Which security algorithm spring secures password?

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In last Spring Security form login example, the password is stored in clear-text, it is vulnerable to attack. In practice, recommend to hash your password before storing them. Spring Security supports following hashing algorithms : plaintext.
There are many standard algorithms like SHA or MD5 which combined with a proper SALT can be a good choice for password encoding. Spring Security provides BCryptPasswordEncoder , and implementation of Spring’s PasswordEncoder interface that uses the BCrypt strong hashing function to encode the password.
Note: By default, username for Spring Security based application is “user” and password will be printed in your console log followed by “Using generated security password: <your-password>” text.

Beside above, what is the use of Bcryptpasswordencoder? As per wiki, bcrypt is a password hashing function designed by Niels Provos and David Mazières, based on the Blowfish cipher. Bcrypt uses adaptive hash algorithm to store password.

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