Outline Cloud environment Security problems in cloud How to protect applications against Hypervisor/OS in cloud Intel SGX, protecting applications against OS SCONE(OSDI'16), using Intel SGX How to protect user data against applications in cloud yoan(OSDI'16), using Nacl (s&P09)and Intel SGX How to verify network security in cloud TenantGuard(NDSS'17), verifying network isolation in cloudOutline • Cloud environment & Security problems in cloud • How to protect applications against Hypervisor/OS in cloud • Intel SGX, protecting applications against OS • SCONE (OSDI’16), using Intel SGX • How to protect user data against applications in cloud • Ryoan (OSDI’16), using NaCl (S&P’09) and Intel SGX • How to verify network security in cloud • TenantGuard (NDSS’17)， verifying network isolation in cloud