And, in some systems, OTPs are printed on paper that the user is required to carry. Yet other systems generate OTPs on the server-side and send them to the user using an out-of-band channel such as SMS messaging. Other systems consist of software that runs on the user's mobile phone. Such tokens generate OTPs and show them on a small display. Some systems use hardware OTP tokens carried by the user. OTPs are generally 6-7 characters long and randomness in 6. Algorithm Randomly pick characters from our all possibilities and generate a string of the desired length from it. There are also different ways to make the user aware of the next OTP to use. A one-time password (OTP) is a password that is valid for only one login session or transaction, on a computer system or other digital device. Based on a mathematical algorithm where the new password is based on a challenge (e.g., a random number chosen by the authentication server or transaction details) and/or a counter.
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