Asymmetric Encryption Tool

Introduction to Asymmetric Encryption

Asymmetric encryption is a method that uses a pair of keys (public and private keys) for encryption and decryption. The public key can be shared openly for encryption, while the private key must be kept secret for decryption. This design solves the key distribution problem inherent in symmetric encryption.

RSA Algorithm

RSA (Rivest-Shamir-Adleman) is one of the most widely used asymmetric encryption algorithms. It is based on the mathematical problem of integer factorization, providing a high level of security. RSA can be used not only for encryption but also for digital signatures, verifying data integrity and origin.

Key Length and Security

The security of RSA primarily depends on key length. As computational power increases, recommended RSA key lengths are also increasing:

• 1024-bit: No longer recommended for high-security requirements, but still used in some low-security scenarios.
• 2048-bit: Currently considered secure and suitable for most applications.
• 4096-bit: Provides higher level of security, suitable for scenarios with extremely high security requirements, but slower processing speed.

Applications of Asymmetric Encryption

Asymmetric encryption is particularly useful in the following scenarios:

• Secure Communication: Such as TLS/SSL in HTTPS protocol for establishing secure connections.
• Digital Signatures: Verifying message integrity and origin.
• Key Exchange: Securely exchanging symmetric encryption session keys.
• Authentication: Proving identity without sharing passwords.
• Email Encryption: Such as PGP (Pretty Good Privacy).

Advantages and Disadvantages of Asymmetric Encryption

Advantages:

• Solves the key distribution problem
• Provides digital signature functionality
• Enhances authentication capabilities
• No need for pre-shared keys

Disadvantages:

• High computational complexity, slower encryption and decryption
• Not suitable for large data encryption
• Longer key lengths required
• Higher computational resource requirements

Security Recommendations

When using asymmetric encryption tools, please note the following security recommendations:

• Private keys must be properly safeguarded and never exposed
• For important data, use 2048-bit or longer keys
• RSA encryption has data length limitations and is not suitable for direct large file encryption
• In practical applications, typically used in combination with symmetric encryption (hybrid encryption)
• All encryption and decryption operations are performed locally in your browser and are not transmitted to our servers