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    • 8. 发明授权
    • Public key encryption with digital signature scheme
    • 具有数字签名方案的公钥加密
    • US07707420B1
    • 2010-04-27
    • US09594368
    • 2000-06-15
    • Herb A. Little
    • Herb A. Little
    • H04L9/00H04L9/30
    • H04L9/30H04L9/3247H04L2209/80
    • An improved encryption and digital signature system and method in accordance with the invention reuses an encryption ephemeral key pair from an encryption process in a digital signature process. The reuse of the encryption ephemeral key pair in the digital signature process advantageously results in reduced byte size of the digital signature and reduction of costly computation overhead. In a preferred embodiment, the invention is based on the El Gamal encryption scheme and the Nyberg-Rueppel signature scheme. The present invention is particularly useful for operation in conjunction with small communication devices having limited processing and storage, wherein such devices may communicate via bandwidth sensitive RF links.
    • 根据本发明的改进的加密和数字签名系统和方法在数字签名过程中重用来自加密过程的加密短暂密钥对。 数字签名过程中加密短暂密钥对的重用有利地减少了数字签名的字节大小,降低了昂贵的计算开销。 在优选实施例中,本发明基于El Gamal加密方案和Nyberg-Rueppel签名方案。 本发明对于具有有限处理和存储的小型通信设备的操作特别有用,其中这样的设备可以经由带宽敏感的RF链路进行通信。
    • 9. 发明授权
    • Block-wise adaptive statistical data compressor
    • 块式自适应统计数据压缩器
    • US6075470A
    • 2000-06-13
    • US31418
    • 1998-02-26
    • Herb A. LittleHugh R. Hind
    • Herb A. LittleHugh R. Hind
    • H03M7/30H03M7/40H03M7/46H03M7/00
    • H03M7/40H03M7/3086H03M7/46
    • A block-wise adaptive statistical data compressor is disclosed that operates by replacing characters in a data block with super-character codewords comprising a variable length prefix and a fixed length index. The codewords are determined by treating a plurality of groups of characters as super-character groups and then adapting the codewords, for each data block, based upon the actual frequency of occurrence of the characters in each group. The super-character prefix value identifies the group to which a particular character belongs, and the index value identifies the individual character of the group. By grouping and indexing the characters into these super-character groups, the present invention models a particular data block using a fraction of the information generally required by a fixed statistical compressor. Also disclosed are multi-stage lossless block data compressors that include the block-wise adaptive statistical compressor and also include a clustering stage and a reordering stage. The clustering stage clusters like characters into similar locations within the data block, and the reordering stage reorders the data to generate an expected skew in the frequency distribution of characters in the data block so that the block can be more efficiently compressed by the block-wise adaptive statistical compressor.
    • 公开了一种块式自适应统计数据压缩器,其通过用包括可变长度前缀和固定长度索引的超字符码字替换数据块中的字符来操作。 通过将多个字符组视为超字符组来确定码字,然后根据每个组中的字符的实际发生频率对每个数据块调整码字。 超字符前缀值标识特定字符所属的组,索引值标识组的单个字符。 通过将字符分组和索引到这些超级字符组中,本发明使用固定统计压缩器通常需要的信息的一部分来模拟特定数据块。 还公开了包括块自适应统计压缩器并且还包括聚类阶段和重新排序阶段的多级无损块数据压缩器。 聚类阶段将字符集合到数据块内的类似位置,并且重新排序阶段重新排序数据以在数据块中的字符的频率分布中产生期望的偏移,使得可以通过块方式更有效地压缩该块 自适应统计压缩机。