The words, explained.
Private messaging hides behind a wall of jargon. Here's the small set of terms CarrierPony actually uses, each in a sentence or two, with a fuller page behind it if you want the depth.
The cryptography 5
OpenPGP
The open standard CarrierPony uses to seal and sign everything.
End-to-end encryption
Sealed on your phone, opened only on theirs.
Ed25519
The signature algorithm on every envelope.
Curve25519
The curve behind the encryption key agreement.
Digital signature
Proof of who sent it, and that nothing changed.
Keys and trust 6
Public vs private key
The pair that makes all of this work.
Fingerprint
A key's short, uniquely identifying digest.
Safety number
Compare it once to rule out a man in the middle.
Trust on first use
Accept at first contact, alarm on any change.
Encrypted backup
The lifeboat for your keys if the phone is lost.
Passphrase
The long secret that seals your backup.
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Free private messaging and file transfer for iPhone. No accounts, no tracking, no phone numbers.