Hybrid envelope
Public key or certificate plus message text.
JSON envelope containing algorithm names, wrapped key, IV, and ciphertext.
Security Tools
Message Encrypt and Decrypt
Encrypt and decrypt messages locally with RSA-OAEP public/private PEM keys.
At a glance: This message encryption tool runs locally in your browser. It encrypts messages with AES-GCM and wraps the AES key with RSA-OAEP SHA-256 from a pasted or uploaded public key/certificate, then decrypts with the matching private key.
Your input is processed locally in your browser and is not uploaded to ByteBench servers.
Loading browser tool.
How to use this tool
- Paste or type your input into the tool area.
- Choose the mode or options that match your task.
- Review validation messages before copying the output.
- Use the example button when you want a known-good starting point.
Examples
Common use cases
- Encrypt a message for someone with their public certificate.
- Decrypt a local test envelope with a private key.
- Check PEM key compatibility without uploading secrets.
When to use this tool
Use this message encryption page when you need to encrypt and decrypt messages with uploaded public and private keys quickly during debugging, review, migration, or documentation work and want to keep raw input in your browser session.
If your task shifts, Hash Generator and Hash and Checksum Validator are usually the next useful tools.
Input and output expectations
- Expected input shape: Paste non-production-safe sample data when possible and verify selected algorithm or key mode before running.
- Typical output: Locally generated hashes, checks, decoded claims, or encrypted envelopes for development workflows.
- Quick input example: Public key or certificate plus message text.
- Quick output example: JSON envelope containing algorithm names, wrapped key, IV, and ciphertext.
Common mistakes to avoid
- Treating legacy algorithms like MD5 or SHA-1 as secure defaults.
- Confusing decode/inspection results with trust validation.
- Copying sensitive material from shared sessions or recorded screens.
Notes and edge cases
Private keys are sensitive. This tool reads PEM material locally in the browser and does not upload it, but you should still avoid using production private keys on shared machines or screen shares.
For privacy-sensitive data, keep using the tool in a trusted browser session and avoid pasting secrets into shared screens, screenshots, browser extensions, or remote support sessions.
FAQ
Does this message encryption tool upload my input?
No. This message encryption tool runs in your browser and does not send your input to ByteBench servers.
What input format works best in this message encryption tool?
Use clean RSA-OAEP and AES-GCM local encryption input and run the example first when you want a known-good baseline. If your pasted data came from logs or docs, remove accidental wrappers before validating or converting.
How should I validate results from this message encryption tool?
Review the status message, compare output with expected behavior, and run one quick edge-case check. ByteBench helps with utility work, but production-critical output should still be verified in your project pipeline.