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Method for the secure unindirectional transmission of signals

  • US 9,628,278 B2
  • Filed: 02/14/2011
  • Issued: 04/18/2017
  • Est. Priority Date: 03/11/2010
  • Status: Expired due to Fees
First Claim
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1. A method for transmitting a signal via a unidirectional communications link, protected by an asymmetric cryptography method, comprising:

  • incrementing, at a transmitter, a counter value, the counter value being incremented based on occurrence of a transmission procedure;

    determining, at the transmitter, a challenge based on the counter value and a control command executable by a receiver;

    determining, at the transmitter, a response based on the challenge using a private key of the asymmetric cryptography method;

    deriving an integrity key at the transmitter based on the response, and generating a cryptographic checksum with the integrity key via the challenge to protect the integrity of the challenge; and

    transmitting the challenge, the cryptographic checksum, and the response, from the transmitter to the receiver.

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