RSA Encryption & Decryption
Asymmetric encryption using RSA algorithm. Uses separate public key for encryption and private key for decryption.
Best Online RSA Public & Private Key Encryption Tool
Need to quickly verify asymmetric encryption or unwrap a secure payload? CodeToolTip offers the safest online RSA encryption and decryption utility. Whether you are generating digital signatures or exchanging secure AES keys, our tool parses standard PEM formatted keys instantly. We serve as a strictly client-side, zero-knowledge alternative to legacy tools like Devglan, CyberChef, and Online-RSA.
Why Use CodeToolTip for RSA?
- Zero-Knowledge Architecture: Pasting a Private Key online is generally dangerous. However, CodeToolTip guarantees 100% offline Javascript processing. We have no backend databases to harvest your RSA private key.
- Standard PEM Support: Automatically parses `-----BEGIN PUBLIC KEY-----` and `-----BEGIN RSA PRIVATE KEY-----` formats.
- Modern Cryptography: Supported by the robust `jsencrypt` library, easily handling standard 1024-bit, 2048-bit, and 4096-bit prime calculations.
How to use RSA Encryption?
- Paste your robust Public Key (to encrypt) or Private Key (to decrypt).
- Enter the short string data (like a password or AES key) you wish to process.
- Click Encrypt to yield Base64 ciphertext, or Decrypt to yield plaintext.
- Use the copy buttons to cleanly move the payload to your codebase or API tests.
RSA Encryption FAQ
What is RSA Encryption?
RSA is an asymmetric cryptographic algorithm invented by Rivest, Shamir, and Adleman. It uses a mathematically linked pair: a public key (shared openly to encrypt messages intended for you) and a private key (kept absolutely secret to read those messages).
Is it really safe to paste my private key here?
Yes. CodeToolTip operates exclusively inside your browser (Client-Side). If you use tools like Devglan, your private key travels across the internet to their Java servers. With us, your RSA public private key workflow is offline and untraceable.
Why am I getting a length limit error?
Unlike AES Encryption, RSA is computationally heavy and mathematically limited by key size. A 2048-bit key can only encrypt roughly 245 bytes. Industry standard dictates generating a random AES key, encrypting the large file with AES, and then using RSA to encrypt just the tiny AES key.
Quick Tips
- RSA is an asymmetric algorithm using two linked keys (public and private).
- Usually, you encrypt with the public key and decrypt with the private key.
- Maximum data size for RSA depends on the key size (e.g., 2048-bit fits ~245 bytes).
- PEM format starts with -----BEGIN PUBLIC KEY----- and ends with -----END PUBLIC KEY-----.