For passwords generated by a process that randomly selects a string of symbols of length, "L", from a set of "N" possible symbols, the number of possible passwords can be found by raising the number of symbols to the power "L", i.e. "N""L". Increasing either "L" or "N" will strengthen the generated password. The strength of a random password as measured by the information entropy is just the base-2 logarithm or log2 of the number of possible passwords, assuming each symbol in the password is produced independently. Thus a random password's information entropy, "H", is given by the formula: