Are apps from the opera store safe?

The Nokia Store app on my Asha 311 is now redirecting to the Opera Store. When I tried to download and run an app, the phone gave me a security / unsigned warning. How can I tell if an app is safe?

That error means, JAD/JAR were no signed by a code-signing certificate (or more precise, the JAD does not contain the line MIDlet-Jar-RSA-SHA1, which is a hash of the next to recive JAR). Code-signing makes sure the author of the app is known by person/address and the JAR was not changed between you and the author. That’s it. If the code-signature is missing, you cannot say, the app is not safe.
If you double-check the author yourself – here PicoWireless – and if you trust the Opera Mobile Store, you are done. By the way, in the case of PicoMail, trust is a complicated matter because PicoMail uses its own proxy server to compress/enrich your E-mail messages. This allows you to receive very big E-mail message, even though the heap memory of your phone is limited. However, because of this proxy, PicoWireless obtains your username/password for your E-mail account in clear text.

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