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METHOD FOR TRANSMITTING ENCRYPTED DATA, USE OF SAME IN A PAY DIGITAL TELEVISION SYSTEM AND DECODER USED IN SAID SYSTEM
METHOD FOR TRANSMITTING ENCRYPTED DATA, USE OF SAME IN A PAY DIGITAL TELEVISION SYSTEM AND DECODER USED IN SAID SYSTEM
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机译：加密数据的传输方法，在付费数字电视系统中的使用方法以及在所述系统中使用的解码器
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摘要
The invention concerns a transmission method between a first module (25) and a second module (26) comprising the following steps: in the first module (25): calculating y such that y = g &cir& x mod (p), g and x being the random numbers preserved in the terminal, p being a prime number, g and p being known to the two modules; transmitting (38) the value y to the second module; in the second module (26): retrieving (32) the value y; generating (30) a random variable k; calculating (31) two values A and B, such that A = g &cir& k mod (p) B = y &cir& k.M mod (p), M being a known message to be transmitted in encrypted form; transmitting (34) values A and B to the first module (25); in the first module (25): retrieving (36) the message M using the following formula: M = B/(A &cir& x)mod (p).
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机译：本发明涉及在第一模块（25）和第二模块（26）之间的传输方法，该方法包括以下步骤：在第一模块（25）中：计算y，使得y ＝ g＆amp; x mod（p），g和x是终端中保留的随机数，p是素数，g和p是两个模块已知的;将值y发送（38）到第二模块;在第二模块（26）中：检索（32）值y;产生（30）随机变量k;计算（31）两个值A和B，使得A ＝ g＆amp; k mod（p）B ＝ y＆k.M mod（p），M是要以加密形式发送的已知消息;向第一模块（25）发送（34）值A和B;在第一模块（25）中：使用以下公式检索（36）消息M：M = B /（A＆cir＆x）mod（p）。
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