Re: RFID question
ysng
Your description is very cryptic.
You have to elaborate a bit more of what your envisaged targets are on range, encryption power etc , otherwise we cannot help you.
There are LOTS of different RFID systems around depending on the reading distance you are looking for.
short distance like < 10cm use 13.56 MHz
You also have systems on 135 kHz, 868 MHz, 914 MHz and 2.4 GHz.
They use different reading RF "powers" and can read to upmost about 4...5 meters.
If you need a very long range, you might need a battery powered tag or other and look to 868/900 MHz systems.
rgds