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LuisCastellanos-dev/README.md

Luis Fidel Castellanos Diaz

Independent software assurance and security research focused on legacy systems, cryptographic integrity, forensic analysis, and reproducible technical evidence.

Active Projects

Repository Description
cobol-shield Static analysis toolkit for COBOL legacy systems — invisible Unicode detection, format boundary analysis, source transformation integrity
vtr-forensic-img Hybrid Rust+Python forensic image analysis — binary parsing, chain of custody, adversarial test suite
cryptofault Passive PCAP and certificate analysis for OT/ICS — TLS version detection, weak keys, plaintext sessions
cfg-shield Feature flag semantic drift detector for Rust — confirmed against generic-ecies

Upstream Contributions

  • FreeBSD — crp/mbuf/refcount leak fix in sys/net/if_ovpn.c — rGa841961da752 — merged by kp (Kristof Provost)
  • RustCrypto/crypto-bigint — documentation clarification for xgcd_vartime delegation — PR #1333
  • IBM/Bank-of-Z — copy-paste defect in ABND-TIME seconds field across 23 CICS programs — PR #210 open, linked to issue #205
  • generic-ecies — SharedInfo1/2 analysis per SEC 1 v2.0 §5.1.3 — issue #2, PR in preparation
  • Tailscale — FreeBSD pkg version mismatch root cause analysis — tailscale update reads binary version instead of pkg query output, causing repeated daemon restarts on port revisions — issue #18136

Published Research

Methodology

Each project distinguishes observed facts from inference and projection. Security claims require a reproducible artifact — hexdump -C, not visual render.

Pinned Loading

  1. cfg-shield cfg-shield Public

    Feature flag semantic drift detector for Rust crates — detects #[cfg(feature)] gates that change security semantics outside the source file

    Rust

  2. cobol-shield cobol-shield Public

    Security hardening toolkit for COBOL legacy systems — invisible Unicode detection, format boundary analysis, source transformation integrity

    Python

  3. cryptofault cryptofault Public

    Legacy crypto weakness detector for OT/ICS environments

    Rust

  4. vtr-forensic-img vtr-forensic-img Public

    Hybrid Rust+Python forensic image analysis — binary parsing, chain of custody, adversarial test suite

    Python