Výsledky vyhledávání - "Witold Litwin"

Manifesto for Improved Foundations of Relational Model

Autor: Witold Litwin

Publikováno v: EUSPN/ICTH

Normalized relations extended with inherited attributes can be more faithful to reality and support logical navigation free queries, properties available at present only through specific views. Adding inherited attributes can be nonetheless always le

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f71ed1ba60461606d1131fbbb8d3cad9
http://arxiv.org/abs/1912.08352

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SQL for Stored and Inherited Relations

Autor: Witold Litwin

Publikováno v: Proceedings of the 21st International Conference on Enterprise Information Systems-(Volume 1)
21st International Conference on Enterprise Information Systems (ICEIS 2019)
21st International Conference on Enterprise Information Systems (ICEIS 2019), May 2019, Heraklion, Greece. pp.37-48, ⟨10.5220/0007676700370048⟩
ICEIS (1)

A stored and inherited relation (SIR) is a stored relation (SR) extended with inherited attributes (IAs) calculated as in a view. Without affecting the normal form of the SR, IAs can make queries free of logical navigation or of value expressions. A

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::931bc6130f7f46b76a18c8d8a2c2f4b6
https://hal.archives-ouvertes.fr/hal-02309464

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Trusted cloud SQL DBS with on-the-fly AES decryption/encryption

Autor: Thomas Schwarz, Sushil Jajodia, Witold Litwin

Publikováno v: IEEE BigData

A Trusted Cloud Database System manages client-side encrypted cloud DBs. Queries may include encryption keys. The DBS decrypts/encrypts the data on-the-fly at the cloud. Plaintext is only in protected run-time variables. Stored data are by default pr

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8643839020008f0bbad5abfd8bb31696
https://doi.org/10.1109/bigdata.2016.7841034

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On-the-Fly AES256 Decryption/Encryption for Trusted Cloud SQL DBS: Position Statement

Autor: Sushil Jajodia, Witold Litwin, Thomas Schwarz

Publikováno v: DEXA Workshops

We propose the client-side AES256 encryption for a cloud SQL DB. We trust the safety of the cloud DBS run-time values, e.g., through a moving target defense. The client may send AES key(s) with the query. These become run-time values for on-the-fly d

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2ce8ad9b09468e37478da1292897feaa
https://doi.org/10.1109/dexa.2016.020

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AS-Index: A Structure For String Search Using n-grams and Algebraic Signatures

Autor: Thomas Schwarz, Witold Litwin, Philippe Rigaux, Cédric du Mouza, Camelia Constantin

Publikováno v: Journal of Computer Science and Technology
Journal of Computer Science and Technology, 2016, 31 (1), pp.147-166. ⟨10.1007/s11390-016-1618-6⟩
Journal of Computer Science and Technology, Springer Verlag, 2016, 31 (1), pp.147-166. ⟨10.1007/s11390-016-1618-6⟩

International audience; We present the AS-Index, a new index structure for exact string search in disk resident databases. AS-indexrelies on a classical inverted file structure, its main innovation being a probabilistic search based on the properties

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bb5f79b549ed7750fa7ba3239bf08b0d
https://hal.science/hal-01126550/document

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Large-scale indexing of spatial data in distributed repositories: the SD-Rtree

Autor: Philippe Rigaux, Cédric du Mouza, Witold Litwin

Publikováno v: The VLDB Journal
The VLDB Journal, Springer, 2009, 19, pp.933-958

We propose a scalable distributed data structure (SDDS) called SD-Rtree. We intend our structure for point, window and kNN queries over large spatial datasets distributed on clusters of interconnected servers. The structure balances the storage and p

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::94061f0c0f420a12afecb9e6f1e47a89
https://doi.org/10.1007/s00778-009-0135-4

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An Autonomous Data Structure for Brute Force Calculations in the Cloud

Autor: Thomas Schwarz, Witold Litwin, Silvia Grampone

Publikováno v: CloudCom

Commercial cloud systems allow massively parallel execution of a computing task for little money. We want to exploit this economic opportunity by solving classical problems in Operations Research through complete enumeration, especially if these prob

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::453fa3d7092320f758ce737179ed2e71
https://doi.org/10.1109/cloudcom.2015.17

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Numerical SQL Value Expressions Over Encrypted Cloud Databases

Autor: Sushil Jajodia, Witold Litwin, Thomas Schwarz

Publikováno v: Database and Expert Systems Applications. 26th International Conference (DEXA 2015), Proceedings, Part II
26th International Conference on Database and Expert Systems Applications (DEXA 2015)
26th International Conference on Database and Expert Systems Applications (DEXA 2015), Sep 2015, Valencia, Spain. pp.455-478, ⟨10.1007/978-3-319-22852-5_38⟩
Lecture Notes in Computer Science ISBN: 9783319228518
DEXA (2)

LNCS, volume 9262; Cloud databases often need client-side encryption. Encryption however impairs queries, especially with numerical SQL value expressions. Fully homomorphic encryption scheme could suffice, but known schemes remain impractical. Partia

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8446469d57025ad0f575f88898909e44
https://hal.archives-ouvertes.fr/hal-01616396/file/conf82.pdf

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