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    • 5. 发明授权
    • Smart cards having protection circuits therein that inhibit power analysis attacks and methods of operating same
    • 其中具有抑制功率分析攻击的保护电路的智能卡及其操作方法
    • US07620823B2
    • 2009-11-17
    • US10429084
    • 2003-05-02
    • Seo-Kyu Kim
    • Seo-Kyu Kim
    • H04L9/32
    • G06K19/073G06K19/07363
    • A smart card includes an integrated circuit device having secure information therein. A protection circuit is provided within the smart card. This protection circuit is configured to protect the integrated circuit device, by preventing unauthorized retrieval of the secure information using a power analysis technique. This is done by maintaining at least one power supply line that is electrically coupled to the integrated circuit device at a substantially uniform voltage when the integrated circuit device is active. This uniform voltage operates to mask the operations performed by the integrated circuit device, and thereby conceal these operations from external hardware that may be designed to support the power analysis technique. In particular, a variable capacitor is provided to supply displacement current to the power supply line and the integrated circuit while the capacitance of the capacitor is gradually decreased at an appropriate rate to support a constant supply voltage on the power supply line.
    • 智能卡包括其中具有安全信息的集成电路装置。 在智能卡内提供保护电路。 该保护电路被配置为通过使用功率分析技术防止未经授权地检索安全信息来保护集成电路设备。 这是通过在集成电路器件处于活动状态时保持以基本均匀的电压电耦合到集成电路器件的至少一个电源线来完成的。 该均匀电压用于屏蔽由集成电路器件执行的操作,从而将这些操作从可被设计为支持功率分析技术的外部硬件中隐藏起来。 特别地,提供可变电容器以在电容器的电容以适当的速率逐渐减小时向电源线和集成电路提供位移电流,以支持电源线上的恒定电源电压。
    • 7. 发明授权
    • Color error diffusion
    • 颜色错误扩散
    • US5375002A
    • 1994-12-20
    • US157270
    • 1993-11-26
    • Seo-Kyu KimYoon-Soo Kim
    • Seo-Kyu KimYoon-Soo Kim
    • B41J2/525H04N1/034H04N1/52H04N1/40H04N1/46
    • H04N1/52
    • An error diffusion circuit and method for adoptively compensating for the distortion of brightness and color with respect to neighboring pixels. An error diffusion circuit of a color image printer having a circuit for scanning color documents and generating C-M-Y (cyan-magenta-yellow) signals from an input pixel includes a color determining portion for adding the C-M-Y signals to a diffusion error to generate a current pixel value, comparing the current pixel value with sequentially supplied error look-up data to determine an address of error look-up data having the smallest error as output pixel color information, and applying the output pixel color information to the printer; an error storage portion for storing the smallest error out of errors calculated from the color determining portion as an error for a current pixel, reading out the stored error when a next pixel is processed, and providing the read error as neighboring pixel error information to the color determining portion so as to generate the diffusion error; a neighboring pixel color information storage portion for storing the output pixel color information as neighboring pixel color information of the next pixel; and an error look-up table storage portion for storing error values generated when printing the input pixel according to the output pixel color information and providing the error values as the error look-up data to the color determining portion.
    • 一种误差扩散电路和方法,用于过度补偿亮度和颜色相对于相邻像素的失真。 具有用于扫描彩色文档和从输入像素产生CMY(青色 - 品红色 - 黄色)信号的电路的彩色图像打印机的误差扩散电路包括用于将CMY信号加到扩散误差的颜色确定部分,以产生当前像素 将当前像素值与顺序提供的错误查找数据进行比较,以确定具有最小误差的错误查找数据的地址作为输出像素颜色信息,以及将输出像素颜色信息应用于打印机; 用于存储从颜色确定部分计算的错误中的最小误差作为当前像素的误差的误差存储部分,当处理下一个像素时读出存储的误差,并将读取的误差作为相邻像素误差信息提供给 颜色确定部分以产生扩散误差; 相邻像素颜色信息存储部分,用于存储输出像素颜色信息作为下一个像素的相邻像素颜色信息; 以及错误查找表存储部分,用于存储根据输出像素颜色信息打印输入像素时产生的错误值,并将错误值作为错误查找数据提供给颜色确定部分。
    • 8. 发明申请
    • System and recording medium for securing data and methods thereof
    • 用于保护数据的系统和记录介质及其方法
    • US20060029224A1
    • 2006-02-09
    • US11197316
    • 2005-08-05
    • Yoo-Jin BaekSang-geun OhSeo-kyu Kim
    • Yoo-Jin BaekSang-geun OhSeo-kyu Kim
    • H04L9/30
    • H04L9/004H04L9/302H04L9/3249H04L2209/04
    • A system and recording medium for securing data and methods thereof including a modular exponentiation. One embodiment includes first masking a message, second masking an exponent, and executing a modular exponentiation based at least one of the first and second maskings. Another embodiment includes first masking a message, second masking at least one exponent, executing a modular exponentiation based at least one of the first and second maskings, detecting an error, executing a modular multiplication operation based on the detection and diffusing the detected error to generate an electronic signature. Yet another embodiment includes first masking a message, second masking at least one exponent, executing a modular exponentiation based at least one of the first and second maskings, detecting an error, and generating an electronic signature based on the detected error.
    • 一种用于保护数据的系统和记录介质及其方法,包括模幂运算。 一个实施例包括首先掩蔽消息,第二掩蔽指数,以及基于第一和第二掩码中的至少一个执行模幂运算。 另一个实施例包括首先掩蔽消息,第二掩蔽至少一个指数,基于第一和第二掩码中的至少一个执行模幂运算,检测错误,基于检测执行模乘法运算并扩展检测到的错误以产生 电子签名。 另一个实施例包括首先掩蔽消息,第二掩蔽至少一个指数,基于第一和第二掩蔽中的至少一个执行模幂运算,检测错误,以及基于检测到的错误生成电子签名。
    • 9. 发明授权
    • Video format converting apparatus
    • 视频格式转换装置
    • US06342923B1
    • 2002-01-29
    • US09220578
    • 1998-12-23
    • Seo-Kyu Kim
    • Seo-Kyu Kim
    • H04N701
    • H04N7/0135
    • A system which can perform video communications via terminals which can send and receive video and audio signals should convert a video signal format set in each terminal into a common intermediate format (CIF) to then perform encoding and decoding operations. A video format converting apparatus can reduce the size of line memories which are used for video format conversion during converting an image picked up by a charge coupled device (CCD) camera into a CIF image. Thus, the number of line memories used for video format conversion of images can be reduced, thereby providing an effect capable of reducing the size of an integrated circuit of the line memories. The video format converting apparatus can be also applied to convert an NTSC signal as well as the CCD image into the CIF image.
    • 可以通过可以发送和接收视频和音频信号的终端执行视频通信的系统应该将设置在每个终端中的视频信号格式转换成公共中间格式(CIF),然后执行编码和解码操作。 在将由电荷耦合器件(CCD)照相机拾取的图像转换成CIF图像时,视频格式转换装置可以减小用于视频格式转换的行存储器的大小。 因此,可以减少用于图像的视频格式转换的行存储器的数量,从而提供能够减小行存储器的集成电路的尺寸的效果。 视频格式转换装置也可以应用于将NTSC信号以及CCD图像转换成CIF图像。