公开(公告)号：US4200770A

公开(公告)日：1980-04-29

申请号：US830754

申请日：1977-09-06

Applicant: Martin E. Hellman ,  Bailey W. Diffie ,  Ralph C. Merkle

Inventor： Martin E. Hellman ,  Bailey W. Diffie ,  Ralph C. Merkle

IPC: H04L9/08 ,  H04L9/04

CPC classification number: H04L9/0844 ,  H04L2209/60

Abstract: A cryptographic system transmits a computationally secure cryptogram over an insecure communication channel without prearrangement of a cipher key. A secure cipher key is generated by the conversers from transformations of exchanged transformed signals. The conversers each possess a secret signal and exchange an initial transformation of the secret signal with the other converser. The received transformation of the other converser's secret signal is again transformed with the receiving converser's secret signal to generate a secure cipher key. The transformations use non-secret operations that are easily performed but extremely difficult to invert. It is infeasible for an eavesdropper to invert the initial transformation to obtain either conversers' secret signal, or duplicate the latter transformation to obtain the secure cipher key.

Abstract translation: 加密系统通过不安全的通信信道发送计算安全密码，而不预先设置密码密钥。 由交换机从交换的变换信号的变换产生安全密码密钥。 会话者每个都拥有一个秘密信号，并与另一个会话者交换秘密信号的初始变换。 接收到的转接者的秘密信号的接收变换再次用接收转发者的秘密信号进行变换，生成安全密码密钥。 转换使用易于执行但非常难以反转的非秘密操作。 窃听者反转初始转换以获得会话者的秘密信号是不可行的，或者复制后一种转换以获得安全密码密钥。