My CS Home Page.

The Joy of Factoring,
a factoring book.
The book cover.
Some corrections and comments.

Cryptanalysis of Number Theoretic Ciphers

Sums of Squares of Integers

The Cunningham Project

Publications

CERIAS Security Seminar

Bridge to Research slides from
a lecture on February 24, 2020.

Mersenne Primes slides from
a lecture on November 18, 2008.

The Invention of Public Key Cryptography slides from
a lecture on October 21, 2008.

The Number Theory Foundation

The Fermat Prime Divisors
(A new link)

The Saturday Hike

Photo of Wagstaff at the Ramanujan Centre in Kumbakonam, India.
Photo of Wagstaff and the factorization of (3^{349} - 1)/2

Photo by Dave Umberger.

News story about factoring (3^{349} - 1)/2

Some elementary remarks about why factoring Cunningham numbers
is important and interesting.
Also shown there is the graph of the distribution function of the
fractional parts of the Bernoulli numbers from the Erdos-Wagstaff paper.

MR submission page

The graph of the distribution function of the
fractional parts of the Bernoulli numbers from the Erdos-Wagstaff paper.

Send e-mail to Sam Wagstaff

#### (This page last modified August 23, 2023)