How to install a web certificate on an Android device?
For Android 2.2, the certificates (without renaming or converting) can be placed at the root of the sd card.

To install:


Go to the Settings/Security menu, Credential storage section.
Activate Use secure credentials.
Click Install from SD card.
A menu will appear with the available certificates.
Click on each certificate to install.


Those certificates will then be available to the wifi system.