CipherOnce

CipherOnce User Manual

Secure, private, one-time secret and file sharing — built with a zero-knowledge mindset.

What is CipherOnce?

CipherOnce is a privacy-first platform that allows you to share sensitive information and files that can be accessed only once and are automatically destroyed after viewing or expiration.

All encryption happens client-side. CipherOnce servers never see your secrets in plaintext, ensuring zero-knowledge security.

How CipherOnce Works

1. Create a Secret

  1. Go to the Create Secret page.
  2. Enter sensitive text such as passwords, API keys, private notes, or messages.
  3. Optionally attach a file (encrypted before upload).
  4. Set expiration time or maximum view count.
  5. Add an optional passphrase for extra protection.
  6. Click Create Secret.

2. Share the Secret Link

  1. You’ll receive a unique, one-time secret link.
  2. Copy the entire URL, including the part after the#.
  3. This fragment contains the encryption key and is never sent to the server.
  4. Share the link securely with the intended recipient.
  5. If you used a passphrase, share it separately.

3. Viewing a Secret

  1. The recipient opens the link.
  2. Passphrase (if set) is required.
  3. Secret is decrypted locally in the browser.
  4. Once viewed, the secret is permanently destroyed.

Security & Privacy Model

  • Client-side encryption: Encryption keys never leave your device.
  • Zero-knowledge design: Servers store only encrypted data.
  • One-time access: Secrets self-destruct after viewing.
  • Metadata logging: Only access-related metadata (IP, user agent, timestamps) is logged for abuse prevention.
  • No tracking: No ads, trackers, or behavioral profiling.

What Can You Share?

  • Passwords, API keys, tokens
  • Private messages or credentials
  • Confidential documents and files
  • Legal, financial, or technical data

Troubleshooting

  • Ensure the full link including #key is copied.
  • Some messaging apps strip URL fragments — double check.
  • Secrets cannot be recovered once viewed or expired.
  • On iOS, files may open in a new tab instead of downloading.

Contact the Developer

CipherOnce is actively developed and security-reviewed. If you discover a bug, security issue, or need support:

📧 gairhedurga13@gmail.com

Responsible disclosure is appreciated.