Sixth-generation networks demand robust security under extreme data rates, massive connectivity, and ultra-low latency. Conventional cryptographic methods based on computational assumptions may be insufficient in such environments. This study proposes a cipher-cell-based information-theoretic encryption model that partitions data into elementary units and applies entropy-enhancing transformations to ensure secrecy independent of attacker capability. Analysis shows near-uniform entropy, minimal information leakage, and low overhead, making the approach suitable for secure, ultra-reliable communication in future high-speed 6G systems.