Betty Webb, who as a young woman during World War II helped code breakers decipher enemy signals at Britain’s top-secret Bletchley Park, died on Monday. One of the last surviving members of that group, she was 101.

Her death was confirmed by the Women’s Royal Army Corps Association and by the Bletchley Park Trust.

Ms. Webb, whose given name was Charlotte, was 18 when she joined the Auxiliary Territorial Service, the women’s branch of the British Army, and was assigned to work at its decryption base at Bletchley Park, a 19th-century mansion and estate in Buckinghamshire about 50 miles northwest of London. She helped in the decoding of German messages from 1941 to 1945 and also worked on Japanese signals.

In 2015, Ms. Webb was made a Member of the Order of the British Empire, and in 2021 she was awarded the Légion d’Honneur, France’s most prestigious honor.

She was one of a handful of young women working at Bletchley,ijogo where mathematicians, cryptographers and code breakers endeavored to crack encrypted messages and gather information about the Axis powers.

Now a revival is at hand. Microsoft, which needs tremendous amounts of electricity for its growing fleet of data centers, has agreed to buy as much power as it can from the plant for 20 years. Constellation plans to spend $1.6 billion to refurbish the reactor that recently closed and restart it by 2028, pending regulatory approval.

She had been studying domestic sciences at a local college, but as war swept across Europe, she dropped out. “Several of us decided that we ought to be serving our country rather than just making sausage rolls,” she recalled for an oral history in 2012.

With German submarines on the hunt for Allied vessels in the Atlantic Ocean, the work of the cryptologists at Bletchley Park was critical to the Allied war effort. With the enemy messages decoded, Allied ships could change course and avoid peril.

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