RSA Encryption Tool

Encrypt your data using RSA asymmetric encryption with public-private key pairs.

Need to decrypt data?

RSA Key Settings

Encrypted Output

Encrypted output will appear here

Note about RSA Encryption:

  • RSA is an asymmetric encryption algorithm - data encrypted with the public key can only be decrypted with the private key
  • Keep your private key secure and never share it - only the public key should be shared
  • RSA can only encrypt limited amounts of data (key size dependent)
  • For large data, the content is automatically split into chunks
  • You'll need the corresponding private key to decrypt this data

Key Size Recommendations:

  • 2048 bits: Recommended minimum for new applications
  • 3072 bits: Enhanced security for sensitive data
  • 4096 bits: Maximum security but slower performance
  • 1024 bits: Legacy support only (not recommended for new use)

About RSA Encryption

Understanding RSA

RSA (Rivest-Shamir-Adleman) is one of the first public-key cryptosystems widely used for secure data transmission. It's an asymmetric encryption algorithm that uses a pair of keys: a public key for encryption and a private key for decryption.

Core Specifications:

  • Algorithm Type: Asymmetric (public-key) encryption
  • Key Options: 1024, 2048, 3072, or 4096 bits
  • Mathematical Basis: Integer factorization problem
  • Structure: Public-private key pair system

Asymmetric Encryption Explained

RSA employs asymmetric encryption, using different keys for encryption and decryption. This eliminates the need for secure key sharing, making it ideal for secure communications between parties who have never met.

Asymmetric Encryption Advantages:

  • No shared secret key required
  • Secure communication without prior contact
  • Digital signatures and authentication
  • Non-repudiation capabilities

Security Foundation

🔐 Mathematical Security:

RSA security relies on the computational difficulty of factoring large integers, specifically the product of two large prime numbers.

  • Based on well-studied mathematical problem
  • Security increases exponentially with key size
  • Resistant to classical computational attacks
  • Quantum-vulnerable (requires quantum-resistant alternatives for future)

Choose RSA for applications requiring secure key exchange, digital signatures, or when secure communication channels haven't been established.

Key Size Considerations

  • 1024-bit: Legacy support only, vulnerable to modern attacks
  • 2048-bit: Current minimum recommendation for new systems
  • 3072-bit: Enhanced security equivalent to 128-bit symmetric encryption
  • 4096-bit: Maximum security with significant performance impact

Performance vs Security Trade-off:

Larger keys provide better security but require more computational resources for encryption and decryption operations.

RSA Limitations

  • Limited data size per encryption operation
  • Slower than symmetric encryption for large data
  • Key generation is computationally intensive
  • Vulnerable to timing attacks without proper implementation
  • Requires secure random number generation
  • Not suitable for real-time streaming encryption

Industry Applications

RSA is fundamental to modern internet security, powering SSL/TLS certificates, email encryption, and digital signatures across countless applications worldwide.

Real-World Usage:

  • SSL/TLS certificate authentication
  • Email encryption (PGP/GPG)
  • Software code signing
  • VPN and secure tunneling protocols
  • Cryptocurrency and blockchain systems
  • Digital document signing
  • Secure key exchange for symmetric encryption
  • Identity verification and authentication systems

Best Practices

Key Management:

Store private keys securely, use hardware security modules for high-value applications.

Hybrid Encryption:

Combine RSA with symmetric encryption for optimal security and performance.

Implementation:

Use well-tested cryptographic libraries and follow security guidelines.

Future Considerations

While RSA remains secure against classical computers, the advent of quantum computing poses a potential threat. Organizations should plan migration to quantum-resistant algorithms.

Quantum Readiness:

  • Monitor NIST post-quantum cryptography standards
  • Plan for gradual migration to quantum-resistant algorithms
  • Maintain crypto agility in system design
  • Consider hybrid approaches during transition period