, control and audit is a primary method of protecting system resources (Processor, Memory, UFS & Encryption Key) from the …. The cryptographic control (Encryption key) is a primary method of protecting system resources. The control is directly …

primitive in cloud computing, homomorphic encryption (HE) can evaluate on ciphertext directly without decryption, thus avoid … ciphertexts encrypted by the same public key. Adopting the idea of proxy re-encryption, and focusing on the compatibility of … computation, the authors provide a pairing-based multi-user homomorphic encryption scheme. The scheme is a somewhat homomorphic …

properties.In the first part of this dissertation, we focus on CiphertextPolicy Attribute-Based Encryption (CP-ABE) schemes that …-Policy Attribute-Set Based Encryption(CP-ASBE) which is the first CP-ABE scheme to (1) efficiently support naturallyoccurring compound … policy privacy. In the second part of this dissertation,we propose Policy Based Encryption System (PBES), which employs …