CagsTech

cat ~/proof-of-work

Selected work in networking, cryptography, embedded systems, and secure infrastructure — with emphasis on constrained environments, real-world reliability, and documented design decisions.

Featured lwIP-CE preview

lwIP-CE

Lightweight TCP/IP, TLS 1.3, and Ethernet support for the TI-84+ CE.

  • lwIP-CE provides a full internet connection over USB to a device that doesn't natively provide it with no hardware modification.
  • Includes a compact TLS 1.3 stack, using the same modern encryption that drives the padlock icon in the browser. The stack includes a statistically validated RNG built from electrical noise in calculator memory, plus core cryptographic primitives such as AES-128-GCM, SHA-256, HKDF/HMAC, X25519 ECDHE, and RSA-2048 signature verification for certificate validation.
  • Tested like professional security software. Every non-upstream addition has test coverage, every cryptographic primitive is validated against NIST-published CAVP test vectors, a timing analysis suite, and static analysis scans every line of code added to the project.
wip
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other work

CryptX preview

CryptX

released
released

A full-function cryptographic library for the TI-84+ CE allowing developers to implement NIST standards for encryption into their programs.

  • Implements well-established, publicly specified cryptographic standards — AES, RSA, SHA-256, HMAC, PBKDF2, and elliptic curve primitives. No self-rolled crypto; everything traces back to NIST and RFC specifications.
  • Brought modern cryptography to a platform that had none. Before CryptX, the TI-84+ CE had no serious cryptographic library. Developers who needed encryption had no viable option. CryptX changed that.
  • The starting point of a longer journey. CryptX predates the formal testing and validation pipeline that lwIP-CE introduced. It was where the hard lessons about cryptographic rigor were learned — lessons that directly shaped the stricter engineering standards applied to lwIP-CE's TLS implementation.
CagsCalcLabs preview

CagsCalcLabs

websiteself-hostedphp

A self-hosted site dedicated to networking, security, and development tools for the TI-84+ CE calculator. Designed, built, and maintained independently, CagsCalcLabs serves as a platform for open-source releases, documentation, and service offerings related to the platform.

  • Role: Owner, Developer
  • Stack: HTML, CSS, JS, PHP (custom), no framework dependencies
  • Hosting: Self-hosted on business-residential infrastructure with hardened server config
Blast File Integrity Software preview

Blast File Integrity Software

released
released

Utility that validates hashes of programs, appvars and the operating system of the TI-84+ CE. Also checks the aforementioned for malware based on community-sourced malware definitions.

  • Uses SHA-256 hashing and maintains an AIDE-style database of known good hashes for programs and appvars.
  • Accepts a community-sourced curated virus definitions file and scans executables for signatures from the definitions file.
  • Prone to false positives due to inability to distinguish executable sections from benign data.
This is Our Story preview

This is Our Story

websiteclientwordpress

Assisted with light PHP scripting, plugin configuration, and routine WordPress core + theme updates for an existing site maintained by the client.

  • Role: Support / Maintenance

technical writing

CryptX Technical Whitepaper preview

CryptX Technical Whitepaper

publicationti-84+ cesecurity

A technical document offering comprehensive API documentation tailored for developers of all experience levels, alongside an in-depth analysis of the CryptX library for peer review.

lwIP-CE Technical Whitepaper preview

lwIP-CE Technical Whitepaper

publicationti-84+ cesecurity

A technical document offering an overview of the lwIP port — threat modeling, risk assessment, entropy justification, and datasets — tailored for developers of all experience levels and intended for peer review.

ls -l ~/certifications

cat ~/job-inquiry.txt

See something you like and want to discuss a job? My resume is here. Fair warning: if you ask for a cover letter, you're getting the output of ollama run qwen:2b "write me a cover letter". I don't make the rules.