wireless communication system and network notes

... in Chapter 2, the system is modeled with basic communication subsystems as stated in the project’s scope of work. The first design consists of basic OWC communication system and is shown in ... concepts and theories of intersatellite communication and OWC system was discussed. Previous researches of [2] and [12] were also presented. Several IsOWC applications which are data relaying and ... Presentation and Thesis Writing 3.8 Conclusions 23 25 25 25 26 26 27 27 4 SYSTEM MODELING 4.1 Introduction 4.2 OptiSystem Software 4.3 System Model in OptiSystem 4.4 System Components...

Ngày tải lên: 19/01/2014, 07:20

Ngày tải lên: 24/02/2014, 04:20

... CERT® GUIDE TO SYSTEM AND NETWORK SECURITY PRACTICES 8 THE CERT® GUIDE TO SYSTEM AND NETWORK SECURITY PRACTICES To Identify and Enable Systems and Network Logging Mechanisms Identify and Install ... establishment and maintenance of secure configura- tions and the secure operations of critical assets. Most system and network administrators have developed their knowledge of how to protect and secure systems ... following informa- tion assets: • Detection tools •Networks • Systems (including processes and user behavior) • Network and system performance • Files and directories • Hardware • Access to physical...

Ngày tải lên: 14/03/2014, 22:20

... target system can only be reached throughaparticular router that hasjustgonedown, then Nagios reports that thetargetsystem is “unreachable”, anddoesnot bother to bombarditwithfurther host andservicechecks.The ... andrepresentingthe performance dataprovided by plugins, whichare describedindetail in Chapter 17. Networksare rarely homogeneous, that is,equippedonlywithLinux andother Unix-based operating systems. ... twocen- tral configuration files nagios.cfg and cgi.cfg,while Rapidly Changing States: Flapping and EventHandler aredevoted to some useful butsomewhatexoticfea- tures. Furthernotes on thebook At thetimeofgoing...

Ngày tải lên: 23/03/2014, 07:20

... NỘI VIỆN CÔNG NGHỆ THÔNG TIN VÀ TRUYỀN THÔNG ──────── * ─────── BÀI TẬP LỚN MÔN: ITSS Linux System and Network Management Sinh viên thực hiện: Nguyễn Đức Hiếu (Nhóm trưởng) Phan Quốc Khánh Trần ... Thiết lập domain name: nano /etc/sysconfig /network edit domain name "server1.hhkd1570.vn" - Config custom static ip nano /etc/sysconfig /network- scripts/ifcfg-eth1 DEVICE=eth1 BOOTPROTO=static nm_controlled=no IPADDR=10.0.10.1 NETMASK=255.255.255.0 BROADCAST=10.0.10.255 NETWORK= 10.0.10.0 DEFROUTE=yes - ... giữa 2 máy (accept, drop, reject,…) • Trước hết cần forward traffic từ private network 10.0.10.0/24 trên eth1 sang network trên eth0 - Thêm cấu hình vào file cfg-eth1 để có gateway forward: Nhập...

Ngày tải lên: 08/06/2014, 10:35

... 6.857 Computer and Network Security Class Notes 1 File: http://theory.lcs.mit.edu/˜rivest /notes/ notes.pdf Revision: December 2, 2002 Computer and Network Security MIT 6.857 Class Notes by Ronald ... personal use. MIT 6.857 Computer and Network Security Class Notes 4 File: http://theory.lcs.mit.edu/˜rivest /notes/ divisors.pdf Revision: December 2, 2002 Divisors and Divisibility Definition 1 (Divides ... Computer and Network Security Class Notes 5 File: http://theory.lcs.mit.edu/˜rivest /notes/ flt.pdf Revision: December 2, 2002 Fermat’s Little Theorem Theorem 1 (Fermat’s Little Theorem) If p is prime and...

Ngày tải lên: 28/03/2014, 22:20

... Switzerland e-mail: marc-alexandre.dubois@csem.ch; claude.muller@csem.ch C.C. Enz and A. Kaiser (eds.), MEMS-based Circuits and Systems for Wireless Communication, Integrated Circuits and Systems, ... 333, USA e-mail: piazza@ece.cmu.edu C.C. Enz and A. Kaiser (eds.), MEMS-based Circuits and Systems for Wireless Communication, Integrated Circuits and Systems, DOI 10.1007/978-1-4419-8798-3 2, © ... Microtechnique, Neuch ˆ atel, Switzerland Markus Dielacher Infineon Technologies, Graz, Austria Marc-Alexandre Dubois Swiss Center for Electronics and Microtechnology (CSEM S.A.), Neuch ˆ atel, Switzerland Bertrand Dubus...

Ngày tải lên: 30/03/2014, 07:20

... additional filter (the linear system) , and the PF is the preliminary filter (the linear system) . A detailed discussion of theAFandPFcanbefoundin[2, pages 233–243 and 264– 284] and [5]. Consider briefly ... Parallel and Distributed Computing and Networks (PDCN ’04),pp. 195–200, Innsbruck, Austria, February 2004. [30] J.H.Kim,V.Tuzlukov,W.S.Yoon,andY.D.Kim,“Macrodi- versity in wireless sensor networks ... systems with random signature sequences,” IEEE Transactions on Communications, vol. 37, no. 10, pp. 1052–1061, 1989. [35] J. C. Liberti Jr . and T. S. Rappaport, Smart Antennas for Wireless Communications:...

Ngày tải lên: 21/06/2014, 05:20

Ngày tải lên: 21/06/2014, 20:20

Ngày tải lên: 22/06/2014, 19:20

Ngày tải lên: 22/06/2014, 19:20

Ngày tải lên: 22/06/2014, 22:20

Ngày tải lên: 22/06/2014, 23:20

Ngày tải lên: 23/06/2014, 00:20

Ngày tải lên: 28/06/2014, 10:20

Ngày tải lên: 06/07/2014, 12:20

... Background, and Objectives’’ , Bell System Technical Journal, 58(1); 1–14. [WAL-99] B.H. Walke, Mobile Radio Networks Networking and Protocols, Wiley, Chichester, 1999. Mobile Satellite Communication Networks42 termination ... South Korea and Japan; and as of 1999, there were 43 wireless local loop (WLL) systems in 22 countries using cmdaOne technology. The co-existence of cmdaOne and GSM networks in Australia and China, ... terrestrial IMT-2000 services in the 1885–1980, 2010–2025 and 2110–2170 MHz bands in Regions 1 and 3; and 1885–1980 and 2110–2160 MHz bands in Region 2. This form of service delivery will be discussed...

Ngày tải lên: 14/09/2012, 11:26

... Right Hand Circular Polarisation RHT Registration Handler Terminal RHVN Registration Handler Visited Network RIMS Ranging and Integrity Monitoring Station Mobile Satellite Communication Networks342 BFN ... PSK RACE Research and Development in Advanced Communications in Europe RACH Random Access Channel RAINBOW Radio Access Independent Broadband On Wireless RC Radio Configuration RCS Recursive Systematic ... Orbit NMS Network Management Station NMSS Network Management and Switching Subsystem NMT Nordic Mobile Telephone NRSC National Remote Sensing Centre NSCC Navigation System Control Centre NSP Network...

Ngày tải lên: 14/09/2012, 11:26

... DOES THE WEB APPLICATION  REQUIRE AUTHENTICATION OF THE  USER?  Many Web applications require another server  authenticate users  Examine how information is passed between the  two servers  Encrypted channels  Verify that logon and password information is  stored on secure places  Authentication servers introduce a second target 44 37 34 APPLICATION VULNERABILITIES  COUNTERMEASURES (CONTINUED)  Top­10 Web application vulnerabilities (continued)  Remote administration flaws  Attacker can gain access to the Web server through the  remote administration interface  Web and application server misconfiguration  Any Web server software out of the box is usually vulnerable  to attack  Default accounts and passwords  Overly informative error messages 32 16 WEB FORMS  Use the <form> element or tag in an HTML document  Allows customer to submit information to the Web server  Web servers process information from a Web form by  using a Web application  Easy way for attackers to intercept data that users  submit to a Web server 7 APPLICATION VULNERABILITIES  COUNTERMEASURES  Open Web Application Security Project (OWASP)  Open, not­for­profit organization dedicated to finding  and fighting vulnerabilities in Web applications  Publishes the Ten Most Critical Web Application  Security Vulnerabilities  Top­10 Web application vulnerabilities  Unvalidated parameters  HTTP requests are not validated by the Web server  Broken access control  Developers implement access controls but fail to test them  properly 29 USING SCRIPTING LANGUAGES  Dynamic Web pages can be developed using scripting  languages  VBScript  JavaScript  PHP 18 OPEN DATABASE CONNECTIVITY  (ODBC) (CONTINUED)  ODBC defines  Standardized representation of data types  A library of ODBC functions  Standard methods of connecting to and logging on to a  DBMS 24 WEB APPLICATION COMPONENTS  Static Web pages  Created using HTML  Dynamic Web pages  Need special components  <form> tags  Common Gateway Interface (CGI)  Active Server Pages (ASP)  PHP  ColdFusion  Scripting languages  Database connectors 6 APACHE WEB SERVER  Tomcat Apache is another Web Server program  Tomcat Apache hosts anywhere from 50% to 60% of all  Web sites  Advantages  Works on just about any *NIX and Windows platform  It is free  Requires Java 2 Standard Runtime Environment (J2SE,  version 5.0) 15 ON WHAT PLATFORM WAS THE WEB  APPLICATION DEVELOPED?  Several different platforms and technologies can  be used to develop Web applications  Attacks differ depending on the platform and technology used to develop the application  Footprinting is used to find out as much information  as possible about a target system  The more you know about a system the easier it is to  gather information about its vulnerabilities 45 OPEN DATABASE CONNECTIVITY  (ODBC)  Standard database access method developed by  the SQL Access Group  ODBC interface allows an application to access  Data stored in a database management system  Any system that understands and can issue ODBC  commands  Interoperability among back­end DBMS is a key  feature of the ODBC interface 23 48 UNDERSTANDING WEB APPLICATIONS  It is nearly impossible to write a program without bugs  Some bugs create security vulnerabilities  Web applications also have bugs  Web applications have a larger user base than standalone  applications  Bugs are a bigger problem for Web applications 5 DOES THE WEB APPLICATION  CONNECT TO A BACKEND DATABASE  SERVER? (CONTINUED)  Basic testing should look for  Whether you can enter text with punctuation marks  Whether you can enter a single quotation mark followed by  any SQL keywords  Whether you can get any sort of database error when  attempting to inject SQL 43 DOES THE WEB APPLICATION USE  DYNAMIC WEB PAGES?  Static Web pages do not create a security  environment  IIS attack example  Submitting a specially formatted URL to the  attacked Web server  IIS does not correctly parse the URL  information  Attackers could launch a Unicode exploit http://www.nopatchiss.com/scripts/ ... DOES THE WEB APPLICATION  REQUIRE AUTHENTICATION OF THE  USER?  Many Web applications require another server  authenticate users  Examine how information is passed between the  two servers  Encrypted channels  Verify that logon and password information is  stored on secure places  Authentication servers introduce a second target 44 37 34 APPLICATION VULNERABILITIES  COUNTERMEASURES (CONTINUED)  Top­10 Web application vulnerabilities (continued)  Remote administration flaws  Attacker can gain access to the Web server through the  remote administration interface  Web and application server misconfiguration  Any Web server software out of the box is usually vulnerable  to attack  Default accounts and passwords  Overly informative error messages 32 16 WEB FORMS  Use the <form> element or tag in an HTML document  Allows customer to submit information to the Web server  Web servers process information from a Web form by  using a Web application  Easy way for attackers to intercept data that users  submit to a Web server 7 APPLICATION VULNERABILITIES  COUNTERMEASURES  Open Web Application Security Project (OWASP)  Open, not­for­profit organization dedicated to finding  and fighting vulnerabilities in Web applications  Publishes the Ten Most Critical Web Application  Security Vulnerabilities  Top­10 Web application vulnerabilities  Unvalidated parameters  HTTP requests are not validated by the Web server  Broken access control  Developers implement access controls but fail to test them  properly 29 USING SCRIPTING LANGUAGES  Dynamic Web pages can be developed using scripting  languages  VBScript  JavaScript  PHP 18 OPEN DATABASE CONNECTIVITY  (ODBC) (CONTINUED)  ODBC defines  Standardized representation of data types  A library of ODBC functions  Standard methods of connecting to and logging on to a  DBMS 24 WEB APPLICATION COMPONENTS  Static Web pages  Created using HTML  Dynamic Web pages  Need special components  <form> tags  Common Gateway Interface (CGI)  Active Server Pages (ASP)  PHP  ColdFusion  Scripting languages  Database connectors 6 APACHE WEB SERVER  Tomcat Apache is another Web Server program  Tomcat Apache hosts anywhere from 50% to 60% of all  Web sites  Advantages  Works on just about any *NIX and Windows platform  It is free  Requires Java 2 Standard Runtime Environment (J2SE,  version 5.0) 15 ON WHAT PLATFORM WAS THE WEB  APPLICATION DEVELOPED?  Several different platforms and technologies can  be used to develop Web applications  Attacks differ depending on the platform and technology used to develop the application  Footprinting is used to find out as much information  as possible about a target system  The more you know about a system the easier it is to  gather information about its vulnerabilities 45 OPEN DATABASE CONNECTIVITY  (ODBC)  Standard database access method developed by  the SQL Access Group  ODBC interface allows an application to access  Data stored in a database management system  Any system that understands and can issue ODBC  commands  Interoperability among back­end DBMS is a key  feature of the ODBC interface 23 48 UNDERSTANDING WEB APPLICATIONS  It is nearly impossible to write a program without bugs  Some bugs create security vulnerabilities  Web applications also have bugs  Web applications have a larger user base than standalone  applications  Bugs are a bigger problem for Web applications 5 DOES THE WEB APPLICATION  CONNECT TO A BACKEND DATABASE  SERVER? (CONTINUED)  Basic testing should look for  Whether you can enter text with punctuation marks  Whether you can enter a single quotation mark followed by  any SQL keywords  Whether you can get any sort of database error when  attempting to inject SQL 43 DOES THE WEB APPLICATION USE  DYNAMIC WEB PAGES?  Static Web pages do not create a security  environment  IIS attack example  Submitting a specially formatted URL to the  attacked Web server  IIS does not correctly parse the URL  information  Attackers could launch a Unicode exploit http://www.nopatchiss.com/scripts/ ... DOES THE WEB APPLICATION  REQUIRE AUTHENTICATION OF THE  USER?  Many Web applications require another server  authenticate users  Examine how information is passed between the  two servers  Encrypted channels  Verify that logon and password information is  stored on secure places  Authentication servers introduce a second target 44 37 34 APPLICATION VULNERABILITIES  COUNTERMEASURES (CONTINUED)  Top­10 Web application vulnerabilities (continued)  Remote administration flaws  Attacker can gain access to the Web server through the  remote administration interface  Web and application server misconfiguration  Any Web server software out of the box is usually vulnerable  to attack  Default accounts and passwords  Overly informative error messages 32 16 WEB FORMS  Use the <form> element or tag in an HTML document  Allows customer to submit information to the Web server  Web servers process information from a Web form by  using a Web application  Easy way for attackers to intercept data that users  submit to a Web server 7 APPLICATION VULNERABILITIES  COUNTERMEASURES  Open Web Application Security Project (OWASP)  Open, not­for­profit organization dedicated to finding  and fighting vulnerabilities in Web applications  Publishes the Ten Most Critical Web Application  Security Vulnerabilities  Top­10 Web application vulnerabilities  Unvalidated parameters  HTTP requests are not validated by the Web server  Broken access control  Developers implement access controls but fail to test them  properly 29 USING SCRIPTING LANGUAGES  Dynamic Web pages can be developed using scripting  languages  VBScript  JavaScript  PHP 18 OPEN DATABASE CONNECTIVITY  (ODBC) (CONTINUED)  ODBC defines  Standardized representation of data types  A library of ODBC functions  Standard methods of connecting to and logging on to a  DBMS 24 WEB APPLICATION COMPONENTS  Static Web pages  Created using HTML  Dynamic Web pages  Need special components  <form> tags  Common Gateway Interface (CGI)  Active Server Pages (ASP)  PHP  ColdFusion  Scripting languages  Database connectors 6 APACHE WEB SERVER  Tomcat Apache is another Web Server program  Tomcat Apache hosts anywhere from 50% to 60% of all  Web sites  Advantages  Works on just about any *NIX and Windows platform  It is free  Requires Java 2 Standard Runtime Environment (J2SE,  version 5.0) 15 ON WHAT PLATFORM WAS THE WEB  APPLICATION DEVELOPED?  Several different platforms and technologies can  be used to develop Web applications  Attacks differ depending on the platform and technology used to develop the application  Footprinting is used to find out as much information  as possible about a target system  The more you know about a system the easier it is to  gather information about its vulnerabilities 45 OPEN DATABASE CONNECTIVITY  (ODBC)  Standard database access method developed by  the SQL Access Group  ODBC interface allows an application to access  Data stored in a database management system  Any system that understands and can issue ODBC  commands  Interoperability among back­end DBMS is a key  feature of the ODBC interface 23 48 UNDERSTANDING WEB APPLICATIONS  It is nearly impossible to write a program without bugs  Some bugs create security vulnerabilities  Web applications also have bugs  Web applications have a larger user base than standalone  applications  Bugs are a bigger problem for Web applications 5 DOES THE WEB APPLICATION  CONNECT TO A BACKEND DATABASE  SERVER? (CONTINUED)  Basic testing should look for  Whether you can enter text with punctuation marks  Whether you can enter a single quotation mark followed by  any SQL keywords  Whether you can get any sort of database error when  attempting to inject SQL 43 DOES THE WEB APPLICATION USE  DYNAMIC WEB PAGES?  Static Web pages do not create a security  environment  IIS attack example  Submitting a specially formatted URL to the  attacked Web server  IIS does not correctly parse the URL  information  Attackers could launch a Unicode exploit http://www.nopatchiss.com/scripts/...

Ngày tải lên: 17/09/2012, 10:44

... II trong sách “Principles of Digital Communication Systems and Computer Networks” của nhóm em. Phần I – Các hệ thống truyền thông số (Digital Communation System) Chương 2: Lý Thuyết Thông Tin (Information ... sư truyền thông. Tài liệu tham khảo C. E. Shannon. "A Mathematical Theory of Communication. " Bell System Technical Journal, Vol. 27, 1948. Tất cả các kỹ sư truyền thông phải đọc bài ... Cuốn sách của ông “A Maththemathical Theroy of Communication ” (Một lý thuyết toán học của sự truyền thông tin) được xuất bản trong Tạp chí Bell System Technical là cơ sở cho sự phát triển toàn...

Ngày tải lên: 18/09/2012, 10:13