Method and Apparatus for Detection of Loss of Cipher Synchronization
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Abstract
Detecting loss of stream cipher synchronization between a transmitter and a receiver in a video processing system may be achieved by receiving, by the receiver, an encrypted video frame from the transmitter, obtaining an encrypted value for a selected pixel in the encrypted video frame, decrypting the encrypted pixel value using a first portion of the receiver'"'"'s current key stream, re-encrypting the pixel value using a second portion of the receiver'"'"'s current key stream, sending the re-encrypted pixel value from the receiver to the transmitter, obtaining, by the transmitter, a plaintext value for the selected pixel from a corresponding original video frame and encrypting the plaintext pixel value using a second portion of the transmitter'"'"'s current key stream, and comparing the re-encrypted pixel value received from the receiver with the encrypted pixel value generated by the transmitter and detecting a loss of cipher synchronization when the values do not match.
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Citations
37 Claims
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1-17. -17. (canceled)
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18. A method for of detecting loss of stream cipher synchronization between a transmitter and a receiver in a video processing system, the method comprising:
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transmitting an encrypted video frame from the transmitter to the receiver;
receiving, at the transmitter, a re-encrypted pixel value from the receiver;
obtaining, at the transmitter, a plaintext value for a selected pixel from an original video frame, wherein the original video frame corresponds to the encrypted video frame, and wherein the selected pixel corresponds to the re-encrypted pixel value received from the receiver;
encrypting the plaintext value for the selected pixel into a new encrypted value; and
detecting, at the transmitter, loss of stream cipher synchronization, based at least in part on (a) the re-encrypted pixel value received from the receiver and (b) the new encrypted value. - View Dependent Claims (19, 20, 21, 22)
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23. A method for of detecting loss of stream cipher synchronization between a transmitter and a receiver in a video processing system, the method comprising:
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receiving, by the receiver, an encrypted video frame from the transmitter;
obtaining an encrypted value for a selected pixel in the encrypted video frame;
decrypting the encrypted pixel value using a current key stream of the receiver;
re-encrypting the pixel value; and
sending the re-encrypted pixel value from the receiver to the transmitter, to enable the transmitter to detect loss of stream cipher synchronization, based at least in part on the re-encrypted pixel value from the receiver. - View Dependent Claims (24, 25, 26, 27, 28)
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29. An apparatus for a video processing system, the apparatus comprising:
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a transmitter adapted to perform operations comprising;
transmitting an encrypted video frame to a receiver;
after transmitting the encrypted video frame to the receiver, receiving a re-encrypted pixel value from the receiver;
obtaining a plaintext value for a selected pixel from an original video frame, wherein the original video frame corresponds to the encrypted video frame, and wherein the selected pixel corresponds to the re-encrypted pixel value received from the receiver;
encrypting the plaintext value for the selected pixel into a new encrypted value; and
detecting loss of stream cipher synchronization with the receiver, based at least in part on (a) the re-encrypted pixel value received from the receiver and (b) the new encrypted value. - View Dependent Claims (30, 31)
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32. An apparatus for a video processing system, the apparatus comprising:
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a receiver adapted to perform operations comprising;
receiving an encrypted video frame from a transmitter;
obtaining an encrypted value for a selected pixel in the encrypted video frame;
decrypting the encrypted pixel value using a current key stream of the receiver;
re-encrypting the pixel value; and
sending the re-encrypted pixel value to the transmitter, to enable the transmitter to detect loss of stream cipher synchronization based at least in part on the re-encrypted pixel value from the receiver. - View Dependent Claims (33, 34)
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35. A method for of detecting loss of stream cipher synchronization between a transmitter and a receiver in a video processing system, the method comprising:
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transmitting an encrypted video frame from the transmitter to the receiver;
receiving, at the transmitter, a decrypted pixel value from the receiver;
obtaining, at the transmitter, a plaintext value for a selected pixel from an original video frame, wherein the original video frame corresponds to the encrypted video frame, and wherein the selected pixel corresponds to the decrypted pixel value received from the receiver; and
detecting, at the transmitter, loss of stream cipher synchronization, based at least in part on (a) the decrypted pixel value received from the receiver and (b) the plaintext value for the selected pixel. - View Dependent Claims (36, 37)
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Specification