1. 1. J. Zhou, X. Liu, and O. C. Au, “On the design of an efficient encryption-then-compression system,” in Proc. ICASSP, 2013, pp. 2872–2876.
   2. T. Bianchi, A. Piva, and M. Barni, “On the implementation of the discrete Fourier transform in the encrypted domain,” IEEE Trans. Inf. Forensics Security, vol. 4, no. 1, pp. 86–97, Mar. 2009.
   3. T. Bianchi, A. Piva, and M. Barni, “Encrypted domain DCT based on homomorphic cryptosystems,” EURASIP J. Inf. Security, 2009, Article ID 716357.
   4. T. Bianchi, A. Piva, and M. Barni, “Composite signal representation for fast and storage-efficient processing of encrypted signals,” IEEE Trans. Inf. Forensics Security, vol. 5, no. 1, pp. 180–187, Mar. 2010.
   5. M. Barni, P. Failla, R. Lazzeretti, A.-R. Sadeghi, and T. Schneider, “Privacy-preserving ECG classification with branching programs and neural networks,” IEEE Trans. Inf. Forensics Security, vol. 6, no. 2, 452–468, Jun. 2011.
   6.  Z. Erkin, T. Veugen, T. Toft, and R. L. Lagendijk, “Generating pri-vate recommendations efficiently using homomorphic encryption and data packing,” IEEE Trans. Inf. Forensics Security, vol. 7, no. 3, pp.1053–1066, Jun. 2012.
   7. M. Johnson, P. Ishwar, V. M. Prabhakaran, D. Schonberg, and K. Ramchandran, “On compressing encrypted data,” IEEE Trans. Signal Process., vol. 52, no. 10, pp. 2992–3006, Oct. 2004.
   8.  D. Schonberg, S. C. Draper, and K. Ramchandran, “On blind compres-sion of encrypted correlated data approaching the source entropy rate,” in Proc. 43rd Annu. Allerton Conf., 2005, pp. 1–3.
   9.  D. Schonberg, S. C. Draper, and K. Ramchandran, “On compression of encrypted images,” in Proc. IEEE Int. Conf. Image Process., Oct. 2006, pp. 269–272