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When I try to implement security measures on mobile device such as encrypting/decrypting of messages, what are downsides of mobile devices those make the implementation of security layer differ than powerful computers?
Do we need really to care about resource consumption in mobile more than PC?
Is the difference significant?
I think that most modern mobile phones (I think that is what you are referring to by mobile device) can handle encryption and decryption of data just fine from a resource perspective. We would probably have to narrow down to a specific platform and discuss the encryption specifics to talk numbers. Some platforms are now providing native file and device encryption features, like Windows Mobile 6 (and up) which may speed up development if you can take advantage of the provided features. What platforms are you looking at?