Bank card has two ways of communication, ISO7816 is A contact protocol (that is, the card has metal contacts), ISO14443 contactless communication, we generally use one of the TYPE A way, this way is the same as the ordinary bus card, and the second generation ID card is the TYPE B way.
The data security of the CPU card does not rely on some physical method (the past M1 card is by a circuit, so it is now broken), but relies on the data management algorithm of the software on the card to ensure that the algorithm is software, in other words, even if it is the same chip vendor to provide the card, if the software vendor's algorithm is not the same, then there is no comparison. I don't believe anyone is capable of breaking all these ever-changing algorithms.
At present, the PBOC3.0 specification is used in China, which is actually the Chinese version of the EMV specification in Europe and the United States, and it is still very rigorous, you can rest assured.