Other non-cryptographic protocols Ĭhallenge-response protocols are also used to assert things other than knowledge of a secret value. In the real world, the algorithm would be much more complex.) Bob issues a different challenge each time, and thus knowing a previous correct response (even if it is not "hidden" by the means of communication used between Alice and Bob) is of no use. (The correct response might be as simple as "63x83z", with the algorithm changing each character of the challenge using a Caesar cipher. The "fit" is determined by an algorithm agreed upon by Bob and Alice. Alice must respond with the one string of characters which "fits" the challenge Bob issued. Bob issues a challenge, perhaps "52w72y". Say Bob is controlling access to some resource. For added security, each set of codes is only valid for a particular time period which is ordinarily 24 hours.Ī more interesting challenge-response technique works as follows. TRIAD includes a list of three-letter challenge codes, which the verifier is supposed to choose randomly from, and random three-letter responses to them. military uses the AKAC-1553 TRIAD numeral cipher to authenticate and encrypt some communications. Assuming that the passwords are chosen independently, an adversary who intercepts one challenge-response message pair has no clues to help with a different challenge at a different time.įor example, when other communications security methods are unavailable, the U.S. The verifier can then present an identifier, and the prover must respond with the correct password for that identifier. One solution is to issue multiple passwords, each of them marked with an identifier. The simplest example of a challenge-response protocol is password authentication, where the challenge is asking for the password and the valid response is the correct password.Īn adversary who can eavesdrop on a password authentication can then authenticate itself by reusing the intercepted password. In computer security, challenge-response authentication is a family of protocols in which one party presents a question ("challenge") and another party must provide a valid answer ("response") to be authenticated. Please help improve this article by introducing citations to additional sources.įind sources: "Challenge–response authentication" – news Relevant discussion may be found on the talk page. The computer will restart, and load Windows, without requesting a password.This article relies largely or entirely on a single source. The BIOS should respond with "Are You Sure?". The BIOS should respond with "Password= Not Registered".Ħ. The BIOS should respond with "Verify Password= ".ĥ. The BIOS should respond with "New Password = ".Ĥ. Press the spacebar to change "Password= Registered" to "Password= ".ģ. Follow these steps to de-register the password:ġ. The BIOS / CMOS Setup screen should appear. The Response Code correct your Laptop will shown the image below : Enter the Response Code at the "Response Code=" prompt, and press Enter. At the BIOS password prompt ("PASSWORD = "), press and release the following keys, one after another:Ĭhallenge Code=XXXXX XXXXX XXXXX XXXXX XXXXXģ. The Challenge Code issued by the BIOS is only valid until the computer is turned off and back on.ġ. īe sure to keep the computer powered-on during this entire procedure. Follow this procedure to delete a BIOS password using the Response Code method.
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