Android application that gets a request from a server and then encrypts the specified directory on the SD card. Also will display files and folders from the SD Card, and will allow you to encrypt/decrypt files from the app itself.

Client

• Client chooses folders to encrypt and sends over to the server
• Client does the encryption on the device after sending folders over to server
  • Encrypted files are denoted with a ".encrypted" ending ( this can be changed later )
  • Encryption is done by compressing the folder and then encrypting the zip. Decryption is done the same (decrypting and then unzipping).
• Client can also decrypt on the device. Just choose folders that are

Server

• Recieves folders from Client in string form.
• Gives Client acknowledgement that it has been recieved.

• Encryption does not get rid of the old files, i.e. unencrypted file and zipped
• Salt is the same for every user
• Server does not keep a record of the folders the user wants to keep encrypted.
• No web service to actually send a message to the device.