Agnes Meyer Driscoll, known as "Miss Aggie" or "Madame X'", was born #OTD in 1889.
She was an American cryptanalyst during both World War I and World War II and was known as "the first lady of naval cryptology." Driscoll played a key role in breaking the Red Book code, a Japanese naval code, in the 1920s. She worked on machine ciphers & contributed to the development of new cryptographic techniques and devices.