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Update BCryptPasswordEncoder documentation with default strength #8542

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May 21, 2020
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Update BCryptPasswordEncoder documentation with default strength #8542

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2 changes: 2 additions & 0 deletions docs/manual/src/docs/asciidoc/_includes/about/authentication/password-storage.adoc
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Expand Up @@ -324,6 +324,8 @@ https://docs.spring.io/spring-security/site/docs/5.0.x/api/org/springframework/s
The `BCryptPasswordEncoder` implementation uses the widely supported https://en.wikipedia.org/wiki/Bcrypt[bcrypt] algorithm to hash the passwords.
In order to make it more resistent to password cracking, bcrypt is deliberately slow.
Like other adaptive one-way functions, it should be tuned to take about 1 second to verify a password on your system.
The default implementation of `BCryptPasswordEncoder` uses strength 10 as mentioned on the Javadoc of https://docs.spring.io/spring-security/site/docs/current/api/org/springframework/security/crypto/bcrypt/BCryptPasswordEncoder.html[BCryptPasswordEncoder]. Your are encouagred to
tune and test the strength parameter on your own system so that it take roughly 1 second to verify a password.

.BCryptPasswordEncoder
====
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