Java / Servlet Interview Questions

Types of authentication methods.

There are 4 main types.

Basic username and password are sent in base64 in HTTP header, sent in cleartext so SSL is needed.
Digest MD5 digest of credentials (hashed passwords ) are sent.
Form-Based username/passwords are sent in POST body; need SSL.
Certifcate-based User sends certificate to the server; very secure and enables Mutual authentication.

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