Methods and apparatus for monitoring the integrity of a...

Details Methods and apparatus for monitoring the integrity of a... Methods and apparatus for monitoring the integrity of a...

2005-09-27

2010-12-14

Korzuch, William R (Department: 2431)

Cryptography

Particular algorithmic function encoding

C380S255000, C380S287000

Reexamination Certificate

active

07853011

ABSTRACT:
A transmitter classifies quantum pulses into supervisory pulses and message pulses, and assigns each message pulse to a message bit. Each message pulse is then encoded using a coding base randomly selected from a set of coding bases, and with a polarity relative to the coding base that depends on the value of the corresponding message bit. Supervisory pulses are encoded using a coding base different from the coding bases in the aforementioned set. The encoded pulses are sent to a recipient over a quantum channel. The transmitter also informs the recipient of the positions of the supervisory pulses. The recipient detects the pulses relative to a locally selected coding base, producing a zero-click, a one-click or a two-click. By measuring the received proportion of zero-clicks, one-clicks and two-clicks, for both message pulses and supervisory pulses, and by verifying whether these detection statistics obey certain expected relationships, the recipient can determine whether an attack is taking place on the quantum channel.

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