Key exchanging method based on public key certificate

A key exchange and public key certificate technology, which is applied in the usage of multiple keys/algorithms, user identity/authority verification, digital transmission systems, etc., can solve problems such as limiting the scope of communication, and achieve the effect of fast computing speed

Inactive Publication Date: 2003-10-15
ZHEJIANG UNIV
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Problems solved by technology

But the EKE protocol has a serious flaw, it requires both parties to...

Method used

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Embodiment Construction

[0012] When the present invention is used for network communication to exchange session keys, it is assumed that user A and user B exchange session keys. In this method, user A and user B share a system parameter (Z p , G, q, H, sig), here are examples where P is 512 bits and 1024 bits:

[0013] 512: P=0xED100D4D388990F60C7BD3C800D83355904433FF74E3BE0659D5C4E818239E600BD2D0DB7A5F42D2DAD99DF5DCC1014FD5B3F863D6632578230706C0A4CACCB7

[0014] 1024:P=0xED8E7692CDA48EE01F012E58AA7F06FD6203393B17C392DF6970B4934D4F613A35EB9A64208D26CA148B12FF28D6B18EF427BEFCAC7780AFD95229E759177137261A6D939FB5465F72D16EB3E7ECE01232081F003A3938555D49328E4860FF4F77FD1BBDB3222E0D0D021619EAA5F81F4C98E92C595801B04C3C9E3A0E4C0A53用户A和用户B进行会话密钥的交换步骤如下:

[0015] User A randomly selects w∈Zq, and calculates u=g w , and put (u, sig A (u)) sent to B; User B verifies A's signature Sig A (u), if the signature is incorrect, stop the exchange, otherwise randomly select x∈Zq, calculate y=g x , and pu...

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Abstract

The invention relates to a method of changing secret keys based on shared key certificates. It is a method of shared certificate and digital signature based on discrete logarithms in large prime number area and Diffie-Hellman secret key changing agreement, and with collision resist different functions. It is safe with a fast calculation speed, which has been proved.

Description

technical field [0001] The invention relates to a key exchange method for confidential or secure communication, in particular to a key exchange method based on public key certificates. Background technique [0002] Cryptographic algorithms and communication protocols with provable security are an important and difficult research topic in cryptography. The research on communication security and confidentiality revolves around finding stronger and better cryptosystems. Because the traditional cryptographic system uses a single key for encryption and decryption, once the encryption key is leaked, the entire cryptographic system will lose its function. Therefore, more and more defects have been exposed in practical applications, but because the encryption speed of the symmetric key system is much faster than that of the public key encryption, it has advantages in encrypting a large amount of data. Therefore, a hybrid encryption method is produced, whic...

Claims

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Application Information

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IPC IPC(8): H04L9/00H04L9/14H04L9/32
Inventor 朱华飞
Owner ZHEJIANG UNIV
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