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    • 2. 发明授权
    • Key establishment method and system using commutative linear function
    • 关键建立方法和系统使用交换线性函数
    • US07715556B2
    • 2010-05-11
    • US11449405
    • 2006-06-08
    • Ku Young ChangDo Won HongHyun Sook ChoKyo Il Chung
    • Ku Young ChangDo Won HongHyun Sook ChoKyo Il Chung
    • G06F21/20
    • H04L9/0841
    • Provided are a key establishment method and system using commutative linear functions. In the method, a server defines a set of linear functions that use elements of a first finite field as coefficients and satisfy a commutative rule, selects a first linear function from the set, and selects a predetermined element from a second finite field. Next, the server selects a second linear function corresponding to each of nodes from the set, generates a predetermined combination function based on the first and second linear functions, generates a value of the second linear function using the selected element as a factor, and transmits the combination function and the value of the second linear function to a corresponding node. Each node receives the value of the second linear function from a server, exchanges the received values with the other nodes, computes a value using the exchanged value as a factor of the combination function, and establishes the computed value as a shared key between the nodes. Therefore, each node can perform key establishment with a small amount of computation and low memory consumption, while guaranteeing end-to-end security.
    • 提供了一种使用交换线性函数的关键建立方法和系统。 在该方法中,服务器定义一组线性函数,其使用第一有限域的元素作为系数并满足可交换规则,从集合中选择第一线性函数,并从第二有限域中选择预定元素。 接下来,服务器从集合中选择对应于每个节点的第二线性函数,基于第一和第二线性函数生成预定的组合函数,使用所选择的元素作为因子生成第二线性函数的值,并且发送 组合函数和第二个线性函数的值对应一个节点。 每个节点从服务器接收第二线性函数的值,与其他节点交换接收的值,使用交换的值作为组合函数的因子计算值,并将计算值建立为节点之间的共享密钥 。 因此,每个节点可以执行少量计算和低内存消耗的密钥建立,同时保证端到端的安全性。
    • 8. 发明授权
    • Apparatus for hybrid multiplier in GF(2m) and method thereof
    • GF(2m)中混合乘法器的装置及其方法
    • US07599979B2
    • 2009-10-06
    • US11046340
    • 2005-01-28
    • Yong Je ChoiKu Young ChangDo Won HongHyun Sook Cho
    • Yong Je ChoiKu Young ChangDo Won HongHyun Sook Cho
    • G06F7/72
    • G06F7/724
    • An apparatus and method for hybrid multiplication in GF(2m) by which trade-off between the area and the operation speed of an apparatus for a hybrid multiplier in finite field GF(2m) can be achieved are provided. The apparatus for hybrid multiplication includes: a matrix Z generation unit generating [m×k] matrix Z for performing a partial multiplication of a(x) and b(x), by dividing b(x) by k bits (k≦┌m/2┐), when multiplication of m-bit multiplier a(x) and m-bit multiplicand b(x) is performed from [(m+k−1)×k] coefficient matrix of a(x) in GF(2m); a partial multiplication unit performing the partial multiplication ┌m/k┐k−1 times in units of rows of the matrix Z to calculate an (┌m/k┐k−1)-th partial multiplication value and a final result value of the multiplication; and a reduction unit receiving the (┌m/k┐k−1)-th partial multiplication value fed back from the partial multiplication unit and performing reduction of the value in order to obtain a partial multiplication value next to the (┌m/k┐k−1)-th partial multiplication value.
    • 提供了一种用于在GF(2m)中的混合乘法的装置和方法,通过该方法可以实现有限域GF(2m)中用于混合乘法器的装置的区域和操作速度之间的权衡。 用于混合乘法的装置包括:通过将b(x)除以k位(k <=┌m/ m)来生成用于执行a(x)和b(x)的部分相乘的[mxk]矩阵Z的矩阵Z生成单元 在GF(2m)中的(x)的[(m + k-1)×k]系数矩阵中执行m比特乘法器a(x)和m比特被乘数b(x)的乘法时, 部分乘法单元以矩阵Z的行为单位执行部分乘法┌m/k┐k-1次,以计算(┌m/k┐k-1)个部分乘法值和最终结果值 乘法; 以及缩小单元,接收从部分乘法单元反馈的(┌m/k┐k-1)个部分相乘值,并执行该值的减少,以获得与(┌m/ k ┐k-1)部分乘法值。
    • 10. 发明授权
    • Method and apparatus for masking privacy area of image
    • 屏蔽图像隐私区域的方法和装置
    • US08666110B2
    • 2014-03-04
    • US12907562
    • 2010-10-19
    • Jang Hee YooGeon Woo KimJong Wook HanHyun Sook Cho
    • Jang Hee YooGeon Woo KimJong Wook HanHyun Sook Cho
    • G06K9/00
    • H04N7/18G06T1/00
    • Disclosed are a method and apparatus for masking a privacy area of an image. The method for masking a privacy area of an image includes: detecting a privacy area required to be protected in an image; and performing masking on the image. An important area (a face area of a person, a number plate area of a vehicle, a window area of a house, etc.) detected from an image inputted through a CCTV camera can be effectively and easily encrypted, scrambled, decoded, and descrambled. Also, the position of the important area detected before or after the important area is scrambled can be maintained to be consistent without having to use a metadata file. In addition, a scrambling algorithm of the same key value can be applicable regardless of the size of the important area. As a result, the system efficiency can be enhanced by effectively protecting personal information compared with a CCTV-based video security system.
    • 公开了一种用于屏蔽图像的隐私区域的方法和装置。 用于屏蔽图像的隐私区域的方法包括:检测图像中需要保护的隐私区域; 并对图像执行遮蔽。 从通过CCTV摄像机输入的图像检测到的重要区域(人的面部区域,车辆的车牌区域,房屋的窗户区域等)可以被有效且容易地加密,加扰,解码和 解扰了 此外,在重要区域之前或之后检测到的重要区域的位置被加扰可以保持一致,而不必使用元数据文件。 此外,无论重要区域的大小如何,都可以应用相同键值的加扰算法。 因此,与基于CCTV的视频安全系统相比,通过有效保护个人信息可以提高系统效率。