February 5, 1944
Colossus computer operational at Bletchley Park
The first Colossus computer became operational at Bletchley Park on February 5, 1944 — an electronic code-breaking machine built to decrypt German Lorenz teleprinter traffic.
What it was for
Colossus used thousands of vacuum tubeAn electronic component using evacuated glass tubes — predated transistors in radios, TVs, and early computers.s and programmable logic to analyze ciphertext at speeds impossible for human clerks. Tommy Flowers designed it in secret; ten Colossus machines ran by war's end — a landmark in electronic digital computing kept classified until the 1970s.
Why it's here
Colossus was among the first electronic digital computers used in production.
Why it mattered
It demonstrated large-scale programmable electronics for real-time cryptanalysis.
What it solved
Allied intelligence needed to break high-volume encrypted teleprinter messages faster than manual methods.
Media
ImageColossus at Bletchley ParkPublic domain, via Wikimedia Commons
Related
- ENIAC formally dedicatedFebruary 15, 1946
- Harvard Mark I completedAugust 7, 1944
- Konrad Zuse completes the Z3May 12, 1941