Location based encryption

• Main Authors: PHUONG, Tran Viet Xuan, SUSILO, Willy, YANG, Guomin, YAN, Jun, LIU, Dongxi
• Format: text
• Language: English
• Published: Institutional Knowledge at Singapore Management University 2019
• Subjects: 2D/3D; Location based encryption; Constant ciphertext size; w-lBDHI; Information Security
• Online Access: https://ink.library.smu.edu.sg/sis_research/7409; https://ink.library.smu.edu.sg/context/sis_research/article/8412/viewcontent/location_based.pdf
• Institution: Singapore Management University

We first propose a 2D Location Based Encryption (LBE) scheme, where the setting includes a geography center system and the 2D triangle area including the set of locations. A user joining in the system is provided with a pre-arranged key, which belongs to her/his location. If the user’s location is belonging to this area, he/she can decrypt the message. Our proposed scheme achieves a constant ciphertext size in encryption algorithm and decryption cost. Beyond the 2D-LBE scheme, we explore the 3D-LBE scheme; whereby the location is set up in the 3D dimensions. This proposed scheme is an extension of 2D-LBE scheme, which the ciphertext is also constant. Both two schemes are proved in the selective model under the decisional ℓ−ℓ−wBDHI assumption.