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  2. Gold Codes - Wikipedia

    en.wikipedia.org/wiki/Gold_Codes

    Gold Codes. The Gold Code is the launch code for nuclear weapons provided to the President of the United States in their role as commander-in-chief of the armed forces. [1] In conjunction with the nuclear football, the Gold Codes allow the president to authorize a nuclear attack. [2] Gold Codes, as well as a separate nuclear football, are also ...

  3. Digital card - Wikipedia

    en.wikipedia.org/wiki/Digital_card

    The term digital card [1] can refer to a physical item, such as a memory card on a camera, [2] [3] or, increasingly since 2017, to the digital content hosted as a virtual card or cloud card, as a digital virtual representation of a physical card. They share a common purpose: Identity Management, Credit card, Debit card or driver license.

  4. 3-D Secure - Wikipedia

    en.wikipedia.org/wiki/3-D_Secure

    3-D Secure. 3-D Secure is a protocol designed to be an additional security layer for online credit and debit card transactions. The name refers to the "three domains" which interact using the protocol: the merchant/acquirer domain, the issuer domain, and the interoperability domain. [1]

  5. No such thing as a free lunch - Wikipedia

    en.wikipedia.org/wiki/No_free_lunch

    The "free lunch" refers to the once-common tradition of saloons in the United States providing a "free" lunch to patrons who had purchased at least one drink. Many foods on offer were high in salt (e.g., ham, cheese, and salted crackers), so those who ate them ended up buying a lot of beer. Rudyard Kipling, writing in 1891, noted how he.

  6. Luhn algorithm - Wikipedia

    en.wikipedia.org/wiki/Luhn_algorithm

    It is described in U.S. Patent No. 2,950,048, granted on August 23, 1960. The algorithm is in the public domain and is in wide use today. It is specified in ISO/IEC 7812-1. It is not intended to be a cryptographically secure hash function; it was designed to protect against accidental errors, not malicious attacks. Most credit cards and many ...

  7. Unified Social Credit Identifier - Wikipedia

    en.wikipedia.org/wiki/Unified_Social_Credit...

    A Unified Social Credit Identifier is issued to registered companies and other types of organization by the Chinese government. It is "unified" in the sense that it is used both as the business registration number with the State Administration for Market Regulation (SAMR) and as the taxpayer identifier with the State Taxation Administration (STA).