Gets the type of the public key used by the Encryptor Extension. This method returns a unique type identifier for the public key. It's important to ensure uniqueness when developing custom extensions.
The unique public key type identifier. In this implementation, it returns 'BL_ENCRYPTOR_EC'.
Note: If you're developing your own extension, make sure the returned type identifier is unique to your implementation. This ensures no conflicts arise with other extensions.
