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Powell Elementary School marquee in English
No full textMarquee sign at Powell Elementary School announcing school closures. The sign reads '3/16 - 3/31 No school'
Horse statue wearing a face mask
No full textFront gate horse statue wearing a face mask on the 600 block of A Street NE
Audio recording of Laura Farley on a walk
No full textAudio recording of Laura Farley as she walks around her neighborhood in Northeast and Southeast. Farley discusses the new reality of wearing face masks and interacting with family and friends virtually; how walking helps her feel present and connected to her family; and her perspective on springtime in the District
Improvements and Applications of Homomorphic Encryption
No full textSignificant security issues arise when organizations outsource their data processing and computation tasks to cloud platforms. Homomorphic encryption (HE) provides a promising solution to address security threats because it allows performing mathematical operations such as addition and multiplication on encrypted data instead of plaintexts to obtain the same results. Users can upload HE encrypted data to the cloud, have the cloud computing complete computation on the ciphertexts, and then decrypt the processed ciphertexts to obtain the results. A privacy-preserving data processing (PPDP) system was recently proposed, which extends HE from a single-user system to a multi-user one by employing a ciphertext re-encryption technique to allow multiple users to access the processed ciphertexts. However, the size of HE encrypted data is much larger than the original data size, which causes a high bandwidth to transmit the ciphertexts to the cloud. In addition, homomorphic encryption introduces high computation complexity at the user devices. These user devices could be mobile or Internet of Things devices with low computation power. In this dissertation, we propose a multi-user Compact Privacy-Preserving Data Processing (CPPDP) system, which allows a user to upload the ciphertexts encrypted by the symmetric cryptographic algorithm such as Data Encryption Standard (DES) algorithm, to the cloud. The cloud parties perform the homomorphic encryption on DES ciphertexts and then DES decryption without disclosing the original information. CPPDP significantly reduces computation complexity at user devices and the bandwidth requirements between the user devices and the cloud. It can support mathematical computations, including Addition, Subtraction, and Multiplication over ciphertexts through the cooperation of the cloud Data Service Provider (DSP) and the Access Control Server (ACS). Moreover, the Genetic Algorithm (GA) based random number generator is designed to produce random keys.
We have proved the security of the proposed CPPDP scheme. The performance and effectiveness of CPPDP have been analyzed and compared with the state-of-the-art PPDP scheme through simulations. The evaluation results show that CPPDP achieves the same security and computations performance while significantly lowering the users’ data encryption complexity. CPPDP also greatly reduces the bandwidth when transmitting encrypted data to the cloud as well as the storage requirement when storing the ciphertexts in the cloud. A CPPDP-based cloud database for storing and processing the employees’ data belonging to a university is implemented for the proof of concept, which enhances the data security and flexibility to access and analyze the data in the cloud environment.Computer scienceCloud Application, Cloud Computing, Genetic Algorithm, Homomorphic Encryption, Outsourced Processing, Symmetric Key EncryptionElectrical Engineering and Computer ScienceDegree Awarded: Ph.D. Electrical Engineering and Computer Science. The Catholic University of Americ
Two nurses outside of MedStar Georgetown University Hospital
No full textTwo nurses wearing masks outside of MedStar Georgetown University Hospital. A sign on the awning behind them reads, 'Surgery Center.
Nurse outside of Sibley Memorial Hospital
No full textNurse wearing gloves and a mask outside of Sibley Memorial Hospital. They hold a Talbots bag containing donated chocolate-covered strawberries for frontline staff
Sign on the door at Safeway advertising senior hours
No full textSign on the door at Safeway that reads, 'Help us help our neighbors, each Tuesday and Thursday, 7 AM to 9 AM: we ask for your help to try to avoid shopping during these short windows of time and reserve them for senior citizens and other at-risk members of our community. We appreciate your patience and support as you help us with this temporary request.
Canon 517, §2: Origins, Development and Particular Application and Implementation in the Diocese of the Caroline Islands in Relation to Deacons.
No full textCanon 517, §2: Origins, Development and Particular Application and Implementationin the Diocese of the Caroline Islands in Relation to Deacons.Canon lawCanon LawDegree Awarded: J.C.L. Canon Law. The Catholic University of Americ
Be Safe' sign hanging on porch
No full textHomemade brown sign that reads 'Be Safe' in multiple colors hangs on a porch railing