In a theory of quantum gravity, states can be represented as wavefunctionals that assign an amplitude to given configuration matter fields and the metric on spatial slice. These must obey set constraints consequence diffeomorphism invariance theory, most important which is known Wheeler-DeWitt equation. We study these perturbatively by expanding them leading nontrivial order in Newton's constan...

Scrambled Burrows-Wheeler transform [6] is an attempt to combine privacy (encryption) and data compression. We show that the proposed approach is insecure. We present chosen plaintext and known plaintext attacks and estimate their complexity in various scenarios.