I am working on enhancing security of data on electronic passports using homomorphic cryptography. Obstacles I am facing in application of the solution I have came up with relate directly to available storage space of e-Passport devices.
I would like to ask what are the differences in power consumption between a standard passive RFID tag and an SD card, and whether it would be possible to integrate a high capacity storage within a device communicating over protocols described in ISO/IEC 14443. SD card is just a guess here, as they fit the size requirements and should not be very power hungry. Feel free to propose any other storage solution.
Passive power delivery is a must. I wonder how feasible would be incorporation of higher memory into these devices (at least 2MB). I have no experience in electrical engineering, so apologies if this sounds like a sci-fi scenario ;)