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What did Colossus do with the key data needed to analyze Tunny messages?
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Colossus
Funding for this code-breaking machine came from the Ultra project.
Unlike its predecessor, the Heath Robinson machine, which required a second punched paper tape to input key data, the Colossus computer generated the crucial key data electronically using its own internal circuits. By eliminating the need for a second input tape, Colossus avoided the significant mechanical difficulties associated with synchronizing two tapes at high speeds.1