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Pseudorandom number generator, stream encryption method, and stream encrypting communication method

  • US 6,788,787 B1
  • Filed: 02/24/2000
  • Issued: 09/07/2004
  • Est. Priority Date: 02/25/1999
  • Status: Expired due to Fees
First Claim
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1. A pseudorandom number generator comprising:

  • a one dimensional mapping circuit for generating chaos having non-linear input-output characteristics;

    an AD converter for converting an analog output of the one dimensional mapping circuit;

    a sample-and-hold circuit for holding and outputting a digitally converted value from the AD converter in response to an external clock; and

    a DA converter for outputting an analog converted value in response to the output of the sample-and-hold circuit as feedback to the one dimensional mapping circuit, wherein quantizing divisions of at least one of the AD converter and the DA converter are made non-linear, and further wherein a binary stream is output responsive to the output of the sample-and-hold circuit.

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