Are there any Implementations of Secure Indexes? There are several papers about Secure Indexes, for Example "Searchable Symmetric Encryption:
Improved Definitions and Efficient Constructions" and "Secure Indexes". 

I'm trying to build a system, that uses secure indexes to store and search data. Are there any existing solutions out there which implement these types of schemes?
Cryptdb has a search component which implements techniques from this paper this might be helpful to get some insights and get started , cryptdb is open sourced code is available