Advanced Encryption Standard (AES) (noun) [Word Notes]
April 7, 2026·9 min
The episode opens with a sponsor message from Arcova, a cybersecurity and AI consulting firm. Host Rick Howard introduces the term AES — Advanced Encryption Standard — spelling it out and providing a formal definition as a U.S. government specification for data encryption. He notes AES was developed by NIST in 2001 and adopted as a federal standard in 2002. Howard admits he finds encryption terminology difficult to keep straight and uses a Spider-Man: Into the Spider-Verse reference to frame a fresh walkthrough of foundational concepts. He defines encryption, cryptographic signing, keys, cryptanalysis, and cryptology in plain language. The historical survey begins with Spartan soldiers around 600 BC using a scytale device to encode military messages. By 60 BC, Romans were using substitution ciphers, shifting letters by an agreed number — a method Julius Caesar employed. In 1553, Italian cryptographer Giovanni Battista Bellasso introduced the concept of a shared secret key, which both sender and receiver needed to encrypt and decrypt messages. Edward Hebern built an electromechanical rotor machine embedding the key in a rotating disc in 1917. The following year, German engineer Arthur Scherbius invented the Enigma machine using multiple rotors, which the German military used in both World Wars. IBM invented the block cipher in the 1970s, and the U.S. government adopted IBM's Data Encryption Standard in 1973, using it until it was broken in 1990. In 1976, Whitfield Diffie and Martin Hellman created the Diffie-Hellman Key Exchange, enabling encrypted communication without a pre-shared secret key — the foundation of asymmetric encryption and all modern web transactions. In 1977, Ron Rivest, Adi Shamir, and Leonard Alderman built the first working implementation of that concept, naming the algorithm RSA after themselves. By 2000, AES replaced DES as the government standard, offering faster performance and support for much longer keys. Howard closes with a reference to the computer game Cypher, which uses Claude Debussy's Clair de Lune as background music and tasks players with solving cryptanalysis puzzles across multiple historical cipher types. Production credits are given to writer Tim Nodar, executive producer Peter Kilpie, editors John Petrick and Rick Howard, and sound designer Elliot Peltzman. A closing sponsor message promotes GuardSquare's mobile application security platform.
