The logical encryption card is a kind of contact mode IC card. They are widely used in medical insurance, data storage, net bar toll, door-control and so on. The chips we adopt include Siemens series and ATMEL series, the capacity range between 2k bit and 16k bit. Siemens series: SLE4442: 256bytes encryption card, can read data, write data, protect data and write password. SLE4428:1024bytes encryption card, can read data, write data, protect data and do password operation. ATMEL series: AT88SC102: 1K bit logical encryption card AT88SC153: 1.5k bit logical encryption card AT88SC1604: 16k bit logical encryption card AT88SC1608: 16k bit or 2k byte logical encryption card