Issue with short encryption key size

[luchua-bc]

Hi @rajsankar143,

Thanks for sharing the repository and it's a nice one.

I noticed one issue - the program webbased2-alert/2. Achieving secure, universal, and fine-grained query results verification for secure search scheme over encrypted cloud data/Secure-Search/User/AES.java uses AES encryption with a 64 bit key, which is too short. The NIST recommendation is 128 bits while a lot of software are using 256 bits now.

Please consider to change the implementation.

Thanks,
@luchua-bc