Arc Technologies

CrossLink - v0.1 update!

Added 2025-08-26 13:03:45 +0000 UTC

For those of you don't know, CrossLink is a background service which enables context aware inter-connectivity across NEX apps on different platforms and operating systems. This is the first release after the initial MVP with many new bug fixes and stronger security.

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Better security

In its MVP stage, CrossLink used an ephemeral RSA–AES hybrid for each connection. With the v0.1 release, security has been taken a step further: every device now generates its own permanent RSA key pair. These keys are used to sign and verify requests, ensuring that each connection truly comes from the right source.

This is especially important for advanced features like Theme Sync. Every theme change request is now verified through signature checks handled by CrossLink, adding a strong layer of trust and protection.

New Public IDs

The old 4-digit Public IDs have been replaced with 8-character IDs, providing more combinations and reducing the chances of identity clashes. Any duplicate IDs are now handled safely thanks to signature verification using the permanent public key of the connected device. If a verification fails, the connection is immediately terminated, ensuring security and integrity.

A security dialog appears inside CrossLink when the user tries to delete a saved identity (device).

CrossLink Service

Evolve now enables a CrossLink Service which runs continuously in the background, enabling users to receive or send files even when CrossLink GUI is not running.

CrossLink (the puppy) carrying your files (the stick)

A permission dialog appearing from CrossLink Service trying to receive a file.

CrossLink Bridge

CrossLink Bridge is the UI for CrossLink Service. It is an external package which can be imported into NEX Apps, enabling that app to connect and communicate with CrossLink Service running on the device.

More details on B187 of Evolve.