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by jloughry 2627 days ago
Mother's maiden name is documented to have been in use for authentication at least as far back as 1882, and even then it was known to be a weakness [1, §3].

[1] Stephen M. Bellovin. 'Frank Miller: Inventor of the One-Time Pad'. Cryptologia 35(3), pp. 203–222, 2011. DOI: 10.1080/01611194.2011.583711