cr.yp.to

cr.yp.to is the long-running personal website of D. J. Bernstein, a cryptographer and software author known for both research and widely deployed networking tools. The homepage works as a directory, linking to subdomains and pages that host his papers, talks, and project documentation. There is no marketing layer; the site assumes visitors arrive with a project name or topic already in hand.

The linked material spans several distinct areas. Cryptographic research includes SafeCurves, Elligator, and the Explicit-Formulas Database, alongside post-quantum efforts such as Classic McEliece, NTRU Prime, and SPHINCS+. Software projects include NaCl, djbsort, and the qmail, djbdns, daemontools, and ucspi-tcp home pages. Benchmarking resources such as ECRYPT and libpqcrypto.org are also reachable, as are pages documenting the Bernstein v. United States case.

The site is most useful to cryptography researchers, security engineers, and developers who need primary references rather than summaries. Students working through elliptic-curve or post-quantum topics will find formulas and implementation notes, while system administrators may come for the qmail and djbdns documentation. Casual readers looking for an introduction to the field will find little guidance here.

A practical approach is to use the homepage as an index and go directly to the subdomain for your topic, since each project page carries its own structure and conventions. Many links offer a viacache mirror, which helps whe