Support sufficiency as action-sufficient compression: a single-cycle rate-regret formulation

Collection of new information-theory and applied-math preprints with several papers that have direct privacy/security relevance. Key items: (1) “Equation Asymmetry” proposes a single parameter (EAD) unifying secrecy and covertness across finite-field and Gaussian regimes, proves secrecy capacities/strong converse results, and claims post‑quantum security based on hardness of underdetermined linear systems; (2) “Secure Aggregation with Top‑K Sparsification” presents an information‑theoretic secure aggregation protocol for decentralized federated learning that supports user dropouts and colluded