  Quantum key distribution (QKD) is a quantum-proof key-exchange scheme which
is fast approaching the communication industry. An essential component in QKD
is the information reconciliation step, which is used for correcting the
quantum-channel noise errors. The recently suggested blind reconciliation
technique, based on low-density parity-check (LDPC) codes, offers remarkable
prospectives for efficient information reconciliation without an a priori error
rate estimation. We suggest an improvement of the
blind-information-reconciliation protocol promoting a significant increase in
the efficiency of the procedure and reducing its interactivity. The proposed
technique is based on introducing symmetry in operations of parties, and the
consideration of results of unsuccessful belief-propagation decodings.
