How to securely store database connection details

Question content

In applications that need to open a database connection, username/password details must be sent to the database. What is the safest way to store and use this data?

Correct Answer

The exact method depends on the environment, but generally speaking, you store the credentials in a location readable only by the user running the application. For example, on Windows, you can store the credentials in an ACL-protected location in the registry so that only that user can read it. Alternatively, you can use DPAPI to encrypt your data for further protection. In Unix, you can store it in a chmod protected (and optionally encrypted) file so that only applications can read it.

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