Our paper on Balancing Image Privacy and Usability with Thumbnail-Preserving Encryption has been accepted at NDSS 2020. The implementation is available at osucybersec/tpe-demo
TL;DR: We propose a new encryption scheme that can encrypt images while preserving their thumbnails. This enables users to browse their encrypted images without having to decrypt them first. This can be used with existing cloud photo storage services like Google Photos.