Build hardened Set-Cookie headers with __Host- prefix, SameSite, and Partitioned (CHIPS).
Execution runs 100% locally inside the browser sandbox using HTML5 Canvas, Web Cryptography Subtle API, and Web Workers. Zero egress.
Zero network latency. Operates completely offline with zero dependencies on third-party backend servers or cloud services.
Built according to official RFC specifications, cryptographic test vectors, and enterprise-grade data transformation standards.
Set cookie name, value, path, domain, and max-age.
Enable HttpOnly, Secure, SameSite, and Partitioned attributes.
Copy the Set-Cookie header or Next.js/Express code snippets.
Cookies Having Independent Partitioned State (CHIPS) allows third-party iframes to store partitioned cookies tied to the top-level site.
The __Host- prefix ensures the cookie is Secure, has Path=/, and cannot be sent from subdomains.
Zero-egress companion tools in the Security & Network suite
Measure cryptographic randomness, Shannon entropy (0-8 bits/byte), Chi-square test, and byte distributions.
Brute-force all 256 single-byte XOR keys with automated English frequency & chi-squared scoring.
Audit CSP, HSTS, X-Frame-Options, and security headers with OWASP grading (A+ to F).
Compare memory hardness, GPU ASIC resistance, and security parameters across KDF standards.
