STK is the English abbreviation of "SIM Tool Kit", which is "User Identification Application Development Tool". It contains a set of instructions for the interaction between the mobile phone and the SIM card, which allows the SIM card to run small applications in the card to achieve value-added services.
The operating environment of this tutorial: Windows 7 system, Dell G3 computer.
STK is the English abbreviation of SIM Tool Kit. It is "User Identification Application Development Tool". It contains a set of instructions for the interaction between the mobile phone and the SIM card, which allows the SIM card to run small applications in the card to achieve value-added services.
The reason why it is called a small application is because due to the limitation of SIM card space, the applications in the STK card are not large and the functions are simple and easy to use. Currently, the mainstream STK cards available on the market are mainly 16K and 32K; 64K cards are also being actively marketed.
The difference between STK card and ordinary SIM card is that the application program is solidified in STK card. Provide users with a text menu interface through software activation. This text menu interface allows users to retrieve information and even conduct transactions through simple key operations.
For example, if an end user wants to check the weather forecast, in the absence of STK value-added services, the user needs to manually edit the short message "TQ 010" and then send the short message to the 168 service platform. In this way, users need to remember that "TQ" is the weather forecast command code and the 168 service platform number. In fact, there are many command codes, such as "GP" stands for stock inquiry, "HF" stands for telephone bill inquiry, etc. Therefore, it is unrealistic and inconvenient for users to remember all command codes.
STK provides users with menu prompts such as "weather forecast" through the program solidified in the card, so that users only need to enter the long-distance area code of the area they want to query to query weather conditions. This eliminates the need for users to memorize command codes and service platform numbers, achieving user convenience.
STK value-added services are based on GSM short messages. Therefore, as long as the GSM network covers the area, text message services can be provided, with a wide range of services; and text short messages are cheap, only charged when successfully delivered, and do not include roaming fees; for the above reasons, the number of STK card users The business model is now maturing.
The platform of STK cards is not unified, making the STK programs developed by various manufacturers incompatible with each other. In this way, each card merchant's application can only run on its specific platform. This brings great inconvenience to operators. JAVA technology applied to STK card is Java card. Technical issues related to Java cards will not be discussed in this article because there is a lot of information in this area. This article only briefly introduces Watchdata's STK implementation and features.
First of all, Watchdata's STK card fully complies with a series of specifications such as GSM11.11, GSM11.14, GSM03.08, etc., so its usability is no different from other companies' STK cards, and it can fully Meet the various needs of different operators including information inquiry, stock trading, and bank transactions.
Secondly, the implementation method of Watchdata's STK card is similar to the implementation method of JAVA card. It also has an interpreter in the SIM card to interpret and execute the bytecode. The difference from the JAVA card is that the interpreter is independently developed, and the bytecode also uses Watchdata's proprietary format.
The advantage of Watchdata's STK card solution is that the program design is optimized for SIM card applications, so the execution efficiency and space occupation of the interpreter are significantly better than the JAVA card interpreter. For the above reasons, Watchdata's STK card program runs fast and can implement more applications on the same capacity card. Thirdly, Watchdata's STK card can be selectively used in conjunction with PKI, and performs signature verification through the R.S.A algorithm implemented in the card. As a result, using mobile phones to engage in mobile commerce activities is no longer a matter of paper.
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