What Is a Handheld Wireless Device?

A handheld device, also called a mobile device (or cell phone device), or a pocket PC, is a pocket-sized computing device that usually has a small display screen, touch input, or Small keyboard. ^[1]

A handheld device, also called a mobile device (or cell phone device), or a pocket PC, is a pocket-sized computing device that usually has a small display screen, touch input, or Small keyboard. This type of device quickly became popular as it could access and obtain a variety of information anytime, anywhere.

Typical handheld devices include

Today's personal digital assistants (PDAs) fall into two main categories: those that use true graphical user interface style appearance and behavior, and those that use a subset of graphical user interfaces. Both types of user interfaces use the handwriting input style, that is, the user implements input through a stylus and a touch screen.

In general, the displays of such devices are smaller. Compared to most graphical user interface-based application windows on desktops and display windows on laptops, the display area of a personal digital assistant is significantly smaller. Graphical user interface-based software is commonly found in laptops or desktops to support personal digital assistants.

Graphical user interface subset

The handheld device user interface provides some of the features of a graphical user interface, namely icons, menus, and pointer behavior. Without any decorative window, only one object can be displayed at a time. The overall user interface style may be referred to as SIMP (screen, icon, menu, pointer). It provides many graphical user interface features.

(1) Many personal digital assistants use icons.

For personal digital assistant users, the main benefit of such an interface is the use of electronic devices to physically replace the combination of pockets (such as paperized calendars, diaries, and address books). After the introduction of the integrated PDA-PC software package (that is, a software package suitable for both personal digital assistants and personal computers), the use of physical electronic devices to perform tasks can greatly improve efficiency.

The use of handwriting or handwriting techniques to enter large amounts of information is clearly undesirable. However, the entry and subsequent maintenance of this information on a personal computer is very efficient. To keep up with your personal computer, you only need to make a few modifications on your personal digital assistant. Information synchronization between personal computers and personal digital assistants improves information synchronization between physical management tools (such as address books) and personal computers and laptops. ^[2]

The operating system of the handheld device and the operating system of the desktop device provide many similar functions, such as scheduling processor resources, managing memory, loading programs, managing input / output, and establishing a user interface. But because handheld devices are often used for simpler tasks, their operating systems are slightly simpler and much smaller.

Handheld device operating systems are typically small and can be stored on read-only memory. Because there is no need to load the operating system from the hard disk into RAM, the operating system of the handheld device can be used almost immediately when the device is turned on. The operating system of the handheld device can provide an embedded touch screen, handwriting input, wireless network connection and cellular communication.

Taking a smart phone as an example, determining whether a mobile phone is a smart phone is not to see whether it supports MP3, HTML page browsing, external memory card and other functions, but to see if it has its own operating system. In other words, it depends on the program extensibility of the operating system and whether it can support the installation and application of third-party software.

The operating systems used by handheld devices are Microsoft Windows Mobile, Apple iOS, Linux (Android, Maemo, WebOS), Symbian, Palm OS, and BlackBerry OS. Most of the mobile phones using Symbian operating system in the market are produced by Nokia and Sony Ericsson; mobile phones using Windows Mobile operating system include HTC (Dopod, Qtek), etc., and mobile phones with CPS function produced by Mio; mobile phones using Palm OS include HandSpring (Merging with Palm) Treo series, and GSL's Xplore series; mobile phones with Linux operating system include Moto's E680, Haier's N60, and Philips' 968. ^[1]

We need a unified end-to-end information security handheld device that can be used as

End user interface in the system. Such devices need to allow standardized and simplified user interfaces, and need to provide portability and personalization features. Such equipment should be a rugged device so that it is suitable for harsh military environments. The device's software stack consists of an operating system and libraries. The device needs to rely on a secure and trusted operating system such as a security-enhanced version of the Linux system. The use of Linux and open resources will provide a level playing field for operator competition. For the portable platform, the popularity of the Linux system can be judged from their choice of the Linux system. The selection information is obtained through Google's Android smartphone toolkit. Open source moko is a new project in which the idea of open source is further extended to the hardware design of PDAs. New Zealand's Fujistu has proposed an Integrated Communications Encryption (ICE) program to demonstrate and prove the above ideas through the program.

ICE is a fully integrated, self-powered, secure mobile platform that allows users to deploy anywhere and support user operations without relying on infrastructure. ICE is designed to enable rapid deployment and use in any environment and under any circumstances, and to perform operations on the first responder in the environment. ICE integrates AES256 encrypted tunnels with New Zealand's defense collaboration network to provide security, and ICE combines power and power generation capabilities into a small, deployable design.

Another project to design mobile device security is the PDA-184 project (CWID, 2009). Using UHFSATCOM radio frequency, PDA-184 successfully realized data transmission between battlefield and base station by using PDA-184's chat and mail functions. The PDA-184 also sends some laser targeting data to remote areas. In addition, it can also interoperate with virtual walkie-talkies and provide chat functions for multiple files.

Tactical Cellular (TACTICELL) is a similar concept. TACTICELL mainly uses netbooks, smartphones, and some applications, such as streaming media and Special Operations Forces (SOF) -related instant messaging. TACTICELL is an IP-based cellular system that provides users with a data transmission and reception rate of 1.8 / 3. 1Mbps. TACTICELL provides the following functions through communication components, such as streaming media video, secure IP voice, chat, mail functions between different network workstations, and device offloading (CWID, 2009b). ^[3]