A secure multidimensional point inclusion protocol
Proceedings of the 9th workshop on Multimedia & security
Protection and retrieval of encrypted multimedia content: when cryptography meets signal processing
EURASIP Journal on Information Security
Editorial: Signal processing in the encrypted domain
EURASIP Journal on Information 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
An efficient buyer-seller watermarking protocol based on composite signal representation
Proceedings of the 11th ACM workshop on Multimedia and security
Efficient linear filtering of encrypted signals via composite representation
DSP'09 Proceedings of the 16th international conference on Digital Signal Processing
Encrypted domain DCT based on homomorphic cryptosystems
EURASIP Journal on Information Security - Special issue on enhancing privacy protection in multimedia systems
Modulo reduction for paillier encryptions and application to secure statistical analysis
FC'10 Proceedings of the 14th international conference on Financial Cryptography and Data Security
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Signal processing tools working directly on encrypted data could provide an efficient solution to application scenarios where sensitive signals must be protected from an untrusted processing device. In this paper, we investigate an issue usually neglected in the proposed solutions for secure processing in the encrypted domain, that is the data expansion from the plaintext to the encrypted representation of signals, due to the use of cryptosystems operating on very large algebraic structures. A packed signal representation is proposed that allows to speed up pointwise operations on encrypted signal via parallel processing and to reduce the size of the whole encrypted signal.