The man who secured the internet and reimagined nuclear peace

History · Published 2 October 2026 Swipe more like this →

In short: In the 1970s, Martin Hellman co-invented the technology that allows trillions of dollars to move securely across the globe every day. But his legacy extends far beyond code, reaching from the front lines of the first crypto wars to a profound theory on how interpersonal peace prevents nuclear war.

Martin Hellman, a Professor Emeritus at Stanford, is a central figure in the history of modern cybersecurity. Alongside Whitfield Diffie and Ralph Merkle, he co-invented public key cryptography, a breakthrough that solved the fundamental problem of key distribution. This technology, often referred to as the Diffie–Hellman key exchange, provides the essential foundation for secure internet transactions and the protection of digital privacy.

His career has been defined by a commitment to transparency and risk analysis. In 1975, Hellman and Diffie emerged as prominent critics of the Data Encryption Standard (DES), arguing its key size was dangerously short. Their warnings proved prescient; by 2012, a $10,000 machine could crack a DES key in mere days. This activism was part of the 'first crypto war' in the late 1970s, which established the right for academic researchers to publish cryptographic findings without government interference.

Beyond the digital realm, Hellman has applied his analytical mind to global stability. During the 1980s, he worked to foster scientific dialogue between the US and Soviet Union, co-editing 'Breakthrough: Emerging New Thinking' in 1987. In 2016, he and his wife, Dorothie, published 'A New Map for Relationships,' which proposes a 'unified field theory' for peace. The work suggests that the mechanisms required to sustain a healthy marriage—addressing internal and interpersonal conflict—are fundamentally connected to the structures needed to prevent nuclear and conventional war.

General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.

Intellect Plus is a visual educational discovery platform for exploring fascinating facts and ideas. Brain Food, Not Brain Rot. What is Intellect Plus?

Related

• How a self-described pure mathematician revolutionized the security of the entire internet
• How two strangers can create a secret key while everyone is watching
• How a student project at Berkeley changed the future of digital security forever
• How a Cold War encryption standard became the world's first public digital lock
• How one man’s software sparked a federal investigation into the nature of code
• The temporary lakeside stadium bridging the gap between football eras
• How a soccer-loving immigrant became the NFL's most feared and celebrated kicking machine
• The journalist who nearly bankrupted his own magazine to expose fraud
• The most famous unknown singer of the 1990s
• The comedian who saved lives by rolling over burning flames
• The enduring presence of a modern footballing icon
• Martyn Waghorn: A journeyman striker who defined his career through high-stakes penalty kicks

More in Born on this day · More in History · Latest · A–Z · All topics