The present document specifies the structure of Secured Packets for different transport and security mechanisms. It is applicable to the exchange of secured packets between an entity in a network and an entity in the UICC. Secured Packets contain application messages to which certain mechanisms according to TS 102 224 [1] have been applied. Application messages are commands or data exchanged between an application resident in or behind the network and on the UICC. The Sending/Receiving Entity in the network and the UICC are responsible for applying the security mechanisms to the application messages and thus turning them into Secured Packets.