Sharif Digital Repository

Along with the proliferation of pervasive systems such as RFID systems and sensor networks, the demand for the low-cost, secure-enough primitives has continued to rise. Symmetric-key algorithms especially block ciphers still play an important role as secure ciphers that can be also consistent with the inherent restrictions of pervasive systems. Recently, a lot of block ciphers tailored for these conditions have been designed, such as Present, PrintCipher, Piccolo, and Twine. Biclique attack introduced in AsiaCrypt 2011 is the first and the only method that could break all versions of AES faster than brute-force attack in the single key model. Afterwards, the efficiency of this attack on some... 

In sending a man into space, the protection of the lives of the astronauts is very important and must ensure them stay healthy. To launch a human into space must design a system that if creates a problem can protect the lives of astronauts. To achieve this goal requires the design of a system for launch vehicle that be named launch cancellation system (emergency escape system). In this project, the launch escape system for manned lauch vehicle is designed. The cargo carrier serves as input for the problem and then the system is designed to build in our country. First, to study emergency escape systems in the world were discussed and sub-systems and scenario of flight was specified for...