Cryptography and
Network Security
Presented by
1. Shubhangi Gosake (21121)
2. Sanskruti Gosake (21219)
3. Nutan Waghmode (21268)
4. Supriya Koli (21160)
5. Bhavana Sonawane (21159)
*
Table of Content
1. What is security?
2. Attacks
1.Active attack
2.Passive attack
3.What is cryptography?
1.Asymmetric
2.Symmetric
4.Firewall
What is Security?
 Network security is a broad term that covers a multitude of
technologies, devices and processes.
 It refers to a set of rules and configurations designed to protect the
integrity, confidentiality, and accessibility of computer networks and
data.
 Network security is any activity designed to protect the usability and
integrity of your network and data.
• It includes both hardware and software technologies
• It targets a variety of threats]
• It stops them from entering or spreading on your network
• Effective network security manages access to the network
Active attacks
 Active attacks are the type of attacks in which, The attacker
efforts to change or modify the content of messages.
 Active Attack is danger for Integrity as well as availability.
 Due to active attack system is always damaged and System
resources can be changed.
 The most important thing is that, In active attack, Victim gets
informed about the attack.
Passive Attack
 Passive Attacks are the type of attacks in which, The attacker
observes the content of messages or copy the content of
messages.
 Passive Attack is danger for Confidentiality.
 Due to passive attack, there is no any harm to the system.
 The most important thing is that In passive attack, Victim does
not get informed about the attack.
What is cryptography ?
 Cryptography derived its name from a Greek word called “krypto’s” which
means “Hidden Secrets”.
 Cryptography is the practice and study of hiding information.
 It is the Art or Science of converting a plain intelligible data into an
unintelligible data and again retransforming that message into its original
form.
 It provides Confidentiality, Integrity, and Accuracy.
• Plain Text: The message which we send to the receiver. For e.g.- “Hello”
• Cipher Text: Conversion of that plain text into a non-readable format. For e.g.“H@#$5”
Asymmetric Cryptography
 Under this system , a pair of keys is used to encrypt and decrypt
information.
 A public key is used for encryption and a private key is used for
decryption.
 Public key and Private Key are different, even if the public key is
known by everyone the intended receiver can only decode it
because he alone knows the private key.
 The public key is available to the public, and the private key is
available only to an individual.
Symmetric key Cryptography
 It is an encryption system where the sender and receiver of
message use a single common key to encrypt and decrypt
messages.
 Symmetric Key Systems are faster and simpler but the problem is
that sender and receiver have to somehow exchange key in a
secure manner.
 The most popular symmetric key cryptography system is Data
Encryption System(DES).
Firewall
 A firewall is a network security system that manages and regulates the
network traffic based on some protocols. A firewall establishes a barrier
between a trusted internal network and the internet.
 Firewalls are commonly used in private networks or intranets to prevent
unauthorized access from the internet.
 Firewalls exist both as software that run on a hardware and as hardware
appliances.
Thank You