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热词
    • 17. 发明授权
    • Method and apparatus for producing a message authentication code in a
cipher block chaining operation by using linear combinations of an
encryption key
    • 通过使用加密密钥的线性组合在密码块链接操作中产生消息认证码的方法和装置
    • US6128737A
    • 2000-10-03
    • US62837
    • 1998-04-20
    • Mariusz H. JakubowskiRamarathnam Venkatesan
    • Mariusz H. JakubowskiRamarathnam Venkatesan
    • H04L9/32H04L9/08
    • H04L9/0643H04L9/0637H04L9/3242H04L2209/56
    • A cryptographic technique that not only provides fast and extremely secure encryption and decryption but also assures integrity of a ciphertext message. This technique involves, during message encryption: generating, in response to an incoming plaintext message, an intermediate stream--such as by chaining the message, wherein a predefined portion of the intermediate stream defines a message authentication code (MAC); inserting an encrypted version of the MAC into a predefined portion of a ciphertext message; and generating, in response to the intermediate stream and the encrypted MAC, a remainder of the ciphertext message such that the remainder exhibits a predefined variation, e.g., a pseudo-random sequence, also contained within the encrypted MAC. Decryption proceeds in essentially a reverse fashion. By extending the sequence across the remainder of the ciphertext, any subsequent change to the ciphertext would likely destroy the continuity of the sequence otherwise residing throughout the remainder of the ciphertext. During decryption, any violation to the integrity of the ciphertext can be readily detected by decrypting the MAC contained in the ciphertext and comparing it, for any discrepancies, against a MAC generated from recovered plaintext.
    • 一种加密技术,不仅提供快速和极其安全的加密和解密,而且确保密文消息的完整性。 该技术涉及在消息加密过程中:响应于传入的明文消息,生成中间流(例如通过链接消息),其中中间流的预定义部分定义消息认证码(MAC); 将所述MAC的加密版本插入密文消息的预定义部分; 以及响应于所述中间流和加密的MAC生成所述密文消息的其余部分,使得所述余数呈现还包含在所述加密MAC内的预定义变化,例如伪随机序列。 解密以基本上相反的方式进行。 通过将序列扩展到密文的其余部分,对密文的任何后续更改都可能破坏序列的连续性,否则它们驻留在密文的其余部分。 在解密过程中,通过对密文中包含的MAC进行解密,对于任何差异与从恢复的明文生成的MAC进行比较,可以容易地检测到对密文的完整性的任何违反。
    • 20. 发明申请
    • User Authentication Via Biometric Hashing
    • 用户认证通过生物特征哈希
    • US20080209227A1
    • 2008-08-28
    • US11680433
    • 2007-02-28
    • Ramarathnam VenkatesanMariusz H. Jakubowski
    • Ramarathnam VenkatesanMariusz H. Jakubowski
    • H04L9/00
    • H04L9/3231H04L9/3236H04L2209/80
    • Techniques for authenticating biometric parameters via biometric hashing are described. In one implementation, a biometric parameter of a user (e.g., fingerprint image, blood-vessel pattern, retina scan, etc.) is captured. One or more biometric hashes are produced from the biometric parameter. To generate hashes that appear random, pseudorandom metrics are applied over the biometric parameter. The hashes are stored in association with user information that can be employed to authenticate the user. Subsequently, during authentication, a new biometric parameter is captured and hashes are computed from the parameter. The new biometric hashes are then compared with the predetermined stored hashes. If any of the new hashes are found to be identical, or sufficiently similar, to one or more of the predetermined biometric hashes, the biometric parameter is deemed valid and the user is authenticated.
    • 描述了通过生物测定散列认证生物特征参数的技术。 在一个实现中,捕获用户的生物特征参数(例如,指纹图像,血管图案,视网膜扫描等)。 从生物特征参数产生一个或多个生物特征散列。 为了产生出现随机的散列,伪随机度量被应用于生物特征参数。 与可用于认证用户的用户信息相关联地存储散列。 随后,在认证期间,捕获新的生物特征参数,并根据参数计算哈希值。 然后将新的生物识别散列与预定的存储的哈希进行比较。 如果任何新的散列被发现与一个或多个预定的生物统计学哈希相同或足够相似,则生物特征参数被认为是有效的并且用户被认证。