 We propose a new approach for improving the security of quantum key distribution protocols by encrypting classical communication related to error correction. This reduces the amount of information available to the eavesdropper, which can be used to increase the security of the protocol. Our proposal is similar to the quantum data locking, QDL, technique, but differs in its assumptions regarding the eavesdropper's quantum memory coherence time. This article was authored by Valeria A. Pastoschenko and Dmitri A. Kromburg.