1. Mobile Mobile OS and Application Team: Kwok Tak Chi Law Tsz Hin So Ting Wai

2. Windows Mobile  Based on Win32 API (Microsoft)  similarly in the window desktop edition  Run on portable devices  Pocket PCs  Smart phones  Portable Media Centers  On-board computers for automobiles

3. Windows Mobile (Authentication and Encryption)  Data Encryption Standard (DES)  Data encryption using a private (secret) key that offers 56-bit encryption for each 64-bit block of data  Advanced Encryption Standard (AES)  The current algorithm recommended by the US National Institute of Standards and Technology (NIST) for use in U.S. Government  Windows Mobile 5.0 supports both 128-bit and 256-bit AES encryption.

4. Windows Mobile (Authentication and Encryption)  RSA  An Internet encryption and authentication system  Provides encryption algorithms developed for Web browsers  Owned by RSA Security

5. Windows Mobile (Authentication and Encryption)  Strong password technology for Windows Mobile- powered Pocket PCs, SIM lock support  802.1x Extensible Authentication Protocol / Transport Layer Security for wireless connections  Wireless Security can support WEP Wireless Encryption and Wi-Fi Protected Access (WPA)  Secure Sockets Layer (SSL) connections  Microsoft Pocket Internet Explorer

6. Windows Mobile Strength  Interaction with Microsoft's products  Smooth  User friendly

7. Windows Mobile Weaknesses  No Multi-tasking  Less Apps  New product

8. Android  Developed by Google  Based on Linux kernel  Open source  The network and telephony configuration

9. Android  Allow the developer to write the managed code in Java language  Controlling the device via Java library  Highly secure operation system with heavy encryption

10. Android (Encryption and Authentication)  RFC 4615: The Advanced Encryption Standard- Cipher-based Message Authentication Code-Pseudo-Random Function-128 (AES-CMAC-PRF-128) Algorithm for the Internet Key Exchange Protocol (IKE)

11. Android Strengths  Easy to accessible  Open resources  Million apps provided  Customization  Smooth  User friendly

12. Android Weaknesses  Virus at android market  Many different version, not Unity

13. iPhone OS  Developed by Apple Inc.  Four abstraction layers  Core OS layer  Core Services layer  Media layer  Cocoa Touch layer  Provide software development kit (SDK)  Based on a variant of the same XNU kernel  iPhone is also based on XcodeXcode

14. iPhone OS (Encryption)  iPhone 3GS offers hardware-based encryption. iPhone 3GS hardware encryption uses AES 256 bit encoding to protect all data on the device. Encryption is always enabled, and cannot be disabled by users.

15. iPhone OS (Authentication)  In addition to enabling secure access to existing VPN environments, iPhone offers proven methods for user authentication.  Authentication via standard x.509 digital certificates provides users with streamlined access to company resources and a viable alternative to using hardware-based tokens.

16. iPhone OS (Authentication)  WPA/WPA2  iPhone supports WPA2 Enterprise to provide authenticated access to your enterprise wireless network. WPA2 Enterprise uses 128-bit AES encryption, giving users the highest level of assurance that their data will remain protected when they send and receive communications over a Wi-Fi network connection. And with support for 802.1x, iPhone can be integrated into a broad range of RADIUS authentication environments.

17. iPhone OS Strengths  Smooth  Million apps provided  Easy to use  User friendly

18. iPhone OS Weaknesses  Accessible  Development

19. Symbian OS  Developed by Symbian Ltd  Contains the related libraries, user interface and reference implementation of the common tools  Open source operating system

20. Symbian OS  licenses Symbian OS to the world’s leading handset manufacturers  A descendant of Psion's EPOC and runs exclusively on ARM (Advanced RISC Machine) processors

21. Symbian OS Strengths  More Apps  Widely used at various devices

22. Symbian OS Weaknesses  Out dated product  Virus  Not smooth