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    • 4. 发明授权
    • Pay broadcasting system with enhanced security against illegal access to a down loaded program in a subscriber terminal
    • 付费广播系统具有增强的安全性,防止非法访问订户终端中的下载节目
    • US06714649B1
    • 2004-03-30
    • US09345829
    • 1999-07-01
    • Isao MasudaYoshimasa GotoTakenosuke HaradaKazuhiro MachidaMitsuteru Kataoka
    • Isao MasudaYoshimasa GotoTakenosuke HaradaKazuhiro MachidaMitsuteru Kataoka
    • H04L944
    • H04H60/23H04H60/15H04N5/913H04N7/1675H04N21/2347H04N21/4334H04N21/4405H04N21/63345H04N2005/91364
    • In a pay broadcasting system, data of a broadcast program is scrambled with a scramble key updated in a short period. The scramble key is encrypted with a first key assigned to the subscriber terminal. The first key is encrypted with a first master key set in the subscriber terminal. The security of a broadcast program stored for subsequent use in the subscriber terminal is enhanced as follows. A central station generates a second key-encrypted scramble key by encrypting the scramble key with a second key different from the first key and changeable in an interval shorter than a update interval of the first key; generates an encrypted second key by encrypting the second key with a second master key which has been commonly issued to subscriber terminals of the system; and broadcast the second key-encrypted scramble key and the encrypted second key together with the scrambled data of the program, the first key-encrypted scramble key and the encrypted first key in a multiplexed manner. When a broadcast program is to be stored, the subscriber terminal stores the scrambled data of the broadcast program and the second key-encrypted scramble key; decrypt the encrypted second key with the second master key into the second key, which is added to a stored program second key list. If the stored program is to be executed, the second key-encrypted scramble key is decrypted with a corresponding one of the second keys in the stored program second key list into a decrypted scramble key; and the scrambled data of the broadcast program is unscrambled with the decrypted scramble key.
    • 在付费广播系统中,广播节目的数据用短时间更新的加扰密钥加扰。 加密密钥用分配给用户终端的第一密钥加密。 第一密钥是用在用户终端中设置的第一主密钥进行加密的。 存储用于用户终端中的后续使用的广播节目的安全性如下增强。 中央站通过用不同于第一密钥的第二密钥加密加密密钥并且以比第一密钥的更新间隔短的间隔进行加密来生成第二密钥加密的加密密钥; 通过用通常发给系统的用户终端的第二主密钥加密第二密钥来生成加密的第二密钥; 并且以多路复用的方式与节目的加密数据,第一密钥加密的加扰密钥和加密的第一密钥一起广播第二密钥加密的加密密钥和加密的第二密钥。 当要存储广播节目时,用户终端存储广播节目的加密数据和第二密钥加密的加扰密钥; 将具有第二主密钥的加密的第二密钥解密为第二密钥,其被添加到存储的程序第二密钥列表。 如果要执行存储的程序,则将第二密钥加密的加密密钥与存储的程序第二密钥列表中的第二密钥中的相应的一个密钥解密成解密的加密密钥; 并且利用解密的加扰密钥对广播节目的加密数据进行解扰。