Générateur et Décodeur de Messages Secrets

Encrypt a message and share it with a code and secret key

100 % gratuit. Cet outil a besoin de notre serveur pour effectuer le travail : ce que vous soumettez y est traité puis supprimé, il n'est jamais conservé.

enhanced_encryption AES-256-GCM encryptedvisibility_off Key never stored in plain text
Your secret message
0 / 10000
Secret key
auto_awesome A strong random key will be generated automatically when you create the message.
Optional password (extra layer, shown to recipient separately)
Expires
One-time view

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À propos de cet outil

Encrypt a message and gives you a code plus a secret key to share separately - the recipient needs both the code and the key to decrypt and read the original message. Useful for sharing sensitive information (like a password or private note) more securely than plain text messaging.

Comment utiliser cet outil

  1. Write message to protectEnter the sensitive note you need to share securely.
  2. Encrypt and generate packageCreate encrypted ciphertext plus required decryption key.
  3. Share via separate channelsSend encrypted text and key through different communication paths.
  4. Recipient decrypts messageUse both pieces together to recover original plaintext safely.

Pourquoi l’utiliser

  • Improves confidentiality over plain-text messaging.
  • Simple workflow for one-time secret sharing.
  • Encourages safer channel separation practice.
  • Useful for ad-hoc secure communication needs.

Usages courants

  • Sharing temporary passwords with teammates.
  • Sending private notes across semi-trusted channels.
  • Delivering sensitive onboarding credentials securely.
  • Passing recovery keys or API secrets with reduced exposure.

Conseils pour de meilleurs résultats

  • Use separate channels (e.g., email + phone) for key and ciphertext.
  • Delete plaintext after confirming recipient decryption.
  • Set clear expiration/revocation policy for shared secrets.
  • Prefer dedicated enterprise secret-sharing tools for critical workflows.

Erreurs à éviter

  • Sending encrypted payload and key in the same chat thread.
  • Reusing same key repeatedly across many messages.
  • Leaving decrypted copies in shared screenshots or logs.
  • Assuming this replaces full end-to-end secure communication policy.

Questions fréquentes

If both were sent together in the same message, anyone intercepting that message would have everything needed to decrypt it - sending them through different channels (like the code via email and the key via text) adds a meaningful layer of protection.

Without the key, the encrypted message cannot be decrypted - there is no recovery mechanism, so make sure the key is shared successfully and kept safe until the message is read.

Encryption/decryption is designed to keep the message protected using the key you control - check the specific tool's handling, but the core design principle is that only someone with both the code and key can access the original content.

Yes. Secret Message is free for normal use with no account required, and ToolBox does not add a watermark to your result.

Most tools in this category run in your browser so the file stays on your device. If a tool needs a temporary server job, files are handled for that job only and are not kept as a lasting archive.

No install needed. Open Secret Message in your browser, add your file or paste your input, then download or copy the result.

Yes on modern mobile browsers. For large files, a desktop browser is usually faster and more reliable.

Try a different quality or format setting, use a smaller input, or open a related tool (for example compress before convert). Keep a copy of the original file before replacing it.

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