![]() While 125kHz cards are still commonly used, the widely publicized security flaws must be given serious consideration. There are even shop fronts and kiosks that offer card cloning services operating in many cities around the world. Proximity 125kHz copy and emulation circuits have been available to the public for many years, and with instructional videos easy to find and cloning devices readily available on popular shopping websites for less than $30, it’s possible for anyone to copy 125kHz cards today. The ability to copy 125kHz cards - commonly referred to as ‘Prox’ cards - has existed for more than 20 years. The key disadvantage however, is the low level of security. This allows users to present, swipe, or wave their card in the general direction of the reader to get a successful read. In effect, this is very similar to the way the old mag-stripe readers worked.Īpart from being low cost, the only real advantage of 125kHz is that due to the lower power requirements and small amount of data being transmitted, it offers a good read range (of around 10cm or 3.9in) and a short read time. ![]() The data transmitted by the card is not encrypted and is always the same. When a 125kHz card comes within range of a reader, the card immediately begins to transmit its card number. The first of the proximity technologies was 125kHz.
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