As of a research by using Devanagari Script in captcha, the security of that captcha is increased from 88% to 96%. So why not to use Devanagari Script in password also?
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This does indeed work.
Many systems, especially many web-based platforms (since UTF-8 is the de-facto standard for web development), allow users to use extended scripts in passwords. This allows use of many different languages, and also emoji.
Such passwords are a little harder crack with current tools (due to limitations in the tools) - but not impossibly so.
And as a confirming data point for Devanagari specifically, a few passwords in the 2016 public LinkedIn leak were in Devanagari. And note that LinkedIn didn't have to explicitly support Devanagari in particular - they just had to support UTF-8 and properly hash the results.
Royce Williams
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