- SRP - Secure Remote Password Authentication
- SRP is a strong password authentication protocol that can be used to set up a secure communications session when the two sides initially share only a weak, human-memorizable password. Sample software, including secure Telnet and FTP applications, can be downloaded, and you can view my technical paper, which has been published and presented in the 1998 ISOC NDSS Symposium.
- jsbn - BigIntegers and RSA in JavaScript
- A pure JavaScript implementation of large-integer math, capable of performing useful-sized (512-bit, 1024-bit) RSA encryption in almost any Web browser.

- GRU Primality Proofs
- GRUs, or "Generalized Repunits", are numbers of the form
(b
^{n}-1)/(b-1), where b and n are both integers and b>2 and n>2. Several of my proofs are featured in the Prime Pages' Top-20 list of GRU primes. My numbers appear under the prover codes CH2 and p170.As of December 2010 I hold the record for the largest proven GRU prime.

- Prime Number Records
- In 2009, I developed a prime number sieve called SGsieve
and used it to find large prime numbers of selected types,
setting some world records in the process.
These primes appear under the code
L983
on the Prime Pages.
From March 2010 to April 2012 I held the record for the largest known Sophie Germain prime.

- The Coin Page
- Find out how to find doubled-die 1995 Linoln cents and other information for amateur coin collectors.