# NETTRASH.Exchange — End-to-end via any messenger > End-to-end via any messenger (iPhone/iPad app by Ivan Alekseev.) - Source: https://appshunter.io/ios/app/nettrashexchange/id6766308999 (this page in markdown: same URL + `.md`) - Developer: [Ivan Alekseev](https://appshunter.io/developer/1810476242) - Category: Utilities, Lifestyle - Price: Free - Age rating: 4+ - Requires: iOS 26.0 · 2 MB - Languages: English - Released: 2026-05-06 - Data updated: 2026-07-07 - User reviews in markdown: https://appshunter.io/ios/app/nettrashexchange/id6766308999/reviews.md ## What is NETTRASH.Exchange? Exchange is a cryptographic messenger that puts you in charge of your keys. Type your message in Exchange, encrypt it to a recipient whose public key you have saved, and you get a single line of encrypted text — an EXC2 envelope. Send it through any app you already use: iMessage, Mail, Telegram, WhatsApp, anything that can carry text. The recipient opens it back in Exchange and reads the original message. Nobody else can. Or use the built-in iMessage extension. Tap Exchange in the iMessage app drawer, pick a contact, type, encrypt, send. A locked-message bubble drops into the conversation. The recipient taps it and Exchange opens straight to the decrypted plaintext — no copy-paste, no app switching. NEW IN 1.1 Native Mac support. Exchange now runs as a Mac Catalyst app on Apple silicon and Intel Macs, sharing the same recipient list and decrypt flow as the iPhone version. Decrypt on tap from Messages. Tap a locked-message bubble in iMessage on iPhone or Mac and Exchange opens directly to the plaintext via Universal Links — no copy-paste. Rich link previews. Encrypted messages sent from the Compose flow now appear as preview bubbles in iMessage, Telegram, Slack, and other messengers, with the Exchange icon and an "Install Exchange" page for recipients without the app. Identity sync. By default, your private key is carried across the devices signed into your Apple ID via iCloud Keychain — which is itself end-to-end encrypted with a device-class secret. Toggle off in Settings if you prefer the original device-only behaviour. Recipients sync. Your saved recipient list is also kept in sync across your devices, encrypted on-device with a key derived from your identity. Apple sees only opaque ciphertext — display names, public keys, and notes stay end-to-end encrypted between your devices. Backup and transfer. In Settings, export your identity as a passphrase-encrypted blob you can save in a password manager, or transfer it in person to another of your devices via a single-use QR code. EVERYTHING ON YOUR DEVICE Exchange has no servers. No backend, no accounts, no telemetry, no analytics, no tracking. The cryptographic operations all run locally using Apple's CryptoKit framework. The only data that ever leaves your device is what you explicitly choose to send — and even then, only the encrypted envelope. PROVEN ALGORITHMS Exchange uses standard, publicly-vetted cryptography: - Curve25519 (X25519) key agreement - Ed25519 signatures for sender authentication - ChaCha20-Poly1305 authenticated encryption - HKDF-SHA256 for key derivation - PBKDF2-HMAC-SHA256 for passphrase backup Every message is signed by your identity and verified by the recipient before the plaintext is shown. Tampered envelopes are rejected, not silently corrupted. KEY EXCHANGE THAT MAKES SENSE Two people meet in person — at the office, at a cafe, at a conference. One taps "Show QR code" in Exchange, the other taps "Scan QR" from Add Recipient. A few seconds and they've exchanged the public-key bundle, including a fingerprint they can verify out loud. From then on, no matter what messenger they use to talk, only they can read what they send. WHAT EXCHANGE IS NOT Exchange isn't a chat app. It doesn't have group chats, voice calls, or read receipts. It's a tool you use with whatever transport you prefer. It isn't a key recovery service. If you lose all your devices and don't have iCloud Keychain sync turned on, your identity is gone. There is no developer-side recovery, no master key, no back door. It isn't a server-trust system. There's no central directory of users. You decide who your contacts are, in person or through whatever channel you trust. REQUIREMENTS iOS 26 or later on iPhone and iPad. macOS 26 or later on Mac (Apple silicon or Intel) via Mac Catalyst. Camera optional, used for QR-code scanning. FREE AND OPEN Exchange is independent software that respects your time and your data. No ads, no subscriptions, no upsells. ## Version history (last 5 releases) ### 1.4 — 2026-07-06 Share any file to Exchange to encrypt or decrypt it. Exchange now appears in the Share sheet for any file, photo, link, or selected text — so you can seal or open something without leaving the app you're in. Share something to Exchange and it works out what to do: • If it's encrypted for you — a .exc2 file, an EXC2: envelope, or an exchange.nettrash.me link — Exchange opens Decrypt and restores the original file. • If it's anything else, Exchange opens Encrypt: pick a recipient and get back a sealed .exc2 to send through any app. Only they can open it, and they can verify it came from you. Exchange opens to finish the job, so your biometric App Lock still applies before anything is revealed. And if you share an Exchange identity backup or transfer by mistake, it's recognised and pointed to Settings → Import instead of being encrypted. Same encryption format as messages, so files interoperate across iPhone, iPad, Mac and Android. As always: no accounts, no servers, no telemetry, no ads. Your keys never leave your device. ### 1.3 — 2026-06-11 Exchange 1.3 brings end-to-end encryption to your files — not just your messages. • Encrypt & decrypt files. Seal any file — its name and its contents — to a recipient as a single .exc2, signed by you. They open it in Exchange (or tap the file, then choose Open in Exchange) and get the original back. It's the same envelope format as your messages, so it works across iPhone, Mac and Android. • App lock. Turn on an optional Face ID / Touch ID / Optic ID lock — with your device passcode as a fallback — to require unlocking before Exchange opens. Choose how soon it re-locks after going to the background, and whether the lock also covers shared message links and the iMessage app. Your keys stay protected by the system Keychain either way. • Decrypt shared message links. Paste — or tap — an exchange.nettrash.me message link and Exchange pulls out the envelope and decrypts it in place. The raw EXC2: text still works too. • Choose how you share a sealed message. The Compose result screen now has a Link / EXC2 toggle: hand off a rich link that shows a locked-padlock preview and opens Exchange to decrypt, or the raw EXC2 text for plain-text channels. Your choice is remembered. • Compose remembers your last recipient. Whoever you picked last is pre-selected next time — and the choice carries between the main app and the iMessage extension. Also in this release: • The Compose recipient picker now lists people in the same order as the home screen. • Fixed: the Encrypt & sign button is no longer hidden behind the keyboard while you type. As always: no accounts, no servers, no telemetry, no ads. ### 1.2 — 2026-06-05 Manage your recipient list. - Rename: tap a recipient (or right-click on Mac) to edit its display name and notes. The key identity behind it never changes. - Reorder: tap Edit and drag recipients into the order you want. - Your names and order sync across iPhone and Mac and are included in encrypted backups. ### 1.1 — 2026-05-09 Native Mac support, multi-device identity and recipients, decrypt on tap from Messages. - Native Mac. Exchange now runs as a Mac Catalyst app, sharing the recipient list and decrypt flow with the iPhone version. - Decrypt on tap. Tap an encrypted-message bubble in iMessage on iPhone or Mac and Exchange opens straight to the decrypted plaintext via Universal Links. No more copy-paste round trip. - Rich link previews. Encrypted messages sent from Compose now show up as preview bubbles in iMessage, Telegram and other messengers, with the Exchange icon — instead of a wall of base64. - Identity sync. By default, your private key is carried across the devices on your Apple ID via end-to-end-encrypted iCloud Keychain. Toggle off in Settings to keep it pinned to one device. - Recipients sync. Your saved recipient list is also kept in sync across your devices, encrypted on-device with a key derived from your identity. Apple sees only ciphertext. - Backup and transfer. Export your identity as a passphrase-encrypted blob to keep in a password manager, or transfer it in person to another of your devices via a single-use QR code. - Smoother launch from a tapped Messages link — the splash transitions straight to the decrypted message, with no home-screen flash in between. - Auto-detects encrypted envelopes already on your clipboard when you open Decrypt. ### 1.0 — 2026-05-07 No release notes. ## More apps by Ivan Alekseev - [NETTRASH.Scan](https://appshunter.io/ios/app/nettrashscan/id6763932723) - [NETTRASH.md](https://appshunter.io/ios/app/nettrashmd/id6785397346) All apps by Ivan Alekseev: https://appshunter.io/developer/1810476242 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-07.*