In gaming, modification (mod) refers to the process of editing or changing the structure, syntax or code of a game .Modification is performed to change the operations of a game in par with the requirements, environment, or end result or experience.
Challenge-response authentication is a group or family of protocols characterized by one entity sending a challenge to another entity. The second entity must respond with the appropriate answer to be authenticated. A simple example of this is password authentication. The challenge is from a server asking the client for a password to authenticate the client's identity so that the client can be served.
Most smart card systems use challenge-response authentication. These systems require at least two things for authentication and entry: the smart card and the user’s password. Another challenge-response authentication example is the use of CAPTCHA, a form of reverse-Turing test for the system to determine if the client is a human or not. This is used to prevent spam and auto-registration of new accounts for a website or email. Biometric systems are another form of challenge-response authentication. In cryptography, zero-knowledge password proof and key agreement systems such as secure remote password, CRAM-MD5 and secure shell's challenge-response system based on RSA are considered to be very sophisticated challenge-response algorithms.
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