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Why liferay portal limited the allowed special characters in password?  RSS feed

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Hi All,

I am trying to figure out why the liferay portal restricted the number of special characters/symbols to use in password. When I dig into its API, it is restricted to 9 characters which are configured in property file with a key "passwords.passwordpolicytoolkit.charset.symbols" and having values "_ . ! @ $ * = - ?".
There are many other special characters like #, ^. % etc, but they were not included by default.
I knew we can customize and include as many symbols as we want to, but is there any specific reason why liferay restricted these characters?

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