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System for encoding encryption/decryption information into IFF challenges

  • US 5,822,430 A
  • Filed: 11/20/1996
  • Issued: 10/13/1998
  • Est. Priority Date: 11/20/1996
  • Status: Expired due to Term
First Claim
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1. An encryption system for producing a binary waveform with a predetermined number of bits, the system including:

  • A. means for formulating and encrypting an m-bit message to produce an m-bit encrypted message;

    B. means for inserting between adjacent bits of the m-bit encrypted message an anti-interference pulse that represents a one if the adjacent bits are two zero-valued bits and represents a zero if the adjacent bits are other than two zero-valued bits;

    C. means for replacing one or more selected anti-interference pulses with a corresponding number of information pulses, the information pulses including information that is used to decipher the encrypted message.

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