Share files and your clipboard safely on public Wi-Fi

What can happen on shared Wi-Fi

When you join a network you don't control, you share it with everyone else on it — and you can't see who they are. Common tricks:

• Watching traffic. On open or shared-password Wi-Fi, other people on the network can capture data that isn't protected.
• Fake hotspots. A network called “Cafe_Free_WiFi” may belong to the person at the next table, who then sits between you and everything you send.
• Tampering. Someone in the middle can try to swap a file or a pasted bank account number for one of their own.

AI makes this easier. Tools that once needed expertise are now automated: scanning a network for unprotected devices, building convincing fake login pages, and writing phishing messages that look exactly like the real thing. You can't count on spotting the attack — what you send has to be safe even when someone is watching.

How Linkeja protects you

• Everything is encrypted before it leaves your device. Clipboard items, file names and file contents are locked with AES-256 on your phone or computer and unlocked only on your other devices. Anyone on the network — or running the hotspot — sees scrambled data.
• Even the local shortcut is encrypted. When your devices are on the same Wi-Fi, files go straight between them for speed. That direct path is end-to-end encrypted too, so a shared network is never a weak spot.
• Tampering is detected. Every piece of a file is sealed so that any change, swap or reordering is noticed and rejected. You never end up with a file someone altered on the way.
• The keys never leave your devices. Not to the network, and not to our servers. Our servers only ever store and pass on locked data, so even someone who broke into them couldn't read it.
• A stolen password isn't enough. If an AI-written phishing message tricks someone into giving away their password, the attacker still can't read anything: every new device has to be approved on one you already use, after both show the same code.
• Share links carry their own key. When you send someone a link, the key travels inside it and is never sent to a server — and the link ends on its own after a set time or number of downloads.

Good habits that help

• Only approve devices you're holding. If Linkeja asks you to approve a device you don't recognise, deny it.
• Check the code. When you add a device, make sure both screens show the same 8-digit code.
• Keep your devices locked and up to date. Encryption protects what travels; it can't protect a device someone else has unlocked.
• Treat share links like the file itself. Send them only to the people they're for, and delete a link once it's been downloaded.

Want the technical detail? See exactly how Linkeja protects your data.