Codebreaking reveals what a message says. Traffic analysis examines the context in which messages are sent, including patterns that can guide the movement of friendly forces. Either source can provide useful information while leaving part of the situation unexplained. Combining the two lets an intelligence staff interpret a message alongside the activity around it. The Bombe's contribution belongs to the content side of that combined picture.
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Combining decrypted content with traffic context
Decryption and traffic analysis answer different questions, and commanders benefit from putting their results together.