challenge verification

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• Challenge 21 — is a scheme in the United Kingdom introduced by the British Beer and Pub Association (BBPA) aimed at preventing young people gaining access to age restricted products including cigarettes and alcohol.[1] Under the scheme, customers attempting to… …   Wikipedia

• Challenge (Scrabble) — In the game of Scrabble, a challenge is the act of one player questioning the validity of one or more words formed by another player in the most recent turn. If one or more of the challenged words is not in the previously agreed upon dictionary,… …   Wikipedia

• Challenge–response spam filtering — This article is about e mail. For other uses, see Challenge response authentication. A challenge–response (or C/R) system is a type of spam filter that automatically sends a reply with a challenge to the (alleged) sender of an incoming e mail. In …   Wikipedia

• Challenge-response spam filtering — A Challenge response (or C/R) system is a type of spam filter that automatically sends a reply with a challenge to the (alleged) sender of an incoming e mail. In this reply, the sender is asked to perform some action to assure delivery of the… …   Wikipedia

• Challenge-Handshake Authentication Protocol — In computing, the Challenge Handshake Authentication Protocol (CHAP) authenticates a user or network host to an authenticating entity. That entity may be, for example, an Internet service provider. CHAP is specified in RFC 1994. CHAP provides… …   Wikipedia

• Challenge-handshake authentication protocol — In computing, the Challenge Handshake Authentication Protocol (CHAP) authenticates a user or network host to an authenticating entity. That entity may be, for example, an Internet access provider. RFC 1994: PPP Challenge Handshake Authentication… …   Wikipedia

• College Puzzle Challenge — is an annual puzzlehunt hosted by Microsoft, inspired by the Microsoft Puzzle Hunt or the MIT Mystery Hunt. However, several key features differentiate College Puzzle Challenge from these events. College Puzzle Challenge is a timed event, and… …   Wikipedia

• Self-verification theory — For self testing in electronics, see built in self test Self verification is a social psychological theory that asserts people want to be known and understood by others according to their firmly held beliefs and feelings about themselves, that is …   Wikipedia

• Formal verification — In the context of hardware and software systems, formal verification is the act of proving or disproving the correctness of intended algorithms underlying a system with respect to a certain formal specification or property, using formal methods… …   Wikipedia

• Nintendo Campus Challenge — was a video game competition sponsored by Nintendo and held at nearly 60 college campuses throughout the United States. There were two Campus Challenge events, one in 1991 and another in 1992. Contents 1 Games 2 Cartridge 3 Reproduction …   Wikipedia

• Anti-spam techniques — To prevent e mail spam (aka unsolicited bulk email), both end users and administrators of e mail systems use various anti spam techniques. Some of these techniques have been embedded in products, services and software to ease the burden on users… …   Wikipedia