one of the most important sectors of each city where the citizens social interaction occur and urban life flow carry, are public spaces. one conditions for people presence in these spaces is securing their social security sense. nowadays different factors such as cultural, social, economic and physical in cities public spaces, especially in big cities like tehran, have cause abnormal social beh...

feeling secure is a prerequisite of any social, economic, cultural and political development and it is directly related to the level of development of the society. being aware of the situation of security feelings of society members plays a key role in recognizing the challenges and development strategies of society and can strengthen the infrastructures of the society. the present study aims t...

today, optimal performance and cost advantages of using internet telephony are obvious. despite current standardized techniques, voice transferring through protocol (voip) has lower security than traditional telephony. one of the most important security issues which should be noticed in using voip is end -to-end user2 identity, i.e. when  there is a connection between user a and b, user a shoul...

security as one of the basic human needs has a special place in relaxation, comfort and spiritual needs provision. for this reason, security is always of managers, planners, architects and urban designers' interest. solutions and strategies of security provision have been fundamentally changed following prevailing change of housing architecture patterns from homes to residential complexes ...

abstractexamine the concept of national security in a country, its nature, and consistency of its constituent elements and components as well as the factors threatening it requires a logical, coherent and systematic definition that will help us to have a correct analysis of the country’s situation once that definition is into practice. hence, research on the national security of the islamic rep...

block ciphers have wide applications for hardware and software implementations. in this paper, a new block cipher algorithm with provable security is proposed. the whole structure of the algorithm is novel and has a good encryption and decryption performance. additionally, it has good security with few number of rounds. the structure of the proposed algorithm consists of 4-rounds feistel-like w...