RSA Encryption/Decryption Tool

RSA is an asymmetric encryption algorithm that uses a pair of keys: a public key for encryption and a private key for decryption. This tool supports key generation (1024/2048/4096-bit), PKCS1 v1.5 and OAEP padding schemes, and multiple hash algorithms.

Generate RSA Key Pair
Encrypt
Decrypt
What is RSA?

RSA (Rivest-Shamir-Adleman) is a public-key cryptosystem that is one of the oldest and most widely used asymmetric encryption algorithms. Unlike symmetric encryption, RSA uses two different keys: a public key that can be freely shared for encryption, and a private key that must be kept secret for decryption.

RSA is commonly used for secure data transmission, digital signatures, and key exchange. While powerful, RSA is slower than symmetric algorithms and can only encrypt small amounts of data directly. For larger data, RSA is typically used to encrypt a symmetric key, which then encrypts the actual data (hybrid encryption).

Key Features
  • Asymmetric encryption with public/private key pairs
  • Key sizes: 1024, 2048, or 4096 bits (2048-bit recommended)
  • Padding schemes: PKCS1 v1.5 (legacy) and OAEP (recommended)
  • OAEP hash algorithms: SHA-1, SHA-256, SHA-384, SHA-512
Security Notice

RSA-2048 with OAEP padding and SHA-256 is considered secure for most applications. RSA-1024 is deprecated and should not be used for new applications. RSA-4096 provides the highest security but with performance trade-offs.

Never share your private key. All encryption/decryption operations are performed locally in your browser - no keys are transmitted to any server.

Privacy & Security

All RSA operations including key generation, encryption, and decryption are performed entirely in your browser using the forge library. Your keys and data never leave your device, ensuring complete privacy and security.