Scrambler/descrambler and synchronizer for a data transmission system
    1.
    发明公开
    Scrambler/descrambler and synchronizer for a data transmission system 失效
    Scrambler,Descrambler und SynchronisiererfüreinDatenübertragungssystem。

    公开(公告)号:EP0549047A1

    公开(公告)日:1993-06-30

    申请号:EP92203934.2

    申请日:1992-12-15

    IPC分类号: H04L25/49

    CPC分类号: H04L25/03866

    摘要: In a system for de-/encoding data using (de)coding devices at either end of a transmission channel, the data sometimes comprise additional synchronisation information which is used to reduce the effect of faults in the transmission channel. If this synchronisation information is not already present, it is impossible in certain cases to add such information. The invention provides a system which, regardless of the presence of additional synchronisation information, is able to reduce the effect of faults. For this purpose, each (de)coding device is provided with means for comparing sequences of encoded data with at least one predetermined code word and for setting the associated coding device to a reset state in the event of equality. Because the predetermined code word repeats statistically in the encoded data, a fault adversely affects the decoding for not more than one time interval.

    摘要翻译: 在用于在传输信道的任一端使用(de)编码设备对数据进行解/编码的系统中,数据有时包括用于减少传输信道中故障影响的附加同步信息。 如果该同步信息尚未存在,则在某些情况下不可能添加此类信息。 本发明提供一种系统,无论是否存在额外的同步信息,都能够减少故障的影响。 为此,每个(de)编码装置设置有用于将编码数据的序列与至少一个预定代码字进行比较的装置,并且用于在相等的情况下将相关联的编码装置设置为复位状态。 由于预定代码字在编码数据中重复统计,故障不利地影响解码不超过一个时间间隔。

    Cryptographic data processing using cascade of cryptographic elements in feedback structure
    2.
    发明公开
    Cryptographic data processing using cascade of cryptographic elements in feedback structure 失效
    Kryptografische Datenverarbeitung unter Verwendung einer Kaskadierung kryptografischer Elemente in einerRückkoppelung。

    公开(公告)号:EP0673133A1

    公开(公告)日:1995-09-20

    申请号:EP95200632.8

    申请日:1995-03-15

    IPC分类号: H04L9/18

    摘要: The invention provides a device (1) for encrypting or decrypting data packets, comprising storage means (14) for temporarily storing data packets, identification means (15) for identifying data packets, processing means (11, 12, 13) for cryptographically processing data packets, and memory means (16) for storing cryptographic information. The processing means (11, 12, 13) comprise, according to the invention, a first (11) and a second (12) cryptographic element, the first cryptographic element (11) being designed for generating, on the basis of a first starting value, processing data for cryptographically processing a data packet, and the second cryptographic element (12) being designed for generating, on the basis of a second starting value, the first starting value. In addition, the processing means (11, 12, 13) according to the invention are designed for forming, on the basis of a cryptographically processed data packet, the second starting value, thereby ensuring the synchronization between corresponding encrypting and decrypting devices.

    摘要翻译: 本发明提供了一种用于加密或解密数据分组的装置(1),包括用于临时存储数据分组的存储装置(14),用于识别数据分组的识别装置(15),用于密码处理数据的处理装置(11,12,13) 分组,以及用于存储加密信息的存储装置(16)。 根据本发明,处理装置(11,12,13)包括第一密码元件(11)和第二密码元件(12),所述第一加密元件(11)被设计用于基于第一开始 值,处理用于密码处理数据分组的数据,以及被设计用于基于第二起始值生成第一起始值的第二密码元素(12)。 此外,根据本发明的处理装置(11,12,13)被设计用于基于密码处理的数据分组形成第二起始值,从而确保相应的加密和解密装置之间的同步。

    Cryptographic device
    4.
    发明公开
    Cryptographic device 失效
    Verschlüsselungseinrichtung。

    公开(公告)号:EP0666663A1

    公开(公告)日:1995-08-09

    申请号:EP95200192.3

    申请日:1995-01-27

    IPC分类号: H04L9/18

    CPC分类号: H04L9/065 H04L9/0637

    摘要: Two novel cryptographic modes are presented in which a perturbation of the encrypted character stream (b) always results in a permanent perturbation of the output stream (c) of the decryption device. Two options are presented: feedback of the encryption character stream (d and e, respectively) and simultaneously feeding back, in accordance with a function f, (option 1) the encrypted character stream (b) or (option 2) the original character stream (a) to the encryption side and, respectively, the output character stream (c) to the decryption side.

    摘要翻译: 提出了两种新颖的加密模式,其中加密的字符流(b)的扰动总是导致解密装置的输出流(c)的永久扰动。 提供两个选项:根据加密字符流(b)或(选项2)的函数f(选项1),原始字符流(d)分别加密加密字符流(d和e)的反馈并同时反馈 (a)到加密侧,分别输出到解密侧的输出字符流(c)。

    Method for enciphering a series consisting of at least one symbol
    6.
    发明公开
    Method for enciphering a series consisting of at least one symbol 失效
    维尔法赫恩zumVerschlüsselneiner愚蠢,死亡aus mindestens einem符号besteht。

    公开(公告)号:EP0399587A1

    公开(公告)日:1990-11-28

    申请号:EP90201136.0

    申请日:1990-05-21

    IPC分类号: H04L9/06

    摘要: The invention relates to an encipher algorithm on the basis of a secret key, in which use is made of a substitution function, S(n,k), known as S-box, with which a series of n symbols (for example bits) can be replaced by a series of k symbols. On the basis of the secret key, an arbitrary S-box is always generated in order to avoid the use of preselected S-boxes. Such a generation can generally take place in such a way that the substitution result almost certainly does have non-linearity, but not, that it moreover has good statistical properties. These properties will be obtained, either dynamically (figure 1), if the bits of a temporary substitution result (contents of register 3) are moreover combined, via a modulo-2 adder 5, with the bits of a series with a good statistical distribution (contents of register 4) to the proper substitution result (contents of register 6), or statically (figure 2), if a series of n bits (contents of register 2′) to be substituted is combined with the k bits of a series with a good statistical distribution (contents of register 4′) to a series of n + k bits, which is subsequently substituted by means of a substitution function S{n+k,k} of S-box 1′. The advantages are that a preselection of S-boxes with good statistical and non-linear properties can be dispensed with, and that the S-boxes always change and consequently are not known, which will benefit the strength of the encipher algorithm.

    摘要翻译: 本发明涉及一种基于秘密密钥的加密算法,其中使用称为S-box的替代函数S(n,k),利用该密钥算出一系列n个符号(例如位) 可以由一系列k个符号代替。 基于秘密密钥,总是生成任意的S盒,以避免使用预选的S盒。 这样的一代通常可以这样一种方式进行:替代结果几乎肯定具有非线性,而不是它具有良好的统计特性。 动态地获得这些属性(图1),如果临时替换结果的位(寄存器3的内容)进一步通过模2加法器5组合,具有良好统计分布的一系列位 (寄存器4的内容)到适当的替代结果(寄存器6的内容)或静态(图2),如果要替代的一系列n位(寄存器2分钟的内容)与一系列的k位组合 具有良好的统计分布(寄存器4分钟的内容)到一系列n + k位,随后由S盒1分钟的替代函数S {n + k,k}代替。 优点是可以省略具有良好统计和非线性特性的S盒的预选,并且S盒总是改变,因此不知道,这将有利于加密算法的强度。