This Repository contains the implementation of Privacy Preserving Keyword Searches on Remote Encrypted Data (PPSED) Protocol. The schemes implemented in this repo can be found in this paper: https://eprint.iacr.org/2004/051.pdf
- Python 3.10 or greater
- nltk
- glob
- shutil
- secrets
PPSED-Implementation
├───Scheme1
│ ├───user
│ ├───server
│ └───Scheme1 related files
├───Scheme2
│ ├───user
│ ├───user_mobile
│ ├───server
│ └───Scheme2 related files
├───SecureUpdate
│ ├───user
│ ├───server
│ └───SecureUpdate related files
├───file_decryption.py
├───file_encryption.py
├───README.md
├───one_time_pad.py
└───pseudo_random.py
In scheme 1, scheme 2, and secure update files present in the user directory represent the files present in the user computer. Similarly, files present in the server directory represent the files present in the server device. In scheme 2 the files present in the user_mobile device represent the files present in the user's mobile device.
All three schemes follow the same procedure of encryption of plain text to cipher text where the plain text files are encrypted and sent to the Server. Then the retrieval algorithm is run where files containing the keyword are retrieved either to the user directory(for scheme 1 and secure update) or user_mobile directory(Scheme 2). These retrieved files can be decrypted using the decryption algorithm.
To run the encrytion code for Scheme 1, run the following command:
cd Scheme1/
python3 encryption.pyThe files to be encrypted must be present in the user directory. Enter the path of the file to be encrypted relative to the user directory. The following prompt pops up after running the code.
Enter File Name for Encryption: <path of the file to be encrypted relative to user directory>
Example:
Enter File Name for Encryption: 2.txt
File 1.txt is present in the user directory. Multiple files can be encrypted by running the code multiple times.
Simlarly to run encryption code for scheme 2 change directory to scheme 2 and run python3 encryption.py.
The encrypted file is present in the Server folder and the corresponding key for that file can be found in the user directory as a .key file.
To run the retrieval code for any scheme change directory to that scheme folder then run the following command:
python3 retrieval.pyThe following prompt pops up after running the code.
Enter Keyword: <keyword to be searched>
Example:
Enter Keyword: work
Output:
Enter Keyword: work
Retrieved file 2.enc
Retrieved file 3.enc
For scheme 1 and secure update these files will be retrieved to the user directory. For scheme 2 these files will be retrieved to the user_mobile directory.
To run the decryption code for any scheme change directory to that scheme folder and ensure that for scheme 1 and secure update the files are present in user directory whereas for scheme 3 they are present in the user_mobile directory. Also make sure that the key for the file is present in the folder as .key file. Run the following command:
python3 decryption.pyThe following prompt pops up in running the code.
Enter File Name for Decryption: <path of the file to be decrypted relative to user directory>
Example:
Enter File Name for Decryption: 2.enc
This will use the contents of 2.key as the key to decrypt the file 2.enc.
Words can be added to the key word dictionary present in user/word_indices.json for each scheme. Maximum size of the keyword dictinoary can be changed by changing the parameter imports_and_libraries.py present in each scheme folder. The maximum number of keywords supported for parameter
To reset the folder to the original state where none of the files are encypted and the server folder is empty, run the following command:
python3 clean.py