CRYPTOGRAPHY and its applications .pptx

a short note on topic Cryptography

1. CRYPTOGRAPHY - Drishya T P

2. Contents Cryptography Encryption and Decryption Types of Cryptography Applications of Cryptography

3. Definition Cryptography : Cryptography is a technique of securing communication by converting plain text (readable text) into cipher text (unreadable format). It involves various algorithms and protocols to ensure data confidentiality, integrity, authentication, and non-repudiation .

4. Encryption : It is the process of converting normal message (plaintext) into meaningless message ( Cipher text). Encryption is the process which take place at sender’s end . Decryption It is the process of converting meaningless message ( Cipher text ) into its original form (Plaintext ). D ecryption is the process which take place at receiver’s end.

5. Types of Cryptography Symmetric Key Cryptography Asymmetric Key Cryptography Hash Functions Symmetric Key Cryptography It is an encryption system where the sender and receiver of a message use a single common key to encrypt and decrypt messages. The most popular symmetric key cryptography systems are Data Encryption Systems (DES) and Advanced Encryption Systems (AES).

6. Asymmetric Key Cryptography In Asymmetric Key Cryptography, a pair of keys is used to encrypt and decrypt information. A receiver’s public key is used for encryption and a receiver’s private key is used for decryption . Public keys and Private keys are different. Even if the public key is known by everyone the intended receiver can only decode it because he alone knows his private key . The most popular asymmetric key cryptography algorithm is the RSA algorithm. Hash Functions There is no usage of any key in this algorithm. A hash value with a fixed length is calculated as per the plain text which makes it impossible for the contents of plain text to be recovered.

7. Symmetric Key Cryptography Asymmetric Key Cryptography

8. Applications of Cryptography Computer passwords : Cryptography is widely utilized in computer security, particularly when creating and maintaining passwords . Secure web browsing : Online browsing security is provided by the use of cryptography, which shields users from eavesdropping and man-in-the-middle assaults . Electronic signatures : Electronic signatures serve as the digital equivalent of a handwritten signature and are used to sign documents . Authentication : Cryptography is used for authentication in many different situations, such as when accessing a bank account, logging into a computer, or using a secure network . End-to-end Internet Encryption : End-to-end encryption is used to protect two-way communications like video conversations, instant messages, and email.

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