start learning security. crypto basics

1. Presented by :- Shrawan Singh

2. Need for security
Client Server
Customer id: 789910
Order id: 90
Item id: 150
Credit card no.
1234567890
Issued by: visa
Valid till: 2017
Server
database
Example of security mechanisms
1. provide a user id and password to every user and use that
information to authenticate a user.
2. Encode information stored in the database in some fashion so
that it is not visible to user who don’t have right permission.

3. Basic security model
No security
Security through obscurity
Host security
Network security

4. Principles of security
Confidentiality
Authentication
Integrity
Non-repudiation
Access control
Availability

5. Confidentiality
A
c
BSecret

6. A
c
BI am user
A
Authentication

7. Integrity
A
c
B
Transfer
$100
To d
Transfer
$1000
To d
Actual route of the message
Ideal route of the message

8. Non-repudiation
A B
I never sent that message , which
you claim to have received

9. Availability
A
c
B

10. Type of attacks
Attacks
Passive
attacks
Active
attacks