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Repetition Pattern Attack on Multi-word-containing Securestring 2.0 Objects 11

Repetition Pattern Attack on Multi-word-containing SecureStr...

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11th International Conference on Distributed Computing and Internet Technology (ICDCIT)

作者： Fahrnberger, Guenter Univ Hagen North Rhine Westphalia Germany

ISBN: (纸本)9783319149769;9783319149776

Cloud computing appeals to private individuals and particularly enterprises at a progressive rate, but a noticeable percentage of them refuse it due to mistrust or missing commitment to security. The cryptosystem Securestring 2.0 was designed to outweigh these deficits through the support of blind computations on character strings. Repetition pattern attacks count among the most hazardous enemies of Securestring 2.0 objects because reoccurring ciphergrams within them may reveal linguistic identifying features of the correspondent plaintext. This paper analyzes and compares the success probability of repetition pattern attacks on the following three sorts of Securestring 2.0 objects: singleword- containing ones, multi-word-containing ones with a known number of words plus unknown delimiter positions, and multi-word-containing ones with an unknown number of words plus unknown boundary locations. The latter type is expected to provide the highest privacy.

关键词： Blind computing character string character string function character string operation Cloud Cloud computing Dictionary Attack Repetition Pattern Repetition Pattern Attack Secure computing string string function string operation

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A Second View on Securestring 2.0

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10th International Conference on Distributed Computing and Internet Technology (ICDCIT)

作者： Fahrnberger, Guenter Univ Hagen Univ Str 1 D-58097 Hagen Germany

ISBN: (纸本)9783319044835;9783319044828

Many companies have thought about using external hosting solutions. Cloud computing as such a solution attracts prospective users who want to avoid initial costs and standing expenses with the underlying pay-as-you-use model. The outsourcing of sensitive information implies security risks, like eavesdropping and sabotage, for them as soon as they pass any unconfident area. If an outhouse hosting solution serves as data storage only, then an end-to-end cryptosystem without the necessity of having homomorphic properties comes up with the answer. Moreover, secure computations on the encrypted data need the use of more complex cryptosystems. Securestring 1.0 [3] and Securestring 2.0 [4] were proposed as such complex cryptosystems that focus on computing on encrypted character strings in untrustworthy environments (like clouds). While Securestring 1.0 offered a too inflexible approach, Securestring 2.0 as its improvement was introduced textually at a high level only so far. This paper contributes to foster the understanding of Securestring 2.0 by providing performance analysis for its supported operations plus formal definitions, theorems and proofs.

关键词： blind computing character string character string function character string operation cloud cloud computing secure computing string function string operation

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Securestring 3.0 A Cryptosystem for Blind Computing on Encrypted character strings 11

SecureString 3.0 A Cryptosystem for Blind Computing on Encry...

引用

11th International Conference on Distributed Computing and Internet Technology (ICDCIT)

作者： Fahrnberger, Guenter Heneis, Kathrin Univ Hagen North Rhine Westphalia Germany Univ Vienna A-1010 Vienna Austria

ISBN: (纸本)9783319149769;9783319149776

If (electronic) computations need to be undertaken, then mostly performance or commercial aspects lead to the selection for an optimal executing computer. In case the beneficiary of the computation upshots does not wholly confide in any computers except his ones, trust becomes his major decision criterion instead. Blind computing can do the trick to (re) win the beneficiary's confidence. This paper ameliorates the well-known cryptosystem Securestring 2.0 concerning privacy through pangram ciphertexts and referring integrity through secret sharing. The emerging cryptosystem of this amelioration is called Securestring 3.0 that facilities blind computing on encrypted character strings through an untrusted host.

关键词： Blind computing character string character string function character string operation Cloud Cloud computing Secret Sharing Secure computing string string function string operation

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