Extending the “SpaceFlip” cipher defined in the continued application (Ser. No. 16/855,517) to increase the lifespan of the shared secret key, and avoid the need for key replacement; applicable to Internet of Things devices where re-access is prohibitive, adding convenience to normal secure communication; extending the use of the SpaceFlip quantum safe cryptography. Applying key equivocation cryptography where several keys are interchangeable.