Establishing a trusted login procedure

When a user logs into a first online service, that service creates a unique identifier for the user's device. This identifier is then linked to the user's login status for the first service. Both the device identifier and the login status are then shared with a second online service that trusts the first, allowing for a seamless, trusted login experience. The device identifier is specifically generated from information like the device's IP address, MAC address, SIM card, or UICC number, and can be calculated using an MD5 algorithm.

Why it matters: Since 2020, privacy regulations have tightened, and MD5 has been further deprecated for security, making the specific device identification methods claimed an obstacle. Rebuilding would require updating these core components with modern privacy-preserving techniques.

Status: Not in forceListed as no longer active. The specific reason is not in the record we hold.
How hard to build: SpecializedSoftware logic, server communication, security protocols

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