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: :: "" :: :: :: :: :: :: " 2012" 70 :: :: ::
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1 6 6

:

  1. #1


     

     

    ,,,



    ߿ ߿ . . .

    . WiFi 802.11b . . ! ߡ . .

    . WiFi ɡ . 300 . ! 50 30 .

    ɡ . ɿ

    ʡ cable DSL . Dial Up connections

    ǡ wireless adapter cards .

    . ɿ

    ʡ . wireless-access point. DSL Cable .

    ǡ . router .

    ǡ .


    , . . , .
    , () () Access Point. 3 , hub switch .
    :
    , Wireless D-Link USB Adapter DWL 120




    , Wireless D-Link PCMCIA Adapter DWL 650





    , Wireless D-Link DWL 900AP+ Access Point




    : IEEE 802.11b Standard
    , , ǿ
    :Wireless D-Link USB Adapter DWL 120, !
    USB . , PCI , , USB. 11 () ( 10 ).
    . ( ) , , No, i will restart the computer later , shutdown . USB , , .
    USB

    :Wireless D-Link PCMCIA Adapter DWL-650+ , , PCMCIA. , , .
    ! 22 .
    : USB
    : Wireless D-Link DWL 900AP+ Access Point
    HUB Switch , , . , , hub 8 16 , .
    :



    , 100 , .
    ( ) Infrastructure Mode. ( ) , Ad Hoc


    :
    ( ) IP Address , DHCP Server .
    IP Address :
    start settings control panel Network and dial up connections, Local Area Connection :




    Interlet Protocol -TCP/IP , .



    IP . OK . 192.168.0.8
    , :





       

  2. #2

    :


     

    :
    Status : Associated BSSID=00-08-C8-AC-7F-E0
    MAC Address :
    00-08-C8-AC-7F-E0
    MAC Address Media Access Control Address ( ) , .
    SSID
    Service Set IDentifier . . !
    D LINK default , .
    Tx Rate
    . .
    Channel
    , 1 , 3 , 6 11.
    Link Quality
    ,
    Signal Strength
    , .
    Data Rate


    SiteSurvey , , ( ) Connect , :



    , , , , , .
    . .

    , External Antenna. .
    , .
    ,
    , , Telnet .
    Internet Explorer.
    IP 192.168.0.50 , Enter ( , )
    . ***** , :




    , HTML , , HTML .
    , , Run Wizard ( !) SSID ( default ) ,




    , MAC Address IP . Log Log :




       

  3. #3

    :


     

    MAC .

    , , , Firmware .
    , . .




    . , .
    , UTP .
    , , , !
    , .

    . . :
    5 Hub peer to peer .
    5 , , .
    . , ADSL 5.
    , Hub 5. crossover :




    (user) , . (Desktop) My Network Places Search for Computers ...
    192.168.0.1 Search :


    .
    (user) 192.168.0.1 .

    (user) , , .

       

  4. #4

    :


     


    , , .
    , 100% .
    . DDoS Distributed Denial of Service , , . , zombies.
    , , .
    , , ! .
    , ! , , ( ) .
    Access Points, :
    SSID
    SSID Service Set IDentifier . . SSID = . ( , ) ( ) () SSID . (default). , !
    SSID SSID Broadcasting. , . , , () . () . , , .
    .
    , , , !
    MAC Address
    MAC Address Media Access Control Address . , . OSI Model Open System Interconnect Data Link MAC Address IP Address. .
    , MAC Address . MAC .
    WEP
    . WEP Wired *****alent Privacy , . WEP , .
    , , WEP Key Hex , . , .
    Default Password
    , Access Point, , , ***** ! . , .
    , , .


    , , .
    , 100% .
    . DDoS Distributed Denial of Service , , . , zombies.
    , , .
    , , ! .
    , ! , , ( ) .
    Access Points, :
    SSID
    SSID Service Set IDentifier . . SSID = . ( , ) ( ) () SSID . (default). , !
    SSID SSID Broadcasting. , . , , () . () . , , .
    .
    , , , !
    MAC Address
    MAC Address Media Access Control Address . , . OSI Model Open System Interconnect Data Link MAC Address IP Address. .
    , MAC Address . MAC .
    WEP
    . WEP Wired *****alent Privacy , . WEP , .
    , , WEP Key Hex , . , .
    Default Password
    , Access Point, , , ***** ! . , .
    , , .

    ,,,

       

  5. #5

    :


     

    IP Security IPSec .
    IP Security IPSec .
    :
    Man-IN-THe-Midle Sniffing Relaying SSL : Secure Socket Layer Encrypted 40Bit 128bit SSL SMTP Data**** communications

    SSL over HTTP HTTPS : Secure Hyper **** Transfer Protocol 443 80 HTTP ܡ ѡ
    TLS : Transport Layer Security SSL Certificates ***-****d Certificates .
    SMB Signing SMB : Server Message Block packets Sharing Man In The Middle MITM SMB Signing Hash (
    MD4 , MD5 , SHA-1 ) Hash Message or Packet Integrity .

    Application Layer OSI Model Packet IP Security IP Layer DOD Model Network Layer OSI Model Network Network Layer .IPSec IP Packet .
    IPSec Protocols
    IPsec IPSec :

    : AH : Authentication Header
    AH Sign Encryption :
    1. Data authenticity : .
    2. Data Integrity : ( ) .
    3. Anti-Replay : ѡ IPSec .
    4. Anti-Spoofing protection : IPSec subnet 192.168.0.X 192.168.1.x IP Address IPSec .( ) Packet Digitally signed.
    Packet AH




    : ESP : Encapsulating Security Payload
    Encryption and Signing Confidential Secret Public Network
    ESP :
    1.Source authentication : Spoofing IPSec ( ).
    2. Data Encryption : .
    3.Anti-Replay : AH .
    4.Anti-Spoofing Protection : AH.
    : IKE : Internet Key Exchange
    Keys IPSec negotiation IPSec Authentication ( IPSec 3DES Symmetric Encryption Private Key .
    IPSec , IPSec modes IPSec .
    IPSec modes IPSec .
    IPSec :
    1. Transport Mode
    2. Tunnel Mode .
    : Transport Mode
    LAN : Local Area Network IPSec Endpoint-to-Endpoint Encryption IPSec 23 Telnet ( Telnet Plain **** ) IPSec .
    Transport Mode :
    : Private LAN .
    : Firewall NAT : Network Address Translation ( Firewall IPs Packet Public IP IP One Public IP ) .
    : Tunnel Mode
    IPSec 2 Routers WAN : Wide Area Network FTP : File Transfere Protocol IPSec Tunneling Mode .

    ESP Packets AH , ESP Tunnel and Transport Modes

    IPSec :
    IPSec Benefits
    :
    Application Layer OSI Model Packet IP Security IP Layer DOD Model Network Layer OSI Model Network Network Layer .
    IPSec IP Packet .
    Encryption Encryption and decryption IPSec Layer 3 of the OSI Model Application Layer .
    IPSec HTTP , FTP , SMTP IPSec IPSec Policy . IPSec Encryption ( ESP) Digital Signing ( AH ) . . IPSec Domain OU : Organaizational Unit .
    IPSec Built-in IP Packet .

    IPSec ʿ
    Passive Network Monitering Active . ʡ IPSec IPSec .
    : Eavesdropping, sniffing or snooping
    Plain **** IPSec ʡ ǡ ( ) .

    : Data modification
    IPSec Hash ( ) Checksum ǡ .

    : Identity spoofing
    IPSec :
    Kerberos Protocol
    - Digital Certificates
    - Preshared key
    .

    : DoS -Denial of Service
    Flood . IPSec Ports .

    : MITM -Man In The Middle
    ʡ ѡ IPSec Authentication methods

    : Key interception
    IPSec WinXP .

    : Application Layer Attacks
    . IPSec IP Layer .

    IPSec ( ) Encryption Hashing .
    IPSec Algorithms
    Algorithm :
    Key : () .

    ,,,

       

  6. #6

    :


     

    HASH
    ( ) 1000 ǡ



    , , , ,
    Open Source ( MD5 ) .
    : MD4 :Message Digest 4 Birthday Attack - :
    http://mathworld.wolfram.com/BirthdayAttack.html
    http://mathworld.wolfram.com/BirthdayProblem.html
    MD5 : Message Digest 5 CIA .
    SHA-1 -Secure Hash Algorithm IE . ( CIA ) .
    One way process .




    IPSec (IPSec Structure) .
    IPSec Win2000 IPSec Deployment
    CISCO IPSec.
    IPSec .
    IPSec IPSec Policies IPSec .
    :


    * Traffic Type :
    ( ) HTTP FTP .
    * IPSec Traffic :
    IPSec Filter Action Policy ѡ IPSec FTP HTTP . Filter Action Encryption and Hashing Algorithms .
    * Authentication Method :
    IPSec :
    - Kerberos Protocol
    - Digital Certificates
    - Preshared key
    .
    ( )

    * IPSec Tunnel or Transport mode
    ( ) : .
    * What connection type the rule applies to:
    IPSec LAN Remote access WAN .
    Win2000 &2003 :
    -Client (Respond only)
    -Server(Request Security)
    -Secure Server (Require Security)

    .( ).
    Client (Respond only)
    Domain Group security policy IPSec IPSec IPSec IKE . IPSec Domain.

    Server (Request Security)
    Win2000 Non-win2000 Unix IPSec IPSec ( IPSec ). IPSec .

    Secure Server (Require Security)
    IPSec Trusted Sites and DOmains . IPSec SNMP - Simple Network Management Protocol .

    -------------------------------------------------------------------------
    ܡ Custom Policy .

    Firewall :
    UDP 500
    Protocol Identifier (ID) number 51 for AH , number 50 for ESP
    ( ID ).



    IPSec IPSec ******s 2000 IPSec ( 2150A 2810 ) .
    IPSec ( ) :



    . A B .
    2. IPSec Driver A A B .
    3. Negotiations Shared Key Secret Key IKE -Internet Key Exchange . Shared Key .
    4. IKE Two types of Agreements Security Associations SA . ǡ () .
    5. IKE A IPSec Driver IPSec Driver Hashes Data Integrity ( IPSec ) Data confidentiality .
    6. IPSec ǡ IPSec .
    7. IPSec Driver B Integrity () .

    IPSec ( ******s ) .

       


 

: 1 (0 1 )

     

  1. :-
    : 0
    : 07-18-2010, 09:16 AM
  2. :-
    : 0
    : 07-17-2010, 11:15 AM
  3. admin :-
    : 0
    : 12-22-2007, 01:30 PM

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