Simon Lehna Singh, is a British popular science author, theoretical and particle physicist. His written works include Fermat's Last Theorem, The Code Book, Big Bang, Trick or Treatment? Alternative Medicine on Trial and The Simpsons and Their Mathematical Secrets. In 2012 Singh founded the Good Thinking Society, through which he created the website "Parallel" to help students learn mathematics.

Cryptography, or cryptology, is the practice and study of techniques for secure communication in the presence of adversarial behavior. More generally, cryptography is about constructing and analyzing protocols that prevent third parties or the public from reading private messages. Modern cryptography exists at the intersection of the disciplines of mathematics, computer science, information security, electrical engineering, digital signal processing, physics, and others. Core concepts related to information security are also central to cryptography. Practical applications of cryptography include electronic commerce, chip-based payment cards, digital currencies, computer passwords, and military communications.