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One's complement cryptographic combiner

  • US 6,760,440 B1
  • Filed: 12/11/1999
  • Issued: 07/06/2004
  • Est. Priority Date: 12/11/1999
  • Status: Expired due to Term
First Claim
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1. A stream cipher cryptosystem comprising:

  • an encryption pseudo-random number generator receiving a key and providing an encryption keystream;

    an encryption combiner receiving a first plaintext binary data sequence representing a message and the encryption keystream and performing a first one'"'"'s complement operation on the first plaintext binary data sequence and the encryption keystream to provide a ciphertext binary data sequence;

    a decryption pseudo-random number generator receiving the key and providing a decryption keystream; and

    a decryption combiner receiving the ciphertext binary data sequence and the decryption keystream and performing a second one'"'"'s complement operation on the ciphertext binary data sequence and the decryption keystream to produce a second plaintext binary data sequence that represents the message represented by the first plaintext binary data sequence.

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