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Line 24: − + − The Download Play protocol broadcasts 3DS application data in the [[CIA]] format, which contains a certificate chain, a ticket, a TMD, and the actual application itself, in [[CXI|CXI format]]. The broadcasted archive data is temporarily stored as a file on the internal NAND Flash storage, and is kept there until new archive data from a different game is received through the Download Play protocol. + − The CXI application content is again encrypted, this time using 128-bit AES CBC. 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.+ + − So in actuality, the 3DS application code, as it is being transmitted wirelessly has been encrypted 3 times:+ − + − + − +
→Broadcasted application data: translate v0.5
引导Download Play可执行文件的wpa2通讯使用上述方法生成的随机十六进制字符串作为密码。
引导Download Play可执行文件的wpa2通讯使用上述方法生成的随机十六进制字符串作为密码。
== Broadcasted application data ==
== 广播应用数据 ==
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.
的使用加密解密titlekey的票，的TitleID用零填充的IV。 为了得到解密titlekey，titlekey存储在机票必须使用128位AES-CBC的3DS公用密钥解密，和相同的IV正如前面提到的。
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：
* The first time is using 128-bit AES CTR encryption for the ExeFS of the CXI format,
* 第一次使用128位AES CTR加密的CXI格式的ExeFS
* the second time is using 128-bit AES CBC encryption in the archive data,
* 第二次使用128位AES CBC加密的归档数据
* and the third time is using 128-bit AES CTR for the WPA2 encryption.
* 第三次使用128位AES的WPA2加密CTR。
== Remote Distribution of System-Updates ==
== Remote Distribution of System-Updates ==
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.