ΣΦL Encoding: Physics-Locked Encoding and Encoded-Encoder Closure

This paper presents ΣΦL Encoding, an architecture in which content, protection, and verification collapse into the same object. Instead of encrypting hidden plaintext with a separate key, internal state is represented as derivation chains from physical premises through ΣΦL. Under invariant-preserved decoding, a malformed chain fails verification, while a valid chain is admissible physics-derived content. The paper also introduces encoded-encoder closure: the encoder itself is represented and verified under the same physics-locked structure it enforces. This closes the lens-substitution attack, where corruption of the translator would make downstream derivations faithfully wrong while appearing locally valid.…