As the majority of Rome's enemies were illiterate at this time the cipher remained secure for a time. By the 9th Century AD, after the fall of Rome, records exist of methods to crack it using frequency analysis from Al-Kindi.
During the Second World War, different military services developed their own encryption keys that would often be changed daily. As the allies cracked the codes the Axis forces would be forced to change them - only to have them cracked again.
Era Medieval Legends Crack 19
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