Skip to main content

Network System and Security Part-1

 

1. Plaintext (اصل Data / Original Message)

Plaintext wo normal readable data hota hai jo kisi ne likha ho ya bhejna ho, bina kisi protection k.

Example:
Agar aap WhatsApp pe likho:
"Hello Manan, Meet me at 5pm" – ye plaintext hai.
Ye kisi bhi banda easily parh sakta hai.

2. Ciphertext (خفیہ Data / Hidden Message)

Ciphertext wo data hota hai jo encrypt (lock) kia gaya hota hai taake koi doosra usay na parh sakay.

Example:
Agar "Hello Manan" ko encrypt karo to ban sakta hai:
"Xlwwr Qfrfr"
Ab ye ciphertext hai. Sirf jis k paas key hogi wo isay wapas original me badal sakta hai.

3. Encryption (Lock Karna / Data ko Secure Karna)

Encryption ka matlab hota hai plaintext ko ciphertext me badalna – yani data ko lock kar dena.

Example:
Aapka message: "Meet me at 5pm"
Encryption k baad: "Pfhy ph cv 5ro"
Ab ye safe hai, koi beech me data churaye to bhi samajh nahi sakta.

4. Decryption (Unlock Karna / Data ko Wapas Readable Banana)

Decryption ka matlab hota hai ciphertext ko wapas plaintext me laana – yani data unlock karna.

Example:
Ciphertext: "Pfhy ph cv 5ro"
Decryption k baad: "Meet me at 5pm"

5. Cryptography (Data ko Secret bananay ka Science)

Cryptography wo technique ya science hoti hai jis se hum encryption aur decryption karte hain.

Example:
Jese WhatsApp apna system use karta hai messages ko secure karne k liye – ye cryptography hai.
Ye ensure karta hai k sirf sender aur receiver hi message parh sakay.

6. Cryptoanalyst (Jo lock toray / Hacker-type ya Security Expert)

Cryptoanalyst wo banda hota hai jo encryption torne ki koshish karta hai – ya to good purpose (security test) ya illegal purpose.

Example:
Agar koi hacker aapka encrypted message tor k samajhne ki koshish kare, to wo cryptoanalyst kehlay ga.

🔐 Ek Simple Real-Life Example:

  • Plaintext: "ATM PIN is 1234"

  • Encryption (Lock): "XTD YKL QN 5678"

  • Ciphertext: "XTD YKL QN 5678"

  • Decryption (Unlock): "ATM PIN is 1234"

  • Cryptography: Yeh pura process jise encryption/decryption hota hai.

  • Cryptoanalyst: Jo is ciphertext ko bina key ke unlock karne ki koshish kare.

Comments

Post a Comment

Popular posts from this blog

TCP/IP MODEL

  HISTORY OF TCP/IP MODEL THE TCP/IP MODEL WAS DEVELOPED BY VINT CERF AND BOB KAHN IN THE 1970S. THEY WERE BOTH WORKING AT THE DEFENSE ADVANCED RESEARCH PROJECTS AGENCY (DARPA) AT THE TIME. Vint Cerf And Bob Kahn CERF AND KAHN WERE TASKED WITH DEVELOPING A NEW NETWORK PROTOCOL THAT WOULD BE MORE RELIABLE AND EFFICIENT THAN THE EXISTING PROTOCOLS. THEY CAME UP WITH THE IDEA OF USING A LAYERED APPROACH, WHICH WOULD ALLOW EACH LAYER TO FOCUS ON A SPECIFIC TASK. THIS LED TO THE DEVELOPMENT OF THE TCP/IP MODEL, WHICH IS STILL THE BASIS FOR HOW DATA IS TRANSMITTED OVER THE INTERNET TODAY. CERF AND KAHN ARE OFTEN REFERRED TO AS THE "FATHERS OF THE INTERNET" FOR THEIR WORK ON THE TCP/IP MODEL. THEY WERE INDUCTED INTO THE NATIONAL INVENTORS HALL OF FAME IN 2004 FOR THEIR CONTRIBUTIONS TO THE DEVELOPMENT OF THE INTERNET. HERE ARE SOME OTHER NOTABLE PEOPLE WHO CONTRIBUTED TO THE DEVELOPMENT OF THE TCP/IP MODEL: JON POSTEL: POSTEL WAS THE FIRST CHAIRMAN OF THE INTERNET ENGINEERI...
Post a Comment
Read more

About Me Information

HELLO FRIENDS, I HOPE YOU ALL ARE DOING WELL. I AM MAKING THIS BLOG FOR THE INFORMATION OF NETWORKING ABOUT. IN THIS BLOG WE WILL READ CCNA (200-301) AND ITS RELATED AND NETWORK RELATED INFORMATION. MY NAME IS ABDUL MANAN JAVED MANJ MY AGE IS 21 YEAR    I AM STUDED ABOUT NETWORK  TECHNOLOGY EMAIL ID : mananrajpoot449@gmail.com CONTACT NO : +923486777628 ADDRESS : ISLAMABAD,G7,KHADA MARKET My Website   My Facebook Account My Facebook Page My Linkedin Profile _____________________________ CONTENT ABOUT  HIS BLOGG 1.  Computer Network 2.   What Is Internet 3.   Network Architecture 4.  Osi Refrence Model 5.  Operating System 6.  Internet Protocol (Ip) 7.  Internet Protocol Types 8.   Port Number 9.  Mac-Address 10.    WHAT IS HUB 11.   WHAT IS SWITCH 12.   WHAT IS ROUTER 13.   WHAT IS NETWORK 14.   NETWORK CABLES 15.   ROUTING 16.  Data Transmission 17...
Post a Comment
Read more

Internet Protocol (IP) Address

  IP ADDRESS IT IS A UNIQUE ADDRESS THAT WE CAN ASSIGN TO DEVICE .SO THAT DEVICECAN COMMUNICATE WITH EACH OTHER. WE CANNAOT ASSIGN SAME IP ADDRESS IN ANY TWO DEVICES IN OUR NETWORK. IF WE WILL DO THIS THEN IT WILL BE  CAUSE A CONFLICT ERROR. TWO VERSION OF IP ADDRESS: 1: IPV4 ; 2: IPV6 ; IPV4 32 BITS AND IPV6 128 BITS. AN IP ADDRESS, OR INTERNET PROTOCOL ADDRESS, IS A SERIES OF NUMBERS THAT IDENTIFIES ANY DEVICE ON A NETWORK.  COMPUTERS USE IP ADDRESSES TO COMMUNICATE WITH EACH OTHER BOTH OVER THE INTERNET AS WELL AS ON OTHER NETWORKS. TO FIND THE IP ADDRESS CLASS WE NEED TO LOOK AT THE FIRST DIGIT OF THE IP ADDRESS. AND BY LOOKING AT THE FIRST DIGIT, WE CAN GUESS THE SUBNET MASK TO WHICH CLASS IT BELONGS. CLASS A IP ADDRESS SUBNET MASK 255.0.0.0 CLASS B IP ADDRESS SUBNET MASK  255.255.0.0  CLASS C IP ADDRESS SUBNET MASK 255.255.255.0 IANA TABLE IP RANGES                 IANA   ( Internet Assigned Numbers Au...
Post a Comment
Read more