> I want to prevent jail-breaking on the mobile device.

Can't be done. The modding community are cracking device bootloaders
for breakfast.

> I want to store
> the username/password on the mobile device.

Bad idea. You can store username safely, and use it as salt for a
hashing function on a prompted password though.

> I looked at Digest authentication but I am already using https.

If you're already using SSL, just use Basic auth instead of Digest.
It's trivial to add a servlet filter in front of Jersey to handle
this.

> Can you please suggest some ways to do this ?

Android doesn't have a keyring AFAIK, though rumors says Android 3.0
will gain corporate-level security/encryption support. The good news
is that unlike the Oracle JRE, Android provides unlimited encryption
strength through Bouncy Castle so if you are willing to require a
password, your on-device data can be made very safe (i.e. use a
AES-256 cipher and a SHA512 hash).

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