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Spring Security: Digest Authentication example

In this post, we will discuss about Digest Authentication with Spring Security. You can also read my previous post on Basic Authentication with Spring Security . What is Digest Authentication? This authentication method makes use of a hashing algorithms to encrypt the password (called password hash) entered by the user before sending it to the server. This, obviously, makes it much safer than the basic authentication method, in which the user’s password travels in plain text (or base64 encoded) that can be easily read by whoever intercepts it. There are many such hashing algorithms in java also, which can prove really effective for password security such as MD5, SHA, BCrypt, SCrypt and PBKDF2WithHmacSHA1 algorithms. Please remember that once this password hash is generated and stored in database, you can not convert it back to original password. Each time user login into application, you have to regenerate password hash again, and match with hash stored in database. So, if user