Identity Based Cryptography (IBC) is well known method in the field of security, however it has an inherent drawback of Key Escrow under which central key generation center is a sole issuing authority of private key and thus could misuse it. Our survey finds numerous solutions of key escrow; out of them secure key issuing protocol (SKIP) is most prominent. However, there are scopes for improvin...

The concept of an Ephemerizer system has been introduced in earlier works as a mechanism to ensure that a file deleted from the persistent storage remains unrecoverable. The principle involved storing the data in an encrypted form in the user’s machine and the key to decrypt the data in a physically separate machine. However the schemes proposed so far do not provide support for fine-grained us...

1. Dept. of Epidemiology and Biostatistics, School of Public Health , Shahid Beheshti University of Medical Sciences, Tehran .Iran 2. Abadan School of Medical Sciences, Abadan, Iran 3. Minimally Invasive Surgery Research Center, Iran University of Medical Sciences , Tehran, Iran 4. Dept. of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran .Iran

Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran, Noor Ophthalmology Research Center, Noor Eye Hospital, Tehran, Iran, Farabi Eye Hospital, Tehran University of Medical Sciences, Tehran, Iran, Department of Public Health, Shahroud University of Medical Sciences, Shahroud, Iran, Education Development Center, Tehran Univers...

1. Dept. of Social Medicine, School of Medicine, Rafsanjan University of Medical Sciences, Rafsanjan, Iran 2. Minimally Invasive Surgery Research Center, Iran University of Medical Sciences, Tehran, , Iran 3. Dept. of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran 4. Dept. of Epidemiology and Biostatistics, School of Public Health, H...

Mehdi Jafari, Arash Rashidian, Farid Abolhasani, Kazem Mohammad, Shahram Yazdani, Patricia Parkerton, Masud Yunesian, Feizollah Akbari and Mohammad Arab* Department of Health Services Management, School of Health Services Management, Iran University of Medical Sciences, Tehran, Iran Department of Health Management and Economics, School of Public Health, Tehran University of Medical Sciences, Te...