Asymmetric Cryptography 🔐🔑

Overview 🌟

Asymmetric cryptography, also known as public key cryptography, involves using a pair of keys for encryption and decryption. Unlike symmetric encryption, where the same key is used for both operations, asymmetric cryptography employs different keys.

Key Concepts 🗝️

1. Key Pairs:

   • Private Key: Kept secret and used for decryption.

   • Public Key: Shared openly and used for encryption.

   • Generation: Each party generates a private key and derives a corresponding public key.

2. Encryption and Decryption:

   • Encryption: Suzanne uses Darryl's public key to encrypt a message.

   • Decryption: Darryl uses his private key to decrypt the message.

   • Reverse Operation: Darryl uses Suzanne's public key to encrypt his reply, and Suzanne uses her private key to decrypt it.

3. Public Key Signatures:

   • Digital Signature: Suzanne signs her message with her private key.

   • Verification: Darryl uses Suzanne's public key to verify the message's authenticity and integrity.

   • Tamper Detection: Any modification to the message will cause the signature validation to fail.

Functions of Asymmetric Cryptography 🛡️

1. Confidentiality:

   • Achieved through encryption, ensuring that the message remains private and secure from unauthorized parties.

2. Authenticity:

   • Verified by digital signatures, confirming that the message was not altered and came from the claimed sender.

3. Non-Repudiation:

   • Ensures that the sender cannot deny the origin of the message, providing proof of the message's authenticity.

Summary 📈

• Asymmetric Cryptography: Uses a pair of keys (public and private) for encryption and decryption.

• Public Key Signatures: Enable verification of the sender’s identity and message integrity.

• Key Benefits: Provides confidentiality, authenticity, and non-repudiation in communications.

🔐📜🛡️