An improved QKD protocol without public announcement basis using periodically derived basis

Bases selection with pseudo-random functions in BB84 scheme

“…This is because of an additional drawback where light pulses in practical single-photon sources may contain more than one photon [58] . Using the PNS attack on the Hwang protocol, after 50 reuses, one can obtain all of the basis's information without being detected [55] . To overcome these limitations, the basis sequence cannot be arbitrarily long, since this would result in a protocol that uses more secret key material than it produces.…”

“…To overcome these limitations, the basis sequence cannot be arbitrarily long, since this would result in a protocol that uses more secret key material than it produces. The most recent method, based on a shift register [55] , is an exception. The memory requirements, however, would be substantial, and there would still be a significant correlation between succeeding generation repetitions.…”

“…Most recently, in [55] improved variant of the Hwang protocol has been proposed in which shift register, filled with secret bits, is used to define the basis sequence. Assuming the key distribution technique yields a secret key of length m , the content of the register is shifted to the left by m bits, and the distributed secret key is appended to the shift register.…”