CipherOnce encrypts your passwords, API keys, and confidential messages client-side — generating a self-destructing link that vanishes after one view or expiration. No server ever sees your plaintext.
Every time you paste a password into Slack or email an API key, you're creating a permanent record that lives in server logs, backups, and breach databases — invisible to you, accessible to attackers.
Real-World Breach Scenario
A developer shares database credentials via Slack. Six months later, an attacker gains access to the workspace. The message was "deleted" — but message retention exports are recoverable. Full database compromise follows within hours.
Email Inboxes
Messages persist indefinitely across backups, servers, and third-party integrations — long after you think they're gone.
Chat & Slack
Workspace breaches expose years of message history. Deleted messages are recoverable by platform administrators.
Cloud Storage
Shared drives retain version history. A single permission misconfiguration can expose sensitive data to anyone.
CipherOnce eliminates the attack surface entirely.
Secrets expire. Links self-destruct. Nothing persists.
Military-grade protection that takes seconds to set up.
Your secret is encrypted directly in your browser using AES-256-GCM before any data leaves your device. The server receives only ciphertext — never plaintext.
A unique, time-limited URL is generated. The decryption key is embedded in the URL fragment (#) — never transmitted to our servers. Only the link holder can decrypt.
After the recipient views the secret — or upon expiration — the encrypted payload is permanently deleted from all storage. No recovery. No residue.
AES-256-GCM Encryption
Industry-standard authenticated encryption with 256-bit keys and a unique IV per secret.
Client-Side Key Derivation
Encryption keys are generated locally and embedded in the URL fragment, never sent to any server.
Zero Server-Side Knowledge
Our infrastructure stores only ciphertext. Without the URL fragment, no one — including us — can decrypt your data.
Guaranteed Deletion
Atomic deletion on first access. Database entries are purged immediately; no soft-deletes or recovery paths exist.
Every feature engineered for security professionals and teams who can't afford to compromise.
Every secret is encrypted client-side with the gold standard in authenticated encryption — the same algorithm used by the U.S. government for classified data.
Our servers receive only ciphertext. The decryption key travels exclusively in your URL fragment, invisible to our infrastructure and network logs.
Set secrets to expire in 1 hour, 24 hours, 7 days, or on first view. Choose what fits your threat model. Expired data is deleted automatically.
Configure any secret for single-view destruction. The moment someone opens it, the ciphertext is purged from storage — unrecoverable by anyone.
Share plaintext messages, passwords, API keys, or encrypted file attachments up to 100MB. Full end-to-end protection for every format.
Receive an instant alert the moment your secret is accessed. Know exactly when your data was viewed without compromising zero-knowledge guarantees.
Start sharing in seconds with no account, no email, no tracking. Your identity is never linked to your secrets.
Our encryption implementation is fully open-source and independently auditable. Trust through verification, not promises.
Integrate CipherOnce into your CI/CD pipeline, secret rotation workflows, or custom tooling via our clean REST API.
From solo developers to Fortune 500 security teams, CipherOnce handles the secrets that matter most.
We don't ask you to trust us. We show you the architecture and let you verify it yourself.
Encryption happens entirely within your browser using the Web Crypto API before any data is transmitted. We use AES-256-GCM — an authenticated encryption mode that guarantees both confidentiality and integrity. A unique 256-bit key and 96-bit IV are generated for every single secret.
The decryption key is embedded exclusively in the URL fragment (the # portion). URL fragments are never transmitted to web servers by design — it's a browser standard. Our infrastructure receives only ciphertext that it cannot decrypt under any circumstance, including lawful government requests.
Every access event is cryptographically logged — not to surveil you, but to ensure atomic deletion. The moment a one-time secret is accessed, the deletion is executed in the same database transaction as the read. There is no window where both reading and retention can coexist.
CipherOnce uses strict TTL (time-to-live) enforcement at the storage layer. Expired secrets are purged during the next cleanup cycle with no soft-delete or recovery path. Our data retention policy is zero for expired content — this is enforced at the infrastructure level, not application logic.
General-purpose communication tools were not designed with secrets in mind. The difference is architectural, not cosmetic.
CipherOnce was built exclusively for secrets — not retrofitted from a general-purpose tool.
