Multiple size cryptographic key system
    2.
    发明公开
    Multiple size cryptographic key system 失效
    Einrichtung mit kryptographischenSchlüsselnmehrfacherLänge

    公开(公告)号:EP0766424A2

    公开(公告)日:1997-04-02

    申请号:EP96306395.3

    申请日:1996-09-04

    IPC分类号: H04L9/00

    CPC分类号: H04L9/088 H04L2209/12

    摘要: A system is employed for providing two different levels of protection for cryptographic devices transmitting digital information. The system is independent of the cryptographic algorithm used and works with any keyed cryptographic algorithm. High grade encryption (18) is used for data transmitted from the transmitter device (10) and employs an encryption key of "Y" bits. This information is decrypted at the receiver (21) by a decryption circuit (22) also having a "Y" key size. At the receiver, return information is encrypted by an encryption key (30) having "X" bits, where X = Y-Z, with Z being a variable. The low grade information encrypted at the receiver (21) is supplied back to the transmitter (10), which incorporates a decryption circuit (32) having an "X" key size for decrypting the lower grade information.

    摘要翻译: 采用一种系统为传输数字信息的加密设备提供两种不同级别的保护。 该系统独立于所使用的加密算法,并与任何密钥加密算法一起使用。 高级加密(18)用于从发射机装置(10)发送的数据,采用“Y”比特的加密密钥。 该信息在接收器(21)处由也具有“Y”键尺寸的解密电路(22)解密。 在接收机处,返回信息由具有“X”位的加密密钥(30)加密,其中X = Y-Z,其中Z是可变的。 在接收机(21)处加密的低等级信息被提供给发送机(10),该发送机(10)包括具有“X”密钥大小的解密电路(32),用于解密低级信息。