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    Re-encrypting messages for distribution using a composition of ciphers
    4.
    发明专利
    Re-encrypting messages for distribution using a composition of ciphers 未知

    公开(公告)号：GB2473140A

    公开(公告)日：2011-03-02

    申请号：GB201014429

    申请日：2010-08-31

    Applicant: APPLE INC

    Inventor： FARRUGIA AUGUSTIN J ,  SULLIVAN NICHOLAS ,  FASOLI GIANPAOLO ,  CIET MATHIEU

    IPC: H04L29/06 ,  H04L9/08

    Abstract: A method and associated apparatus for use in a data distribution process to allow an untrusted intermediary 36 to re-encrypt a message received from an originator 30 for transmission to a message receiver 52, 56, 60. The invention uses a composition (combination) of two ciphers for re-encrypting the message at the intermediary without revealing the plain text message or either cipher to the intermediary. The originator encrypts the message with a substitution cipher process and the intermediary then re-encrypts it with a composition of an inverse of the substitution cipher process and a second cipher. The second cipher may also be a substitution cipher or it may be a keyed cipher. The receiver deciphers the second cipher to recover the original message. The message may be digital rights management (DRM) data such as a content key. There may be multiple intermediaries 64, 70 in a chained process.

    METHOD AND APPARATUS FOR KEY DISTRIBUTION WITH IMPLICIT OFFLINE AUTHORIZATION
    5.
    发明申请
    METHOD AND APPARATUS FOR KEY DISTRIBUTION WITH IMPLICIT OFFLINE AUTHORIZATION 审中-公开
    密钥分配的方法和装置，具有隐式离线授权

    公开(公告)号：WO2013002996A3

    公开(公告)日：2013-04-11

    申请号：PCT/US2012041407

    申请日：2012-06-07

    Applicant: APPLE INC ,  FARRUGIA AUGUSTIN J ,  FASOLI GIANPAOLO ,  SULLIVAN NICHOLAS

    Inventor： FARRUGIA AUGUSTIN J ,  FASOLI GIANPAOLO ,  SULLIVAN NICHOLAS

    IPC: H04L29/06

    CPC classification number: H04L63/0428 ,  H04L9/0827 ,  H04L9/083 ,  H04L9/088 ,  H04L63/10 ,  H04L2209/603

    Abstract: In a Digital Rights Management (DRM) system, cryptographic keys for decrypting distributed assets (such as audio or video media) are distributed using an offline (e.g., non-Internet) method for distribution of the key generation process, with an implicit authorization to use the distributed key generation process. This is used to update an asset key for use by a client such as a media player when a key formula for generating the key for decrypting an asset has been compromised, such as by hackers.

    Abstract translation: 在数字版权管理（DRM）系统中，用于解密分布式资产（例如音频或视频媒体）的加密密钥使用离散（例如，非因特网）方法来分发密钥生成过程，并且具有隐式授权 使用分布式密钥生成过程。 当用于生成用于解密资产的密钥的密钥的密钥公式（例如黑客）被破坏时，这用于更新资源密钥以供诸如媒体播放器之类的客户端使用。

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