Public-Key Tool: Encrypt

Encrypt a plaintext message using your recipient's public key. Once encrypted, only they can decrypt it with their private key — even you won't be able to read it. You may also want to try the key generation & decryption tool or the symmetric-key encryption tool.

Recipient's Public Key (not yours):

Plaintext (your message, max 20 characters for this demo):

Ciphertext (encrypted message to send):

About this tool: This uses 1024-bit RSA (public/private-key) encryption. The plaintext is limited to 20 characters for this educational demo because RSA can only encrypt small amounts of data directly. In practice, RSA is used to encrypt a symmetric key, which then encrypts the actual message.

Disclaimer: This is an educational demo and should not be used for truly sensitive messages. For real security, use Signal.

Credits: This tool uses the cryptico project.