This special issue is dedicated to security problems in wireless and quantum communications.Papers for this issue were invited,and after peer review,eight were selected for publication.The first part of this issue comprises four papers on recent advances in physical layer security for wireless networks.The second part comprises another four papers on quantum This special issue is dedicated to security problems in wireless and quantum communications. Papers for this issue were invited, and after peer review, eight were selected for publication. First part of this issue incorporated four papers on recent advances in physical layer security for wireless networks. The second part contains another four papers on quantum