Elliptic curve point multiplication
    54.
    发明授权
    Elliptic curve point multiplication 有权
    椭圆曲线点乘法

    公开(公告)号:US07602907B2

    公开(公告)日:2009-10-13

    申请号:US11173251

    申请日:2005-07-01

    IPC分类号: H04K1/00 H04K3/00

    摘要: Systems and methods configured for recoding an odd integer and elliptic curve point multiplication are disclosed, having general utility and also specific application to elliptic curve point multiplication and cryptosystems. In one implementation, the recoding is performed by converting an odd integer k into a binary representation. The binary representation could be, for example, coefficients for powers of two representing the odd integer. The binary representation is then configured as comb bit-columns, wherein every bit-column is a signed odd integer. Another implementation applies this recoding method and discloses a variation of comb methods that computes elliptic curve point multiplication more efficiently and with less saved points than known comb methods. The disclosed point multiplication methods are then modified to be Simple Power Analysis (SPA)-resistant.

    摘要翻译: 公开了用于重新编码奇整数和椭圆曲线点乘法的系统和方法,其具有一般实用性,并且还具体应用于椭圆曲线点乘法和密码系统。 在一个实现中,通过将奇数整数k转换成二进制表示来执行重新编码。 二进制表示可以是例如表示奇整数的两个幂的系数。 然后将二进制表示配置为梳状位列,其中每个位列是带符号的奇整数。 另一种实现方式应用这种重新编码方法,并且公开了一种梳理方法的变体,它们比已知的梳理方法更有效地计算椭圆曲线点乘积并且具有较少的保存点。 然后将所公开的点乘法方法修改为抗电阻简单功率分析(SPA)。

    Digital watermarking of tonal and non-tonal components of media signals
    55.
    发明授权
    Digital watermarking of tonal and non-tonal components of media signals 有权
    媒体信号的音调和非音调分量的数字水印

    公开(公告)号:US07454034B2

    公开(公告)日:2008-11-18

    申请号:US10869178

    申请日:2004-06-15

    IPC分类号: G06K9/00

    摘要: A digital watermarking method performs tonal detection on a signal (e.g., audio) to identify tonal and non-tonal components. These components are analyzed to compute appropriate weighting of a digital watermark for the tonal and non-tonal components. This tonal detection method is also used in recovering the watermark. A decoding method performs tonal detection on a watermarked signal, computes weights for tonal and non-tonal components, and recovers the embedded watermark using the weights. The same or different watermark embedding schemes may be used to embed digital watermarks in the tonal and non-tonal components. Tonal analysis is used in conjunction with frequency and temporal shaping to adapt the digital watermark to the signal in which it is embedded.

    摘要翻译: 数字水印方法对信号(例如,音频)执行色调检测以识别色调和非音调分量。 分析这些组件以计算用于色调和非音调分量的数字水印的适当加权。 这种色调检测方法也用于恢复水印。 解码方法对水印信号执行色调检测,计算色调和非色调分量的权重,并使用权重恢复嵌入的水印。 可以使用相同或不同的水印嵌入方案来将音频和非音调分量中的数字水印嵌入。 音调分析与频率和时间整形一起使用,以使数字水印适应其嵌入的信号。

    Distributed single sign-on service
    57.
    发明申请
    Distributed single sign-on service 有权
    分布式单点登录服务

    公开(公告)号:US20070044143A1

    公开(公告)日:2007-02-22

    申请号:US11208509

    申请日:2005-08-22

    IPC分类号: G06F17/30

    摘要: The described implementations relate to establishing authenticated communication between a client computing device and a service provider. In one implementation, once a registration procedure is complete, multiple authentication servers are used by a client computing device and a service provider to facilitate the establishment of an authenticated communication session. However, the authentication servers are not necessarily trusted authorities. That is, secrets of the various described devices are not revealed to each other.

    摘要翻译: 所描述的实现涉及在客户端计算设备和服务提供商之间建立认证通信。 在一个实现中,一旦注册过程完成,则客户端计算设备和服务提供商使用多个认证服务器来促进认证通信会话的建立。 然而,认证服务器不一定是受信任的权限。 也就是说,各种描述的装置的秘密不会彼此泄露。

    JPEG2000 SYNTAX-COMPLIANT ENCRYPTION WITH FULL SCALABILITY
    58.
    发明申请
    JPEG2000 SYNTAX-COMPLIANT ENCRYPTION WITH FULL SCALABILITY 有权
    JPEG2000具有完整的可扩展性的合成加密

    公开(公告)号:US20060265601A1

    公开(公告)日:2006-11-23

    申请号:US11419468

    申请日:2006-05-19

    IPC分类号: H04K1/00

    CPC分类号: H04K1/00 H04L9/0637

    摘要: A method and system is provided for encrypting an image compressed with a JPEG2000-based compression with minimal overhead so that the encrypted codestream is compliant with the syntax of the JPEG2000-based compression and can be scaled without decrypting. The encryption system generates, for each independent encryption segment of a codestream for an image, a unique initialization vector from a global initialization vector in such a way that the initialization vectors can be generated during decryption from the global initialization vector, even after truncation. The encryption system encrypts each independent encryption segment using its unique initialization vector. The encryption system ensures that the encrypted codestream is compliant with the syntax of the JPEG2000-based compression both as originally generated and as truncated by an encryption-unaware device.

    摘要翻译: 提供了一种方法和系统,用于以最小的开销加密用基于JPEG2000的压缩压缩的图像,使得加密的码流符合基于JPEG2000的压缩的语法,并且可以在不进行解密的情况下进行缩放。 加密系统对于图像的码流的每个独立加密段产生来自全局初始化向量的唯一初始化向量,使得即使在截断之后也可以在全局初始化向量的解密期间生成初始化向量。 加密系统使用其唯一的初始化向量来加密每个独立的加密段。 加密系统确保加密的码流符合基于JPEG2000的压缩的语法,原始生成并被加密不知情的设备截断。

    Ciphertext switching for syntax compliant encryption
    59.
    发明申请
    Ciphertext switching for syntax compliant encryption 有权
    用于符合语法的加密的密文切换

    公开(公告)号:US20060210081A1

    公开(公告)日:2006-09-21

    申请号:US11081279

    申请日:2005-03-16

    IPC分类号: H04L9/00

    摘要: Systems and methods providing ciphertext switching for syntax compliant encryption are described. In one aspect, intermediate ciphertext is generated from syntax compliant plaintext. Post-processing is applied to the intermediate ciphertext to determine if there are any illegal symbols in the intermediate ciphertext. If an illegal symbol is located, the illegal symbol in the intermediate ciphertext is switched with a corresponding plaintext symbol. One or more iterations of the post-processing and switching operations result in syntax compliant ciphertext.

    摘要翻译: 描述了为符合语法的加密提供密文切换的系统和方法。 在一个方面,从语法兼容的明文生成中间密文。 后处理应用于中间密文以确定中间密文中是否存在任何非法符号。 如果存在非法符号,则用相应的明文符号切换中间密文中的非法符号。 后处理和切换操作的一个或多个迭代导致符合语法的密文。

    Transactional watermarking
    60.
    发明授权
    Transactional watermarking 失效
    事务水印

    公开(公告)号:US06915481B1

    公开(公告)日:2005-07-05

    申请号:US09481758

    申请日:2000-01-11

    IPC分类号: G06F15/00 G06T1/00

    CPC分类号: G06T1/0071 G06Q10/025

    摘要: Transactional watermarking is disclosed. In one embodiment, a computer-implemented method includes receiving an original multimedia content source. The original multimedia content source may have already had a watermark added thereto. The method watermarks at least a portion of the source at least two times, each time with a different watermark to generate a different watermarked version of the original multimedia content source. A final watermarked content source is then generated by utilizing the different watermarked versions of the content source. One particular version of the watermarked content source may be selected as the final watermarked content source; at least a portion of at least two of the different watermarked versions of the watermarked content source may be combined to generate the final watermarked content source; etc.

    摘要翻译: 披露事务水印。 在一个实施例中,计算机实现的方法包括接收原始多媒体内容源。 原始多媒体内容源可能已经添加了水印。 该方法至少将源的一部分水印至少两次,每次都使用不同的水印来生成原始多媒体内容源的不同水印版本。 然后通过利用内容源的不同水印版本来生成最终的加水印内容源。 可以选择水印内容源的一个特定版本作为最终加密的内容源; 可以组合水印内容源的不同水印版本中的至少两个的至少两个的至少一部分,以生成最终加密的内容源; 等等