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Computer Security – ESORICS 2012: 17th European Symposium on by Elli Fragkaki, Lujo Bauer, Limin Jia, David Swasey (auth.),

By Elli Fragkaki, Lujo Bauer, Limin Jia, David Swasey (auth.), Sara Foresti, Moti Yung, Fabio Martinelli (eds.)

This ebook constitutes the refereed lawsuits of the seventeenth ecu Symposium on machine safety, ESORICS 2012, held in Pisa, Italy, in September 2012. The 50 papers integrated within the ebook have been conscientiously reviewed and chosen from 248 papers. The articles are equipped in topical sections on safety and knowledge defense in genuine structures; formal types for cryptography and entry keep an eye on; protection and privateness in cellular and instant networks; counteracting man-in-the-middle assaults; community defense; clients privateness and anonymity; place privateness; balloting protocols and nameless verbal exchange; inner most computation in cloud structures; formal defense types; id established encryption and crew signature; authentication; encryption key and password defense; malware and phishing; and software program security.

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Extra resources for Computer Security – ESORICS 2012: 17th European Symposium on Research in Computer Security, Pisa, Italy, September 10-12, 2012. Proceedings

Example text

Once the data servers have started and registered, the cluster can begin to service clients. When a client first starts to use the cluster, it must create a session with the metadata server. The client creates two random session keys and sends them to the metadata server encrypted with public key of the server. The metadata server stores the keys and replies with an acknowledgment of the registration. All further communication will be authenticated by using a MAC with one of the keys associated with the client.

The initial paper describing GFS states that no security was built into the system, other than rudimentary checks at the metadata server: no access control checks at servers and no protection of data in flight [12]. Yahoo! has instrumented the Hadoop File System (HDFS) with additional access controls to address some of the security concerns of its users [29]. Their architecture uses Kerberos for user authentication and message integrity, and uses a token-based access control scheme (similar to Kerberos tickets).

File blocks only travel between and among clients and data servers and, as stated above, the file blocks are always encrypted before being transmitted. It is worth noting that in several instances, the key used to encrypt a file block is also sent with the block. However, the key is also encrypted with a semantically secure cipher. This layer of encryption should stymie the adversary A, unless A can acquire the key(s) or compute a non-negligible amount of information about the key(s). The semantic security of the cipher implies that the passive adversary, with overwhelming probability, can only learn a negligible amount of information about any transmitted key (likewise for any key used to encrypt the transmitted key).

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