M1 card, also known as NXPMifareone, is an inductive IC card produced by Philips, commonly used card chip S50 and S70 two models. M1 card is currently the most widely used chip, has been successfully applied in all walks of life in the world. M1 card belongs to the inductive ic card.
Inductive IC card_M1 card introduction_M1 card technical information
I. Introduction of M1 card
The so-called M1 card refers to the use of Philips subsidiary NXP production chip package card abbreviation, the full name NXPMifare a series of commonly used M1S50IC card and M1S70IC currently has a domestic chip such as Fudan. f compatible with it, the use of PVC package M1 chip, induction antenna, and then pressed into shape to make the IC smart card industry said card M1 card (also called S50 card, induction IC card, ME card, M1 card, M1 card, M1 card, M1 card, M1 card, M1 card, M1 card, M1 card, M1 card, M1 card, M1 card. Induction IC card, ME card, etc.), belongs to the non-contact IC card. Contactless IC card, also known as RF card, successfully solves the problem of passive (no power in the card) and contact-free, which is a major breakthrough in the field of electronic equipment. Contactless IC the card, also known as RF card, successfully solved the problem of passive (no power in the card) and contact-free, is a major breakthrough in the field of electronic equipment. It is mainly used in bus, ferry, subway, highway, campus automatic fee collection system, also used in access control management, identity proof and electronic wallet.M advantage is readable and writable multifunctional card, can be divided into multiple storage areas that can be individually encrypted, and can realize multiple applications at the same time. The disadvantages are slightly expensive, short induction distance, suitable for non-fixed consumption system, parking system, access control and attendance system, etc.
Second, M1 card structure
M1 card is divided into 16 sectors, each sector 4 blocks (block 0~3), a total of 64 blocks, according to the block number 0~63. The 0th sector block 0 (i.e. absolute address 0 block) is used to store the manufacturers code, which has been solidified and cannot be changed. Block 0, block 1, block 2 are data blocks for storing data; block 3 is the control block A, access control for storing password, password B. The password and access control of each sector are independent and can be set according to the actual needs of the respective password and access control.
M1 card performance indicators.
lM1S50 card capacity is 8K-bit EEPROM
M1S50 card is divided into 16 sectors, 4 sectors each, 16 bytes each, with block as access unit
lEach sector has an independent set of password and access control
l Each card has a unique serial number, 32 bits
l with anti-collision mechanism, support multi-card operation
No power supply, self-contained antenna, including encryption control logic and communication logic circuit
l data retention period of 10 years, can be rewritten 100,000 times, read unlimited times
lWorking temperature: -20℃~50℃
lWorking frequency: 13.56MHZ
l Communication rate: 106KBPS
l read-write distance: 10mm internal (related to the reader)
Three, M1 card working principle
M1 card reading and writing equipment M card has a set of fixed frequency electromagnetic waves, the card has a LC in the electromagnetic wave excitation, series resonant circuit frequency and electromagnetic wave the same, LC resonant circuit resonance, thus producing resonance M1 card chip capacitor has a charge. At the other end of the capacitor, a single-wire electronic pump is connected to send the charge in the capacitor to another capacitor for storage. When the accumulated charge reaches 2 when V, the capacitor can be used as a power supply to provide working voltage for other circuits, transmitting data in the card or receiving read-write data to achieve two-way communication.
Four, M1 card crack event
In 2008, German researcher Henrik Plotz (HenrykPlotz) University of Virginia computer science doctor Karsten Nohl (KarstenNohl) successfully cracked NXPs Mifare classic chip (non-contact smart card, commonly known as M1 card) security algorithm. M1 card was cracked in the world caused an uproar, which means that the worlds one billion The technology used in secure cards is easy to crack. Since the crack could happen in the lab, there was a lot of concern that the crack would happen outside the lab as well. So far, solving the proximity card has not been difficult. It is not difficult to rely on it alone. 1-card passwords to achieve system security are not very reliable, and many systems are now doing one-card, one-secret in the original card integration to achieve system security.