<![CDATA[This study develops and evaluates the PDE-SEC (Partition Dimension--Security) prototype for securing .tex files using vertex representation codes on the cycle graph C256. Each byte value is mapped to a graph vertex and represented using a three-class resolving partition. The representation codes are incorporated into a key-dependent permutation, followed by a SHA-256-based keystream transformation and HMAC-SHA-256 for integrity verification. Experiments were conducted on 15 .tex files using correctness, file size, overhead, encryption and decryption time, throughput, entropy, correlation, avalanche effect, and key sensitivity. All 15 files were successfully recovered. The cumulative original size of 481,582 bytes became 483,502 bytes after encryption, corresponding to 0.3987% aggregate overhead. Total encryption and decryption times were 0.457746 s and 0.752114 s, with aggregate throughputs of 1.0521 MB/s and 0.6403 MB/s, respectively. Mean ciphertext entropy was 7.9815 bit/byte, mean absolute correlation was 0.00739, and recorded key sensitivity was 50.0238%. The initial avalanche result cannot yet be treated as a final measure because the paired tests used different nonces. Overall, PDE-SEC successfully transformed and recovered the tested files with low size overhead and ciphertext statistics close to a uniform distribution; controlled avalanche testing with the same nonce is still required before stronger security conclusions can be drawn.]]>
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