iPhone: Where to store username and password credentials?

Question

What is the best/most secure way for my iPhone app to remember Username and Password credentials, so that the user will not have to reenter them every time they use my app? (My app will be logging in to a server using these credentials and returning some data).

Thanks!

Answer 1

The best place would be the keychain. It is automatically encrypted and backed up. However, on older iOS versions, the backup would not be accessible after a restore. See the Keychain Services Programming Guide and Keychain Services Reference.