We made private messaging easy.

Cyphr is a free, easy-to-use, encrypted messaging app for Android and iOS. All messages are encrypted, private and 100% yours. Create a free account, generate your public and private key pair, and start messaging.

Cyphr for iOS Cyphr for Android
Desktop and Web apps coming soon!
Envelope Key

Only you can read your messages.

Cyphr is a zero-knowledge messaging app. This means we cannot read, decrypt or share your messages. Cyphr generates a unique public and private key pair so only you and your friend can read your conversation - not us, not your wireless provider and not 3rd parties.

Privacy by design.

All messaging apps require some metadata in order to work. We specifically designed our servers to store the minimal amount of data necessary and then delete that data after messages are successfully delivered.

We store (briefly) We do NOT store
  • Encrypted message "blobs" that we cannot decrypt
  • The recipient of the message
  • The time stamp when your message is received

Note: This data is deleted when your message is successfully received.

  • Who sent the message
  • Your phone contacts
  • Your geo-location data
  • Your IP address
  • Your device platform
  • Your app version
  • Your device ID
We store (briefly)
  • Encrypted message "blobs" that we cannot decrypt
  • The recipient of the message
  • The time stamp when your message is received

Note: This data is deleted when your message is successfully received.

We do NOT store
  • Who sent the message
  • Your phone contacts
  • Your geo-location data
  • Your IP address
  • Your device platform
  • Your app version
  • Your device ID

Multiple layers of security.

When you use an unencrypted messaging app or traditional SMS/MMS messaging, you are essentially putting your messages in a mailbox that anyone can access. When you use Cyphr, you gain multiple layers of security.

Imagine everyone has a mailbox that requires a public key for inserting mail and a private key for withdrawing mail.

  • Public Key Verification

    Public Key Verification

    Each time you send a message, Cyphr adds a "verification" stamp so your friend knows the message is from you and not an impostor.

  • Symmetric Key Encryption

    Symmetric Key Encryption

    Cyphr then inserts your message into a locked envelope so your message cannot be read by 3rd parties.

  • Public Key Encryption

    Public Key Encryption

    Finally Cyphr uses your friend's public key to deliver the envelope into your friend's mailbox.

  • Private Key Decryption

    Private Key Decryption

    Only your friend has the private key to the mailbox so only they can open it and unlock your message.

Encryption Technology Benefits

  • 256-bit AES Symmetric Key Encryption

    Single use symmetric keys ensure messages are delivered securely and efficiently

  • Public & Private Encryption Key Pairings

    Ensures only the intended recipient can read your messages

  • Public-Key Verification

    Prevents someone from masquerading as someone else and sending false messages

  • SSL/TLS For Message Delivery

    Allows us to encrypt your message's metadata, in addition to the content

Read our full technical brief about how Cyphr works

Privacy Dial
  • Casual User
  • Privacy Fanatic

Be as private as you want to be.

Whether you are a casual user or a privacy fanatic, Cyphr allows you adjust the privacy settings that fit your needs. You are in control of your personal information and can enable or disable features that require it.

Your messages. Our servers. No 3rd parties.

Most other companies advertising "secure" messaging apps rely on 3rd party servers to store and transmit your messages. If a company does not own its servers, its privacy guarantees are only as good as the 3rd parties it relies on.

At Golden Frog we own our servers, write our code, and manage our own network so we can deliver on our privacy promises and offer our users the highest levels of security and speed. Our servers are based in Switzerland for maximum user privacy and protection.

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A company you can trust.

Golden Frog's founders are Internet veterans who have fought to preserve online privacy, security and freedom since 1994. We arm users in 195+ countries with VyprVPN, a secure personal VPN, Dump Truck, a secure online storage solution, and Cyphr, a secure encrypted messaging app. Together these tools allow users to protect themselves online, wherever they go.

Secure more than just your messages.

Vote for the features you want.

Features coming soon:

  • Multi-device support
  • Even bigger attachments
  • Rotation of encryption keys
  • Desktop apps
  • Whatever else you want!