Large language models can learn and generalize steganographic chain-of-thought under process supervision - MC CARTHY, ROBERT; SKAF, Joey; Ibanez-Lissen, Luis; Georgiev, Vasil; Watts, Connor; Whittingham, Hannes; Gonzalez-Manzano, Lorena; Tice, Cameron; Young, Edward; Radmard, Puria; Lindner, David (Advances in Neural Information Processing Systems, 2025)