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Trust and security in collaborative computing by Xukai Zou

By Xukai Zou

Computing device networks are compromised through a number of unpredictable components, akin to hackers, viruses, junk mail, faults, and procedure disasters, hindering the total usage of computers for collaborative computing one of many ambitions for the subsequent iteration of the net. It comprises the services of knowledge communique, source sharing, workforce cooperation, and activity allocation. One renowned instance of collaborative computing is grid computing.

This monograph considers the most recent efforts to improve a relied on atmosphere with the excessive safeguard and reliability wanted for collaborative computing. the real modules handled comprise safe crew communique, entry keep watch over, dependability, grid computing, key administration, intrusion detection, and hint again. furthermore, a true undertaking for constructing a national clinical details method with excessive dependability and defense is defined.


  • Secure crew verbal exchange (SGC);
  • Cryptography dependent entry regulate;
  • Intrusion Detection and Defence;
  • Security in Grid Computing;
  • Trusted and Seamless clinical info platforms.

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The new member gets the new key kN through the secure channel he/she shares with the GC. In case of a member leave, the GC selects a new group key kN and sends it to the remaining members of the group, over the secure channels, one key at a time using unicast messages. Clearly, the naive solution proposed in GKMP is not scalable. GKMP is also inefficient due to the use of unicast based secure channels very frequently. The Core based tree approach [Bakkardie (1996)] assumes a group initiator (GI).

8 shows a DGKD tree and the nodes’ sponsors. The sponsors can be determined efficiently. A co-distributor of a sponsor is the sponsor of a node on another path whose key is not known to the original sponsor. Whenever there is a member change (either join or leave), the sponsor initiates the key change and rekeying process. The rekeying process consists of 2 rounds. In the first round, the sponsor sends the changed keys to co-distributors, by encrypting the new keys with the public keys of the codistributors.

Rn−1r0 , where ri is the secret share of a member Ui . The main advantage of the BD protocol is that it requires very low computational overhead. However, the communication cost is high (2n broadcasts are required). Another extension of the DH protocol was provided by Steiner at. 3. The group key achieved in the protocols is of the form g r0 r1 ···rn−1 , where the symbols have their usual meaning. In 1998, Becker and Wille [Becker and Wille (1998)] proposed a group key agreement protocol based on the Diffie-Hellman key exchange, called the Octopus protocol.

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