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Identifier network is one of promising network architectures to solve IP dual-property issues by separating network into access network and core network. The key design is the identifier/location separation mechanism which introduces user accessing address space and network routing address space to represent the identifier and location of terminal, respectively. The core network can prevent the cyber attacks by controlling the mapping relationship between Accessing IDentifier (AID) and Routing IDentifier (RID) via the mapping system. While the access network is facing serious security problems which makes it easily to be attacked. Therefore, this work focuses on access network security and studies AID shuffling mechanism by randomizing identifier through virtual AID. However, how the mapping servers allocate virtual AID to terminals in a reasonable way is quite difficult. To solve this problem, we propose an AID shuffling mechanism based on Group-buying Auction for Identifier Network (GAIN) among mapping servers, accessing switching routers and terminals. First, GAIN decides a group bid for each group leader and the winning virtual AID range for each group. Second, the mapping servers allocate the identifier for each terminal. Third, GAIN determines how much each winning group leaders should pay for virtual AID range to each mapping server in the winning group. We evaluate the identifier assignment of GAIN in terms of rationality, budget balance, computational tractability and truthfulness. The large-scale simulations are performed to evaluate GAIN, and the results are presented to verify the effectiveness and efficiency by comparing with other state-of-the-art approaches.

Bitcoin is promoted as decentralized cryptocurrency by using pseudonym to achieve anonymity. Unfortunately, numerous seminal works have demonstrated that Bitcoin only offers weak anonymity in practice. Indeed, the practical technologies of clustering and flow analysis are much effective for tracing Bitcoin transaction and thereby revealing the owner involved. Otherwise said, user's privacy in Bitcoin has been sadly degenerated to be linkable. In this paper, we propose a completely decentralized scheme that can provide full anonymity in Bitcoin. The idea behind the output is to exploit a secure escrow address, which is consensual by all the involved users. The escrow address is generated from the trick of cryptographically secure distributed key generation and can then be used for mixing transactions in Bitcoin. Our protocol is secure against malicious adversaries. The users can jointly perform the protocol and successfully accomplish the transaction without the help of any (trusted) third party and no extra fees. Besides, our proposal is completely compatible with the current Bitcoin architecture.