As Blizzard integrated its classic titles into the unified Battle.net platform, the security requirements evolved.
: Because there were only ten possibilities for the final digit, it was notoriously easy for users to "guess" a valid key. This led to the creation of famous dummy keys like 1234-56789-1234 . 2. Transition to Modern Standards As Blizzard integrated its classic titles into the
The original StarCraft CD key followed a predictable 13-digit pattern. As Blizzard integrated its classic titles into the
: To improve security and prevent duplication, physical boxes were eventually updated to use 26-digit keys. As Blizzard integrated its classic titles into the
: The first 12 digits could be virtually any combination; the final 13th digit served as a mathematical "check" to verify the preceding numbers.