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On 20 September 1940, Genevieve Grotjan, a 27-year-old statistician, discovered a pattern in several Japanese ciphered messages. The discovery provided an entry point that led to one of the greatest achievements in cryptanalysis: the breaking of Japan’s highest-level diplomatic cipher system, often referred to as PURPLE.
| Date Taken: | 09.20.2023 |
| Date Posted: | 09.22.2023 10:49 |
| Photo ID: | 8036321 |
| VIRIN: | 230920-O-MF537-6723 |
| Resolution: | 750x960 |
| Size: | 177.49 KB |
| Location: | US |
| Web Views: | 13 |
| Downloads: | 1 |
This work, SIS Makes Breakthrough Against Japanese Code (20 SEP 1940), by Erin Thompson, identified by DVIDS, must comply with the restrictions shown on https://www.dvidshub.net/about/copyright.
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