1. Amazon, Amazon simple storage service. URL: http://aws.amazon.com/s3.
2. Megaupload, Megaupload. URL: http://www.megaupload.com.
3. D. Song, D. Wagner, A. Perrig, Practical techniques for searches on encrypted data, in: Proc. of IEEE Symposium on Security and Privacy, 2000, p. 44.
4. D. Boneh, G.D. Crescenzo, R. Ostrovsky, G. Persiano, Public key encryption with keyword search, in: Proc. of Proc. of EUROCRYPT 2004, 2004, pp. 506–522.
5. Privacy preserving keyword searches on remote encrypted data, Cryptology ePrint Archive, Report 2004/051;Chang,2004