This is the text and video of Arthur W. Coviello's keynote speech at the RSA Conference delivered on February 25, 2014, in San Francisco, California.

This is the text, audio, and video [40:52] of Secretary of Defense Ashton Carter's Drell Lecture on innovation and cybersecurity delivered on April 23, 2015, at Stanford University, in Palo Alto, California.

This organization seeks to understand society's ethical and legal issues from an international perspective in light of new technology. The website contains news and policy statements.

Test to see if you successfully decrypted clues.

A quick comprehension check over congruence relation.

A quick check to practice decrypting messages.

Practice problems over modular multiplication in cryptography.

Practice problems for reviewing modular addition in cryptography.

Practice using the modulo operator.

Find out the basics of modular arithmetic.

If you've seen the lesson on the one-time pad, you know that it is the ultimate shift cipher. It involves the application of a random list of shifts equal to the length of the message. It's important to understand exactly how and why the...

Based off of the hit television show NUMB3RS, this lesson introduced students to simple coding techniques (namely, the shift cipher). Students learn to translate codes from nonsense to English by quantifying each letter, and then...

This lesson provides real life applications for divisibility and prime numbers including the Cicada Cycle's use of prime numbers and Cryptography,encryption.

As the Internet continues to grow, the issues that confront its stable, beneficial evolution increase in number and complexity. Here, the Internet Society presents links to information on a variety of Internet issues including copyright,...