B-Dienst and RN cyphers
What effect would much less success for B-Dienst in breaking the RN cyphers have had? Given the UK was breaking German codes, why did the RN think its was safe?
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On your second point, I haven't read anything that indicates they thought they were safe. When they started having suspicions that they had been broken they changed their codes. Semper FiCatapultam...
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