MUMBAI, India, Jan. 23 -- Intellectual Property India has published a patent application (202641001770 A) filed by Andhra University, Visakhapatnam, Andhra Pradesh, on Jan. 7, for 'a lightweight encryption method employing symbolic character transformation and dynamic directional bit diffusion.'
Inventor(s) include Mr. T. Sri Siva Ramayya; Dr. D. Lalitha Bhaskari; and Dr. M. Raja Mani.
The application for the patent was published on Jan. 23, under issue no. 04/2026.
According to the abstract released by the Intellectual Property India: "The current invention reveals a lightweight, loosely-programmable cryptographic architecture to provide the security of textual communication in resource-constrained systems like the Internet of Things (IoT) devices, embedded devices and low-power communication platforms. The framework proposes a multi-layer transformation pipeline based on symbolic-numeric abstraction, Unicode index mapping, fixed length binary expansion and key-controlled diffusion to produce secure ciphertext with minimum computational cost. Plaintext characters are initially encoded through a symbolic-numeric encoding mechanism in accordance with the invention, then addressed to Unicode index, causing there to be no direct semantic association between plaintext and ciphertext, instead the plaintext and ciphertext being represented by a standardized intermediate form. These coded bits are then transformed into fixed length binary bits and then multi-directional bit diffusion processes using dynamically computed symmetric keys and it leads to high confusion and diffusion properties. The suggested model has a strong avalanche effect and slight modifications in the plaintext or encryption keys create drastic and randomized differences in the ciphertext. The invention relies on efficient integer and bitwise operations, which make it an appropriate tool in secure communication in the limited hardware setup as well as provide greater resistance to cryptanalytic attacks and flexible software, firmware and hardware implementation."
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