最新的2005版的03.48规范升级版,描述了电信GSM短信SMS结构和安全机制,简介如下: The present document specifies the structure of the Secured Packets in a general format and in implementations using Short Message Service Point to Point (SMS-PP) and Short Message Service Cell Broadcast (SMS-CB),The present document is applicable to the exchange of secured packets between an entity in a GSM PLMN and an entity in the SIM.Secured Packets contain application messages to which certain mechanisms