Fun fact: The Japanese had a technologically superior encryption machine to Enigma which the Allies dubbed "Purple". Unfortunately, the operators made several blunders which defeated the encryption, among them habitually beginning each message with "I have the honor to inform Your Excellency".
Japan today still hasn't fully grokked how encryption works, as evidenced by the widespread corporate practice of "PPAP", which means sending sensitive info as a password-protected zip file via email, then sending the plaintext password in a separate email to the same recipient address.
https://ovid.cs.depaul.edu/Classes/CS233-W04/Papers/PurpleMa...
Japan today still hasn't fully grokked how encryption works, as evidenced by the widespread corporate practice of "PPAP", which means sending sensitive info as a password-protected zip file via email, then sending the plaintext password in a separate email to the same recipient address.
https://ja.wikipedia.org/wiki/PPAP_(%E3%82%BB%E3%82%AD%E3%83...