tax Deduction and Collection Account Number - Wikipedia

    en.wikipedia.org/wiki/Tax_Deduction_and...

    Tax Deduction and Collection Account Number. In India, a Tax Deduction and Collection Account Number ( TAN) is a 10 digit alpha-numeric number issued by the Income Tax Department to the persons who are required to deduct or collect tax on payments made by them under the Indian Income Tax Act, 1961. [1]

  4. Certified reference materials - Wikipedia

    en.wikipedia.org/wiki/Certified_reference_materials

    Certified reference materials ( CRMs) are 'controls' or standards used to check the quality and metrological traceability of products, to validate analytical measurement methods, or for the calibration of instruments. [1] A certified reference material is a particular form of measurement standard . Reference materials are particularly important ...

  5. Certificate authority - Wikipedia

    en.wikipedia.org/wiki/Certificate_authority

    Certificate authority. In cryptography, a certificate authority or certification authority ( CA) is an entity that stores, signs, and issues digital certificates. A digital certificate certifies the ownership of a public key by the named subject of the certificate. This allows others (relying parties) to rely upon signatures or on assertions ...

  6. Certificate of analysis - Wikipedia

    en.wikipedia.org/wiki/Certificate_of_analysis

    Certificate of analysis. A certificate of analysis (COA) is a formal laboratory-prepared document that details the results of (and sometimes the specifications and analytical methods for) one or more laboratory analyses, signed—manually or electronically—by an authorized representative of the entity conducting the analyses.

  7. X.509 - Wikipedia

    en.wikipedia.org/wiki/X.509

    In cryptography, X.509 is an International Telecommunication Union (ITU) standard defining the format of public key certificates. [1] X.509 certificates are used in many Internet protocols, including TLS/SSL, which is the basis for HTTPS, [2] the secure protocol for browsing the web. They are also used in offline applications, like electronic ...

  8. Extended Validation Certificate - Wikipedia

    en.wikipedia.org/.../Extended_Validation_Certificate

    An Extended Validation Certificate ( EV) is a certificate conforming to X.509 that proves the legal entity of the owner and is signed by a certificate authority key that can issue EV certificates. EV certificates can be used in the same manner as any other X.509 certificates, including securing web communications with HTTPS and signing software ...

  9. Verification and validation - Wikipedia

    en.wikipedia.org/wiki/Verification_and_validation

    Verification and validation. Verification and validation (also abbreviated as V&V) are independent procedures that are used together for checking that a product, service, or system meets requirements and specifications and that it fulfills its intended purpose. [1] These are critical components of a quality management system such as ISO 9000.