Green Card (Shenzhen) Co. Ltd

Model Number: 32K 64k 128k SIM cards Brand Name: GR card Key Specifications/Special Features: 64K GSM SIM cardsCan write IMSI, ICCID, SID, NID, PIN, PUK AMD, AKEY, SMSC technological information into cardStructure and type:SIM card is a smart card with a microprocessor and it consists of the following modules:CPUProgram memory (ROM)Working memory (RAM)Data memory (EPROM or E2PROM)Serial communication moduleThese five modules must be integrated into an integrated circuit (IC), otherwise their safety would be threatenedThis is because the chip connections may become illegal access and misappropriation of SIM cards important cluesIn practice, there are two different forms of SIM cards with the same functions:
Full-size SIM card (commonly known as big card), this form of SIM cards, similar to IC card
The card has since been shrunk to the standard size of 25 x 15mm
Embedded SIM card (commonly known as small card), the size of only 25 x 15mm, is a semi-permanent packed to the cards in the mobile station equipment
Two cards have installed waterproof, wear-resistant, anti-static contact with high-accuracy and reliability characteristics
Cryptographic algorithm and secret key in SIM card:
The most sensitive information of SIM card is the cryptographic algorithm A3, A8, secret Ki, PIN, PUK and Kc
A3, A8 algorithm were written into the SIM card in the producing process, and most people could not read A3, A8algorithm
HN code could be settled by the phone owners
PUK code is held by the operator
Kc was derived in the process of encryption from Ki
PIN and PUK:
PIN personal identification number
2-pins exist (PIN 1 and PIN 2)
Limited attempts on PIN access
PUK-PIN unblocking code
Resetting PUK, resets PIN and the attempt counter
Too many attempts on PUK blocks use permanently
Matching the standards of GSM11.11, GSM11.12, GSM11.14, GSM11.17
Matching the standard of ISO7816
Modularization design that is convenient to realize new functions
Optimized file management system, which supports file access path selection
STK data encrypt and checkout match the GSM03.48 standard absolutely
Supporting the norm of the China mobile OTA2, the little assistant of no agony, mass storage telephone book, group sending short message
Supporting inner backup mechanism to insure the data integrability
Supporting T=0 transmission protocol, communication velocity supports 372/1 and 512/8
Having the function that against inserting and pulling out of card when power on, and abnormal power off
Supporting the algorithm of DES, 3DES, COMP128-1 and have protection against attacking mechanism