Encrypt SECRET
text = SECRET
Result: Public key encrypts, private key decrypts.
Public vs Private Key Demo
EDUCATIONAL DEMONSTRATION ONLY. This demo illustrates the fundamental concept of asymmetric cryptography: a public key that everyone can use to encrypt, and a private key that only you hold to decrypt. Uses small RSA numbers so you can follow the math.
Privacy: this tool processes your data entirely in your browser. Nothing you paste or type is sent to the server.
Enter your values and press Calculate — the result appears here.
Worked examples
Frequently asked questions
Can the private key encrypt too?
Yes - signing uses the private key to sign a hash, and verification uses the public key to verify it. But the primary use of private key is decryption of messages encrypted with the public key.
How do I share my public key?
You can share it freely - post it on your website, embed it in certificates, etc. Only the private key must be kept secret.
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