The reply someone sent to my text message was OTA. What is going on?

Secondly, the SIM browser card has fast and stable OTA functionality. The so-called OTA function means that operators or ICPs can download STK application updates to users in the form of SMS or GPRS. Therefore, users can download their favorite personalized services to the SIM browser card through on-demand mobile phones or the Internet anytime and anywhere. Users can not only use various functions of "Monternet", but also apply for "mobile banking" or "mobile stocks" services without changing SIM cards.

3. Good support for wireless e-commerce

Although the SIM browser card can interpret and run WML web pages like a WAP phone, the SIM browser card uses SMS as the platform. Various services cannot be compared with the powerful browsing functions of WAP mobile phones. But the SIM card is also a security authentication module, so it can complete encryption authentication work in the field of wireless e-commerce. This is a problem that WAP applications cannot solve well in e-commerce. The security authentication of SIM browser card combined with the speed of WAP browsing can make wireless e-commerce perfect.

Facts have shown that the complementarity of the Internet and mobile communication technologies has greatly expanded the service scope of operators and ICPs, thereby enhancing the ability to provide personalized services. SIM Browser is such a new product that combines network technology and is extremely secure.

The SIM browser system mainly consists of three parts:

1. User SIM browser card and mobile phone system

User SIM browser card and mobile phone system are the front end of the entire SIM browser system and are the initiators and recipients of application services. Users submit content through the SIM browser card. The service provider makes a download request, and after the download is completed, the corresponding menu is stored and managed.

2. Network operator system

As the middle layer of the entire system, the network operator system consists of the SMS center system, wireless gateway system and GSM network to provide necessary transmission channels and partial security guarantees for users to complete download services.

3.． Content service provider system

The content service provider system is the backend of the entire system. It is responsible for the upgrade and maintenance of application services, providing users with application service updates, statistics on data packages, and completing billing and other tasks. .

Secure structure and rich applications

Security

End-to-end security mechanism and browser functions are the main features of SIM browser technology.

1. Byte code (Byte code)

Every time the user downloads the application to the SIM card, it is a set of Byte codes processed by WML web pages, and the browser in the SIM card will automatically translate it into the corresponding application menu item. The Byte code here is very similar to the protection processing mechanism of Java technology, which greatly enhances the security of the card itself.

2. Security protection at the transport layer

Because the SIM browser technology follows the GSM 03.48 protocol, the legitimacy of the information can be well guaranteed during the transmission process - the DES-3 encryption algorithm can encrypt the original data, Let the ciphertext be transmitted; the CRC32 redundancy check algorithm can ensure the integrity of the data during the transmission process; the MAC algorithm can authenticate the transmitted data; the counter management function can prevent repeated attacks.

3.． Browser plug-in (Plug-Ins) technology

One of the great benefits of browser technology itself is that plug-ins can be continuously added to the open platform, that is, new special functions can be continuously added. Just as the IE browser can continuously add new Plug-Ins to enrich its functions, the SIM browser can also add a security authentication module with PKI digital signature through Plug-Ins. The security Plug-Ins are used on the SIM card and background application server. After implementation, transaction-type wireless e-commerce applications based on the end-to-end PKI security system of both parties can be realized. PKI Plug-In technology guarantees the security of transactions, making it possible for applications with extremely high security requirements such as mobile shopping, mobile banking, and mobile securities.

Diversified applications

In addition, the introduction of WML (Wireless Markup Language) has greatly reduced the difficulty of developing new applications, because its syntax is very simple and is nested in HTML. General programs Members can learn it in a day or two, and the development cycle has been greatly shortened. The original week's workload may now be completed in a day or two. The open platform and fast development enable more and more third-party application service providers and even individual users to join the ranks of writing new applications, and rich applications are not difficult to realize.

The current SIM browser-based service content mainly includes:

1. Real-time information services: such as news, travel, entertainment, etc.

2. Chat: mobile Paging, information transmission, etc.

3. Mobile commerce: mobile banking services, such as account inquiries, payment and shopping, etc.; mobile stock trading

4. Location-based services