Its just a beginner's ppt

1. The Security that we render towards a
NETWORK is called
Bh Durga Adithya Varma , CSE-A , 12N31A0532

2. 1. Cryptography
2. Types of Cryptography
3. Steganography
4. Cyber Crime/Attack
5. Ethical Hacking
6. Fire Walling
7. Security Mechanisms
8. Security Services
9. Security Threats
Bh Durga Adithya Varma , CSE-A , 12N31A0532

3. CRYPTOGRAPHY
SUBSTITUTION CIPHERS
(replaces the original text with secret text, keeping the order as it is)
TRANSPOSITION CIPHERS
(replaces the original text with secret text, but changing its order)
Bh Durga Adithya Varma , CSE-A , 12N31A0532

4. Plain Text Letters:
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Cipher Text Letters:
Q W R T Y U I O P A S D F G H J K L Z X C V B N M
The text MEET ME AFTER SCHOOL BEHIND THE GYM
Is converted as DTTZD TQYZT KLEIG GSWTI OFRZI TUNDM
Bh Durga Adithya Varma , CSE-A , 12N31A0532

5. The text MEET ME AFTER SCHOOL BEHIND THE GYM
Is converted as EAMTN FTDIE EHTER HMEMB YESCG LOHO
Bh Durga Adithya Varma , CSE-A , 12N31A0532

6. 1.SECRET KEY CRYPTOGRAPHY
2.PUBLIC KEY CRYPTOGRAPHY
Bh Durga Adithya Varma , CSE-A , 12N31A0532

7. Plain Text Cipher Text
Cipher text Plain Text
Key
Encryption
Decryption
Bh Durga Adithya Varma , CSE-A , 12N31A0532

8. Encryption
Plain Text Cipher Text
Cipher text Plain Text
Decryption
Public Key
Private Key
Bh Durga Adithya Varma , CSE-A , 12N31A0532

9. (Crime is an illegal act if it is done in NETWORKING it is CYBER CRIME)

10. Security System that protect your PC’s or NETWORK from
HACKERS,INTRUDERS &MALICIOUS CODE
Bh Durga Adithya Varma , CSE-A , 12N31A0532

11. A mechanism that is designed to detect, prevent,
or recover from a security attack
Bh Durga Adithya Varma , CSE-A , 12N31A0532

12. 1. Normal Flow
2. Interruption
3. Interception
4. Modification
5. Fabrication
Bh Durga Adithya Varma , CSE-A , 12N31A0532

13. SECURITY THREATS
PASSIVE ATTACKS
(In this the goal of the attacker is to obtain information that is
being transmitted)
ACTIVE ATTACKS
(These attacks involve some modification of the Original Data Stream or
creation of False Stream)
Bh Durga Adithya Varma , CSE-A , 12N31A0532

14. CONCLUSION
Security is to be given to each and every Environments whether it is our
Personal Computing Environment
(or)
Time Sharing Environment
(or)
Client-Server Environment
(or)
Distributed Computing Environment.
Bh Durga Adithya Varma , CSE-A , 12N31A0532

15. Bh Durga Adithya Varma , CSE-A , 12N31A0532