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    • 1. 发明申请
    • RING ARITHMETIC METHOD, SYSTEM, AND APPARATUS
    • 环算术方法,系统和设备
    • WO2002089399A1
    • 2002-11-07
    • PCT/US2002/013657
    • 2002-05-01
    • LAYER N NETWORKS, INC.MITCHELL, OscarDATTA, RajatSTEIN, KyleBLAKLEY, George
    • MITCHELL, OscarDATTA, RajatSTEIN, KyleBLAKLEY, George
    • H04L9/28
    • G06F7/72G01N2035/00247G01N2035/00574G06F7/723G06F7/727G06F7/728G06F13/1647G11C7/1066H04L9/302H04L47/125H04L63/0272H04L63/0428H04L63/166
    • A data encryption method performed with ring arithmetic operations using a residue number multiplication process wherein a first conversion to a first basis is done using a mixed radix system and a second conversion to a second basis is done using a mixed radix system. In some embodiments, a modulus C (96) is be chosen of the form 2 w - L, wherein C is a w-bit number and L is a low Hamming weight odd integer less than 2 (w-1)/2 . And in some of those embodiments, the residue mod C is calculated via several steps. P (98) is split into 2 w-bit words H 1 and L 1 (100). S 1 is calculated as equal to L 1 + (H 1 2 x1 ) + (H 1 2 x2 ) +...+ (H 1 2 xk ) + H 1 . S 1 is split into two w-bit words H 2 and L 2 . S 2 is computed as being equal to L 2 + (H 2 2 x1 ) + (H 2 2 x2 ) +...+ (H 2 2 xk ) + H 2 . S 3 is computed as being equal to S 2 + (2 x1 +...+ 2 xk + 1). And the residue is determined by comparing S 3 to 2 w . If S3 w , then the residue equals S 2 . If S 3 ≥ 2 w , then the residue equals S 3 - 2 w .
    • 利用残数乘法处理利用环算术运算执行的数据加密方法,其中使用混合基数系统完成到第一基础的第一转换,并且使用第二基础向第二基础转换到第二基础 混合基数系统。 在一些实施例中,模型C(96)被选择为形式2W-L,其中C是w位数并且L是小于2 (W-1)/ 2 。 并且在这些实施例中的一些中,通过多个步骤来计算残余mod C. P(98)被分成2个w位字H 1和L 1(100)。 S 1被计算为等于L 1 +1(H 1×2×1)+(H×1) 1×2×2)+ ... +(H 1×2×K)+ H 1×2 。 S 1被分成两个w位字H 2和L 2。 计算S 2 =等于L 2 +(H 2×2×1)+(H 2×2×2)+ ... +(H 2×2×k)+ H 2× >。 S 3被计算为等于S 2 +(2·x 1 + ... + 2·xk·+ 1)。 通过比较S 3到2 W来确定残余物。 如果S3 < 2 w,那么残基等于S 2。 如果S 3≥2W,那么残基等于S 3 -2 W