点按 新增标签，建立新的标签名称与新增成员，或于新增成员中，将朋友加入已设定的标签内。 [105] The Specter of this attack may be mitigated by enabling Sign's Registration Lock element, a kind of two-aspect authentication that needs the consumer to enter a PIN to register the contact number on a whole new unit.[146] Some of the organizers have moved to encrypted messaging apps https://www.lt-signal.com/