Autonomously group key update method

Abstract

The invention discloses an autonomously group key update method comprising the steps as follow: a message sender sends a plaintext m; a key source distributed an initial key Kl' and an update key Kj', wherein a private secrete key is registered when a member joins, and the private secrete key is cancelled when the member quits; encrypting the plaintext m by using the update key Kj' and an encryption algorithm to acquire a ciphertext c which is equal to EKl'(m); sending the ciphertext to a next node; decrypting the ciphertext c by using the update key Kj' and the encryption algorithm to acquire the plaintext m; executing a key interaction protocol; and operating a network. An autonomously group key management scheme is designed via a DH protocol and a polynomial, and has the encryption and decryption characteristics of the single encryption key and the multiple decryption keys, and during an update process, an update member locally and autonomously updates the public encryption key without the support of an only key management center, so that validity of the decryption keys of the non-update members is protected, key update delay and computation overhead of the non-update members are reduced, and thus the method is accordant with an autonomous key update method, and applicable to wireless network scenes with limited delay.

Description

technical field [0001] The invention relates to the technical field of mobile Internet key management, in particular to an autonomous group key update method capable of reducing key update delay. Background technique [0002] Group key management is one of the basic technologies of wireless network security. With the widespread application of distributed wireless networks, distributed group key management (DGKM) has become a security research hotspot. DGKM has the advantages of not needing the support of the key management center KMC, open channel negotiation and tolerance to failed nodes, but because all nodes share the key negotiation task, it has the disadvantages of long delay, large computational overhead and all members participating in the update. [0003] With the continuous improvement of high-performance processors and energy levels, deep space networks, DTN networks, and opportunistic networks have put forward more stringent requirements for key management delays....

AI Technical Summary

Problems solved by technology

DGKM has the advantages of not needing the support of the key management center KMC, open channel negotiation and tolerance of failed nodes, but because all nodes share the key negotiation task, it has the disadvantages of long delay, large computational overhead and all members participating in the update

[0003] With the continuous improvement of high-performance processors and energy levels, deep space networks, DTN networks, and opportunistic networks have put forward more stringent requirements for key management delays. The group key management scheme based on the key interaction protocol is in In the key update, all members need to recalculate and publish public key information, and need to pay for the delay of member interaction, which is not suitable for wireless networks supported by unreliable end-to-end services, limited delay and asynchronous mechanism

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