Random number generator and generation method
First Claim
1. A random number generator comprising:
- a computer having a parallel port, said parallel port including data and control lines;
a random number generator circuit for producing a random sequence of signals, said random number generator circuit including power supply means for powering said circuit from power supplied by one or more of the data and control lines of said parallel port; and
electrical connecting means for transferring power from said computer to said power supply means via said parallel port and for communicating signals generated by said random number generator circuit to said computer through said parallel port.
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Accused Products
Abstract
An RNG circuit is connected to the parallel port of a computer. The circuit includes a flat source of white noise and a CMOS amplifier circuit compensated in the high frequency range. A low-frequency cut-off is selected to maintain high band-width yet eliminate the 1/f amplifier noise tail. A CMOS comparator with a 10 nanosecond rise time converts the analog signal to a binary one. A shift register converts the serial signal to a 4-bit parallel one at a sample rate selected at the knee of the serial dependence curve. Two levels of XOR defect correction produce a BRS at 20 kHZ, which is converted to a 4-bit parallel word, latched and buffered. The entire circuit is powered from the data pins of the parallel port. A device driver interface in the computer operates the RNG. The randomness defects with various levels of correction and sample rates are calculated and the RNG is optimized before manufacture.
94 Citations
7 Claims
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1. A random number generator comprising:
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a computer having a parallel port, said parallel port including data and control lines;
a random number generator circuit for producing a random sequence of signals, said random number generator circuit including power supply means for powering said circuit from power supplied by one or more of the data and control lines of said parallel port; and
electrical connecting means for transferring power from said computer to said power supply means via said parallel port and for communicating signals generated by said random number generator circuit to said computer through said parallel port. - View Dependent Claims (2, 3, 4)
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5. A random number generator system comprising:
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a computer including a power source producing a first voltage of one sign;
a charge pump for producing a second voltage of the opposite sign to said first voltage; and
a random number generator circuit powered by said first and second voltages for generating a random sequence of signals. - View Dependent Claims (6, 7)
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Specification