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Re:The password “ji32k7au4a83” has been seen over a hundred ... by thratchnee on Sunday March 03, 2019 @10:04PM (#19298477)
https://en.m.wikipedia.org/wiki/Bopomofo

Wikipedia says it was created under the Beiyang Government so no. Also bopomofo is an alphabet (seperate characters for consonants and vowels) where as katakana/hiragana are syllabaries

However all three systems are derived from regular Chinese script. Hiragana is derived from cursive Chinese script, Katakana from radicals used as shorthand for certain characters, and Bopomofo from archaic forms of modern characters.

Re:The password “ji32k7au4a83” has been seen over a hundred ... by titanix2 on Sunday March 03, 2019 @11:10PM (#19298704)
It's not an alphabet, it's a semi-syllabary (and that's written on the page you linked). There is no separate characters for consonants and vowels but instead a separation between consonants and rhymes. Rhymes can be made of one or multiples vowels, and can be terminated by a consonant (/n/, /ŋ/).