1. Advanced OS Topics Mobile OS and Distributed Systems Android OS
BitCoin, Hadoop, P2P, Web2.0 & WebOS, and Emerging Internet Apps.

2. The insider’s view of a Centralized OS
(Roughly patterned after XINU [Comer 1984])
user programs
file system 1
device manager and device drivers
real-time clock manager 2
process coordinator
process manager 3
memory manager
hardware 1
remote files 2
+ remote device access 3
+ remote process management

3. Natural Extensions Two Trends Emerging Distributed Apps
System Virtualization
Allow multiple instances of (possibly different) OSes on a single machine
Distributed OS
Large scale networked systems/machines
Emerging Distributed Apps
BitCoin
P2P file sharing, Hadoop
Data outsourcing: Google Docs, Data centers, Yahoo Photo Album, etc.
IPTV/VoIP
Web2.0 & WebOS: Myspace, Wikipedia, etc.

4. Before Virtualization
After Virtualization
Idea:
Decouple [OS, service] pair from hardware
Multiplex lightly-used services on common host hardware
Migrate services from host to host as needed
Introduce new [OS, service] pairs as needed

5. Distributed Systems and Applications

6. Bitcoin – Open source P2P Money

7. Hadoop

8. Google Office
Google Docs & Spreadsheets mimic functions of Microsoft Office tools on the Web
Free storage, linked with Gmail
Work and collaborate as long as you have access to a Web browser
Uniform look and feel on all OS platforms
Ajax and other software techniques make it as responsive as local applications – network latencies are hidden
The future of computing?
Web browser + open source, or Google + Linux?
No need to buy computers and software
Who will pay for Windows and Office in the future?

9. Multicast The key application was streaming audio/video Webinar
Stock Information
On-line TV/Video
Group-based Apps (game, …)

10. Electronic Health Care Systems
Monitoring a person in a pervasive electronic health care system, using (a) a local hub or (b) a continuous wireless connection

11. Peer-to-Peer Systems A killer application: Naptser
Free music over the Internet
Key idea: share the content, storage and bandwidth of individual (home) users
Exemplar P2Ps: Naptser, Gnutella, Freenet, CAN, Chord, BitTorrent
Internet

12. Web 2.0: Wikipedia
Wikipedia is a multilingual, Web-based, free content encyclopedia project. It is written collaboratively by volunteers, allowing most of its articles to be edited by almost anyone with access to the Web site.
The largest collaborative authoring (group editing) project in the world

13. Security SSL Handshake Protocol
Cipher suite: a list of cryptographic
algorithm supported by the client
Phase 1: Establish security capabilities
Phase 2: Sever authentication and key exchange
Phase 3: Client authentication and key exchange
Phase 4: Finish
The client sends a change Cipher Spec
message and copies the pending
CipherSpec into the current CipherSpec.

14. The ANDROID™ OS History
Google acquires mobile software startup Android™ in 2005
Open Handset Alliance officially starts on November 5th, 2007
Android™ 1.0 source and SDK released in Fall 2008 (
Phones & Tablets
Toshiba Android
SmartBook
Sony Ericsson
Cisco Android Tablet
Samsung Galaxy

15. The ANDROID™ OS System Architecture Linux Version 2.6 or 3.0.1
Davlik Virtual Machine (VM)
Application Framework

16. The ANDROID™ OS Applications
Applications are written in Java or Python
Applications are run on the Davlik Virtual Machine
Development done in the Android™ SDK
Development is open to all
User driven Android™ Market

17. ANDROID™ Security Android Security
Relies on security of it’s foundations; Linux, Davlik, and Java.
Security Goal: “A central design point of the Android security architecture is that no application, by default, has permission to perform any operations that would adversely impact other applications, the operating system, or the user.”

18. ANDROID™ Security Enforcement strategy Application Sandboxes
Application signing and certification.
Linux user name base access restriction
Permissions
Application Sandboxes
All Applications run as their own Linux user.
Several Inter-Process Communication methods:
Activities
Services
BroadcastReceiver
ContentProvider
Intent

19. ANDROID™ Security Android™ Permissions
Permissions are static on install
Users have open view of permissions

20. ANDROID™ Security Security Concerns for developers
Protect your application, use least privilege principle.
If you expose, mediate IPCs
Provide maximum availability
Minimize memory footprint
Minimize battery usage
Security Concerns for users
Do your research
Read reviews.
Analyze permissions before installing.
Use Common sense.

21. CprE 450/550: Distributed Systems and Middleware
You are welcome to join me.