The document discusses different methods of encryption, comparing symmetric and asymmetric encryption. Symmetric encryption uses a single key for both encryption and decryption, while asymmetric encryption utilizes a pair of keys (public and private) for secure communication. It also distinguishes between encoding, encryption, and hashing, highlighting their purposes and reversibility.

1. ENCRYPTION
MEDHAT HUSSAIN

2. AGENDA
• UNENCRYPTED COMMUNICATION
• ENCRYPTED COMMUNICATION
• SYMMETRIC ENCRYPTION
• ASYMMETRIC ENCRYPTION
• ENCODING VS ENCRYPTION VS HASHING

3. UNENCRYPTED COMMUNICATION

4. SYMMETRIC ENCRYPTION
• ONE KEY TO BE USED BY BOTH SIDES FOR THE ENCRYPTION AND THE
DECRYPTION.
• THE KEY SHOULD BE COMMUNICATED TO BOTH SIDES BEFORE STARTING THE
COMMUNICATION.
• PACKETS CAN BE DECRYPTED BY ANY THIRD-PARTY WHO HAS THE KEY.

5. SYMMETRIC ENCRYPTION

6. ASYMMETRIC ENCRYPTION
1. KEYS GENERATION (PRIVATE AND PUBLIC).
2. PUBLIC KEYS COMMUNICATION.
3. START THE COMMUNICATION (ENCRYPTION AND DECRYPTION)

7. ASYMMETRIC ENCRYPTION
• EACH TERMINAL GENERATES HIS OWN TWO KEYS (PRIVATE AND PUBLIC)
• EACH TERMINAL SHARES HIS PUBLIC KEY WITH THE OTHER TERMINAL.
• PRIVATE KEYS ARE USED TO DECRYPT THE MESSAGES SENT TO ME.
• USE THE RECEIVER’S PUBLIC KEY TO ENCRYPT/SEND HIM A PACKAGE.
• NO WAY TO GET THE PRIVATE KEY FROM THE PUBLIC KEY

8. ASYMMETRIC ENCRYPTION
Private
Public
Private
Public
Public Public
Terminal A Terminal B

9. ASYMMETRIC ENCRYPTION
Private A Private B
Public B Public A
Terminal A Terminal B
EncryptionEncryption
Decryption
TEXT A
TEXT A
Decryption
TEXT B
TEXT B

10. ASYMMETRIC ENCRYPTION

11. ENCODING VS ENCRYPTION VS HASHING
• ENCODING: REVERSIBLE AND MAINLY FOR ERROR CORRECTION.
• ENCRYPTION: REVERSIBLE AND MAINLY USED FOR DATA PROTECTION.
• HASHING: IRREVERSIBLE AND MAINLY USED FOR DATA VERIFICATION.

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MEDHAT HUSSAIN