High-performance complex event processing over streams
Proceedings of the 2006 ACM SIGMOD international conference on Management of data
The CQL continuous query language: semantic foundations and query execution
The VLDB Journal — The International Journal on Very Large Data Bases
SPADE: the system s declarative stream processing engine
Proceedings of the 2008 ACM SIGMOD international conference on Management of data
Order-Preserving Symmetric Encryption
EUROCRYPT '09 Proceedings of the 28th Annual International Conference on Advances in Cryptology: the Theory and Applications of Cryptographic Techniques
StreamShield: a stream-centric approach towards security and privacy in data stream environments
Proceedings of the 2009 ACM SIGMOD International Conference on Management of data
Controlling data in the cloud: outsourcing computation without outsourcing control
Proceedings of the 2009 ACM workshop on Cloud computing security
Public-key cryptosystems based on composite degree residuosity classes
EUROCRYPT'99 Proceedings of the 17th international conference on Theory and application of cryptographic techniques
CryptDB: protecting confidentiality with encrypted query processing
SOSP '11 Proceedings of the Twenty-Third ACM Symposium on Operating Systems Principles
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In order to process a few thousands of streams in real-time, public clouds seem to be an excellent choice since it supports massively amount of computing resources. A public cloud may be managed by a third party and outside the firewall of the organization, which may make it questionable whether data are managed confidentially. This paper proposes a scheme that evaluates queries over encrypted data streams. Our scheme is based on CryptDB and its modification. We describe performance issues incurred by our scheme, and propose an approach to reduce the encryption costs and amounts of transmitted data size, and an approach to reduce memory usage by analyzing a plan tree in an SPE. The result of experiments showed that applying AP-1 reduces 90% memory size, while applying AP-2 reduces 11% memory size.