一个DB Proxy，对字段名称、记录都加密，Google根据CryptDB的设计开发了Encrypted BigQuery client
仍然存在数据泄露问题
Related
- CryptDB enables most DBMS functionality with a performance overhead of under 30%
- Arx is built on top of MongoDB and reports a performance overhead of approximately 10%
- OSPIR-EXT/SisoSPIR support MySQL
- BlindSeer
References
https://github.com/CryptDB/cryptdb
http://people.csail.mit.edu/nickolai/papers/raluca-cryptdb.pdf
https://people.csail.mit.edu/nickolai/papers/popa-cryptdb-tr.pdf