Cross-plane colour image encryption scheme based on BST model and chaotic map Yuwen Sha, Bo Sun, Xiaomo Cheng, Jun Mou and Linian Wang Eur. Phys. J. Spec. Top., 231 16-17 (2022) 3249-3263 Published online: 16 April 2022 DOI: 10.1140/epjs/s11734-022-00566-x