Public‐key cryptography is a fundamental security tool which helps insure confidentiality and authenticity of electronic communications and data storage. This talk will begin with a brief introduction to public‐key cryptography and discuss the threat to the currently deployed cryptography posed by quantum computers. We will describe some of the proposed “post‐quantum” replacement algorithms designed to be secure against a cryptanalytic attack by quantum computers. We’ll also talk about what it’s like to work at the National Security Agency and leave time for questions.