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FLAW IN THE JN25 SERIES OF CIPHERS, THE Cryptologia - Find Articles
by Decius at 12:48 pm EDT, Oct 31, 2007

The principal series of operational ciphers of the Imperial Japanese Navy [IJN] from 1939 to 1945, collectively called JN25, used five-digit code groups which were all multiples of three. This is shown to have been a quite unnecessary major flaw with very considerable consequences.

A detailed discussion of the JN-25 and related ciphers.