Cryptography is the process of securing communication and information by converting plain text into cipher text using cryptographic algorithms and keys. There are two main types: symmetric key cryptography which uses a single private key for encryption and decryption and is faster but less secure, and asymmetric key cryptography which uses two different keys (public and private) and is more complex but more secure. The purpose of cryptography is to defend against hackers and securely transmit sensitive information such as financial transactions, intellectual property, and other private communications.

1. By Kajal Chaudhari
Roll No.: 30
Cryptography in networks.

2. • Cryptography derived its name from a Greek word
called “Kryptos” which means “Hidden Secrets”.
• Cryptography is a method of storing and transmitting
data in a particular form so that only those for whom it
is intended can read and process it.
• The term is most often associated with scrambling
plaintext (ordinary text) into cipher text (a process
called encryption), then back again (known as
decryption).
What is cryptography?

3. Bob Alice

5. Types of Cryptography
(Secret key) (Public key)

6. Asymmetric key cryptography: (Public key)
• Two different keys are used for encryption
and decryption.
• More secured, relatively complex

7. Symmetric key cryptography (private key)
• Only one key is used for encryption and decryption
• It is simple and faster
• Less secured

8. Purpose of cryptography
• Defending against external/internal
hackers
• Securing E-commerce
• Securing bank accounts/electronic
transfer
• Securing intellectual property
• Avoiding liability

9. Thank you!!