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    • 5. 发明授权
    • Storage and recovery of cryptographic key identifiers
    • 加密密钥标识符的存储和恢复
    • US08621241B1
    • 2013-12-31
    • US12109693
    • 2008-04-25
    • David Stephenson
    • David Stephenson
    • G06F12/14H04L29/06
    • G06F12/1408G06F12/14H04L29/06H04L63/04H04L67/28
    • Example embodiments provide various techniques for storing and recovering a cryptographic key identifier that may be used to recover encrypted data. The cryptographic key identifier may be stored with the encrypted data itself. In an example, the cryptographic key identifier may be stored in particular blocks on a logical disk that are specifically designated to store the cryptographic key identifier. To store the cryptographic key identifiers in the designated blocks, the data within the blocks is compressed to fit the cryptographic key identifiers within the blocks. This cryptographic key identifier can be recovered at a later time by locating the designated blocks and retrieving the cryptographic key identifier from the blocks.
    • 示例性实施例提供了用于存储和恢复可用于恢复加密数据的加密密钥标识符的各种技术。 加密密钥标识符可以与加密数据本身一起存储。 在一个示例中,密码密钥标识符可以被存储在专门指定用于存储加密密钥标识符的逻辑盘上的特定块中。 为了将加密密钥标识符存储在指定的块中,块内的数据被压缩以适应块内的加密密钥标识符。 可以在稍后时间通过定位指定块并从块中检索加密密钥标识符来恢复该加密密钥标识符。
    • 10. 发明授权
    • Multi-element lens system
    • 多元素透镜系统
    • US5818632A
    • 1998-10-06
    • US421174
    • 1995-04-13
    • David Stephenson
    • David Stephenson
    • G01B9/02G02B5/18G02B27/44G01B11/00
    • G01B9/02057G01B9/02039G02B27/4205G02B5/189
    • A multi-element refractive/diffractive lens system, especially useful in an interferometer of the Fizeau type for forming a partially reflective end of the cavity and focusing collimated laser light at a focus in the cavity, uses a plurality of lens elements all of which are plano concave or plano convex singlets and may be either spherical or cylindrical. The lens has a diffractive element which compensates for aberrations due to the refractive elements of the lens system and enables the lens system to be formed from relatively few refractive elements which are all plano-convex or plano-concave singlets thereby providing cost savings arising out of the reduction in the amount of glass material and number of lens elements. Since the lens system is especially suitable for use in a Fizeau type interferometer, it may be of the type called a Fizeau lens.
    • 一种多元折射/衍射透镜系统,特别适用于用于形成空腔的部分反射端的Fizeau型干涉仪,并且将准直激光聚焦在空腔中的焦点处,使用多个透镜元件 平凹或平凸单体,可以是球形或圆柱形。 该透镜具有补偿由于透镜系统的折射元件引起的像差的衍射元件,并且能够使透镜系统由相对较少的折射元件形成,这些折射元件都是平凸的或平凹的单体,由此提供了由 玻璃材料的量的减少和透镜元件的数量。 由于透镜系统特别适用于Fizeau型干涉仪,所以可以是所谓的Fizeau透镜。