What does CR stand for?

involves the use of a challenge-response technique at the point of sale.

The service uses challenge-response authentication to prevent common phishing and man-in-the-middle attacks.

The service uses challenge-response authentication to ensure security.

One of the latest anti-spam advances are "challenge-response" programs, which are designed to prevent delivery of an e-mail that the challenge-response program deems suspicious unless and until the sender performs a task easily performed by humans but not by computers.

The technological solutions range from whitelists and challenge-response (in which an automated message is sent to the sender of an e-mail asking that user to reply or perform some action to verify that it is a legitimate message from an individual, not an automated bulk e-mail program) to bonded sender programs where legitimate bulk e-mailers post a bond to guarantee that they are not sending unsolicited messages.

A token is a physical device capable of storing a secret value, and processing that secret value with a cryptographic function in accordance with a challenge-response protocol.

The Authentify process is the perfect way to eliminate fraudulent online registrations, because it engages the person opening the account in real-time using a quick, intuitive challenge-response mechanism," said Authentify CEO Peter Tapling.

Laptop BIOS resets typically involve a call to a vendor and going through a challenge-response process before reset codes are handed out.