Cryptographically enforced access control for user data in untrusted clouds

FYF Wang - 2016 - dspace.mit.edu
2016dspace.mit.edu
Modern web services rob users of low-level control over cloud storage; a user's single
logical data set is scattered across multiple storage silos whose access controls are set by
the web services, not users. The result is that users lack the ultimate authority to determine
how their data is shared with other web services. In this thesis, we introduce Sieve, a new
architecture for selectively exposing user data to third party web services in a provably
secure manner. Sieve starts with a user-centric storage model: each user uploads encrypted …
Modern web services rob users of low-level control over cloud storage; a user's single logical data set is scattered across multiple storage silos whose access controls are set by the web services, not users. The result is that users lack the ultimate authority to determine how their data is shared with other web services. In this thesis, we introduce Sieve, a new architecture for selectively exposing user data to third party web services in a provably secure manner. Sieve starts with a user-centric storage model: each user uploads encrypted data to a single cloud store, and by default, only the user knows the decryption keys. Given this storage model, Sieve defines an infrastructure to support rich, legacy web applications. Using attribute-based encryption, Sieve allows users to define intuitive, understandable access policies that are cryptographically enforceable. Using key homomorphism, Sieve can re-encrypt user data on storage providers in situ, revoking decryption keys from web services without revealing new ones to the storage provider. Using secret sharing and two-factor authentication, Sieve protects against the loss of user devices like smartphones and laptops. The result is that users can enjoy rich, legacy web applications, while benefiting from cryptographically strong controls over what data the services can access.
dspace.mit.edu
以上显示的是最相近的搜索结果。 查看全部搜索结果