The disclosed technology relates to securely sharing data between a hearing care professional (HCP) and a hearing device user. For example, the disclosed technology relates to securely accessing fitting data for a hearing device. The disclosed technology includes a hearing device that has a memory, where the memory stores a key that can be used for encryption and decryption. The key can be a symmetrical key. In addition to storing a key, the hearing device can store a uniform resource indicator (URI) in its memory.