Traducción y análisis de palabras por inteligencia artificial ChatGPT
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- etimología
Qué (quién) es auxiliary response - definición
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Wikipedia
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.
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.
An adversary who can eavesdrop on a password authentication can then authenticate itself by reusing the intercepted password. One solution is to issue multiple passwords, each of them marked with an identifier. The verifier can then present an identifier, and the prover must respond with the correct password for that identifier. 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.
For example, when other communications security methods are unavailable, the U.S. military uses the AKAC-1553 TRIAD numeral cipher to authenticate and encrypt some communications. 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. For added security, each set of codes is only valid for a particular time period which is ordinarily 24 hours.
A more interesting challenge–response technique works as follows. Say Bob is controlling access to some resource. Alice comes along seeking entry. Bob issues a challenge, perhaps "52w72y". Alice must respond with the one string of characters which "fits" the challenge Bob issued. The "fit" is determined by an algorithm agreed upon by Bob and Alice. (The correct response might be as simple as "63x83z", with the algorithm changing each character of the challenge using a Caesar cipher). 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.
