Cryptography techniques play an important role in modern world. The purpose of such techniques is... more Cryptography techniques play an important role in modern world. The purpose of such techniques is to ensure the contents being unreadable to anyone except for parties who agreed to use some specific scheme. Moreover, current cryptography techniques provide more sophisticated services, such as message integrity, authentication, time stamping, and many others. There are two main approaches for cryptography: private-key cryptography and public-key cryptography (PKC). In this paper we focus on PKC techniques giving a comparison between three main techniques, namely, Public key Infrastructure (PKI), Identity- Based Cryptography (IBC) and Certificate less Public Key Cryptography (CL-PKC). In this research, a brief definition, advantages and disadvantages and analysis of main problem, namely, the revocation problem, are introduced for the three techniques. Also, a variety of available solutions to overcome the revocation problem in each technique are highlighted. Finally, some common appli...
International Conference on Computer Vision Theory and Applications, 2018
This paper proposes a wearable RGB camera-based system for sightless people through which they ca... more This paper proposes a wearable RGB camera-based system for sightless people through which they can easily and independently navigate their surrounding environment. The system uses a single head or chest mounted RGB camera to capture the visual information from the current user's path, and an auditory system to inform the user about the right direction to follow. This information is obtained through a novel alignment technique which takes as input a visual snippet from the current user's path and responds with the corresponding location on the training path. Then, assuming that the wearable camera pose reflects the user's pose, the system corrects the current user's pose to align with the corresponding pose in the training location. As a result, the user receives periodically an acoustic instruction to assist him in reaching his destination safely. The experiments conducted to test the system, in various collected indoor and outdoor paths, have shown that it satisfies its design specifications in terms of correctly generating the instructions for guiding the visually impaired along these paths, in addition to its ability to detect and correct deviations from the predefined paths.
Cryptography techniques play an important role in modern world. The purpose of such techniques is... more Cryptography techniques play an important role in modern world. The purpose of such techniques is to ensure the contents being unreadable to anyone except for parties who agreed to use some specific scheme. Moreover, current cryptography techniques provide more sophisticated services, such as message integrity, authentication, time stamping, and many others. There are two main approaches for cryptography: private-key cryptography and public-key cryptography (PKC). In this paper we focus on PKC techniques giving a comparison between three main techniques, namely, Public key Infrastructure (PKI), Identity- Based Cryptography (IBC) and Certificate less Public Key Cryptography (CL-PKC). In this research, a brief definition, advantages and disadvantages and analysis of main problem, namely, the revocation problem, are introduced for the three techniques. Also, a variety of available solutions to overcome the revocation problem in each technique are highlighted. Finally, some common appli...
International Conference on Computer Vision Theory and Applications, 2018
This paper proposes a wearable RGB camera-based system for sightless people through which they ca... more This paper proposes a wearable RGB camera-based system for sightless people through which they can easily and independently navigate their surrounding environment. The system uses a single head or chest mounted RGB camera to capture the visual information from the current user's path, and an auditory system to inform the user about the right direction to follow. This information is obtained through a novel alignment technique which takes as input a visual snippet from the current user's path and responds with the corresponding location on the training path. Then, assuming that the wearable camera pose reflects the user's pose, the system corrects the current user's pose to align with the corresponding pose in the training location. As a result, the user receives periodically an acoustic instruction to assist him in reaching his destination safely. The experiments conducted to test the system, in various collected indoor and outdoor paths, have shown that it satisfies its design specifications in terms of correctly generating the instructions for guiding the visually impaired along these paths, in addition to its ability to detect and correct deviations from the predefined paths.
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Papers by Reham Mohamed