4. Cryptography
  5. Cryptanalysis

Robert B. Graybill

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Apparatus and methods for including codes in audio signals

Cryptography – Electric signal masking
Reexamination Certificate

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Apparatus and methods for including codes in audio signals

Cryptography – Electric signal masking – By signal having discrete frequency component
Reexamination Certificate

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Apparatus and methods for including codes in audio signals

Cryptography – Electric signal masking
Reexamination Certificate

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Apparatus and methods for including codes in audio signals and d

Cryptography – Cryptanalysis
Patent

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Apparatus and methods for including codes in audio signals and d

Cryptography – Cryptanalysis
Patent

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