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This allows the user to define different charsets for the OTP to be in. This is incredibly useful for increasing the entropy and time-to-crack when dealing with brute force attacks. When using a substantially larger character set, the increased complexity means, in theory, you could use this as a main form of authentication always rather than relying on a 2FA setup. e.g. 10 digits at length 6 = 1 Million possibilities However, 26 letters + 10 digits at length 6 = 36^6 = 2.1 Billion options. With a rate limitting system, this is practically uncrackable.
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