公开(公告)号：US20070113084A1

公开(公告)日：2007-05-17

申请号：US11459804

申请日：2006-07-25

申请人： Atsumu SODA

发明人： Atsumu SODA

IPC分类号： H04L9/00

CPC分类号： H04L9/0891

摘要： An information processing apparatus decrypts, using meta data, encrypted data obtained by encrypting stream data including successive frames according to an encryption method in which, when the stream data is sequentially encrypted on a frame-by-frame basis, a key used for encrypting each frame is updated according to a predetermined rule. The meta data includes the plurality of keys used for encrypting the stream data and update information for identifying update timings of the keys. The apparatus includes a decrypter for acquiring the encrypted data and decrypting each frame using the key used for encrypting the frame and a meta data acquirer for acquiring the meta data and delivering one of the keys corresponding to the frame to the decrypter in accordance with the update information. The meta data acquirer includes a corrector for detecting an error in the update information and correcting the update information if an error has occurred.

摘要翻译： 信息处理装置使用元数据解密通过根据加密方法加密包含连续帧的流数据而获得的加密数据，其中当流数据逐帧依次加密时，用于加密每个 帧根据预定规则被更新。 元数据包括用于加密流数据的多个密钥和用于识别密钥的更新定时的更新信息。 该装置包括用于获取加密数据并使用用于加密帧的密钥解密每个帧的解密器，以及用于获取元数据的元数据获取器，并且根据该更新将与帧对应的一个密钥递送给解密器 信息。 元数据获取器包括用于检测更新信息中的错误并且如果发生错误则校正更新信息的校正器。