Will this require a peripheral to extract data from the SD card? I can imagine something working such that you can write to it, but the data is encrypted in str

Will this require a peripheral to extract data from the SD card? I can imagine something working such that you can write to it, but the data is encrypted in stream, and then to read off, you have to have an encryption key. Also, how are you going to fit the needed processing power for encryption on the SD card?