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Download Play协议以[[CIA]] 格式广播3DS应用数据, 包含certificate chain, ticket, TMD各一,以及[[CXI|CXI format]]格式封装的应用本体。广播的归档数据临时存储在内部的NAND Flash直至其他游戏通过Download Play协议占用此空间。
Download Play协议以[[CIA]] 格式广播3DS应用数据, 包含certificate chain, ticket, TMD各一,以及[[CXI|CXI format]]格式封装的应用本体。广播的归档数据临时存储在内部的NAND Flash直至其他游戏通过Download Play协议占用此空间。
CXI 应用数据使用了128-bit AES CBC加密. The encryption uses the decrypted titlekey of the ticket, and the titleid padded with zeros as the IV. To get the decrypted titlekey, the titlekey stored in the ticket must be decrypted using 128-bit AES-CBC with the 3DS common key, and the same IV as mentioned previously.
CXI 应用数据使用了128-bit AES CBC加密. ticket中有加密的titlekey , 和titleID补零构成的IV。为了得到解密的titlekey,ticket中存储的titlekey必须使用128位AES-CBC的3DS公钥解密，以及前面提到的IV。
所以，事实上通过无线传输的3DS的应用程序，经过了3次加密：
所以，事实上通过无线传输的3DS的应用程序，经过了3次加密：
* 第三次使用128位AES的WPA2加密CTR。
* 第三次使用128位AES的WPA2加密CTR。
== Remote Distribution of System-Updates ==
== 远程分布式系统更新 ==
As part of the child distribution process, a 3DS acting as the server in a local Download Play session, can send firmware updates to another 3DS unit acting as the client, through first sending the system update package then instructing the client to install reboot and reinstantiate a connection (which it caches information about temporarily) remotely, if it finds system updates are necessary before distributing the child-application. ( eg. multiplayer game or a demo. ) Like "update" partitions on CTR Cards, this is not an "automatic feature" and not implemented for all Download Play titles.
As part of the child distribution process, a 3DS acting as the server in a local Download Play session, can send firmware updates to another 3DS unit acting as the client, through first sending the system update package then instructing the client to install reboot and reinstantiate a connection (which it caches information about temporarily) remotely, if it finds system updates are necessary before distributing the child-application. ( eg. multiplayer game or a demo. ) Like "update" partitions on CTR Cards, this is not an "automatic feature" and not implemented for all Download Play titles.