Patent ID: 8840018

Claim:
A method comprising: receiving a bit sequence at a first time; determining from a database a first bit sequence, wherein the database stores a plurality of time periods, including a first time period and a second time period, and further stores a plurality of bit sequences, including a first bit sequence and a second bit sequence, wherein the database associates the time periods with respective bit sequences, the first time period having the first bit sequence associated therewith and the second time period having the second bit sequence associated therewith, wherein the database further stores a user identifier, and associates the first and second bit sequences with the identifier, and wherein determining the first bit sequence comprises determining that the first time falls within the first time period, and determining from the database that the first bit sequence is associated with the first time period; comparing the bit sequence to the first bit sequence; permitting an activity if the bit sequence matches the first bit sequence; receiving another bit sequence at a second time; determining from the database the second bit sequence, wherein determining the second bit sequence comprises determining that the second time falls within the second time period, and determining from the database that the second bit sequence is associated with the second time period; comparing the another bit sequence to the second bit sequence; and permitting an activity if the another bit sequence matches the second bit sequence.