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We are developing a web application intended for use on smartphones and other mobile devices, and we are thinking about running all traffic through HTTPS to make security simpler.
I know that the CPU cost of HTTPS encryption for bigger computers is fairly trivial, but is this also true for modern smartphones like iPhone and Android?
Considering that the cpu of such a device runs at 400 MHz or higher, and that https has been around for decades running on slower cpu’s, I’d say there is no problem with that.