En_Dec

En_Dec is a tool to store files in the form of chunks.

Features

• Convert all files or specific category of files into chunks
• Encryption support
• Password protection
• Custom Chunk size

Usage

En_Dec requires python3.6.

Setup Environment

sudo apt install python3

For now, tested only on linux To encode files, use command

python3 encode.py <input_directoryname> <output_directoryname>

To decode files, use command

python3 decode.py <input_directoryname> <output_directoryname>

Flags

For encode file

• -cs <chunk_size> (in bytes. By default is 100kB i.e. 100000)
• -k (0-255 for default encryption. By default is 56)
• -f (images,videos,docs,prog. By default all files in the directory are chunked. If categories are mentioned, then only those type of files are chunked)
• -p (enable password protection. By default password protection is off)

Usage examples

Flags start with "-". If "-" is not there, it assumes it is the name of directory. Be it encoding or decoding, First such argument without "-" is considered to be name of input directory (from where files has to be read) Second such argument without "-" is considered to be name of output directory (name of directory where output is to be stored)

Usages of encode.py

By default, it expects input files in a directory named "testit".

python3 encode.py 

will encode all files in "testit" directory. You can change it by specifying the name of input directory as argument

python3 encode.py my_dir

By default, the program will put all chunks in a directory named "encrypted". Thus, the above command will encode all files from my_dir and store chunks in "encrypted" directory. You can change it by specifying the name of output directory as argument

python3 encode.py my_dir chunks_dir

will encode all files from my_dir and store chunks in chunks_dir directory.

By default, the chunk size is 100000 Bytes (100kB). You can change it using flag -cs

python3 encode.py my_dir chunks_dir -cs 1000000

By default, the project comes with a simple byte level encryption and the key for it is 56. You can change it using flag -k

python3 encode.py my_dir chunks_dir -k 75  

(Note that by default 4 Bytes are allocated in header to store the key. Store key as per your encryption algorithm. The default algo needs key between 0-255)

-f <comma seperated list. Possible elements : images,videos,docs,prog> (consider only these kind of files to encrypt) By default, it would try to encode all the files in the directory. To encode specific types of files, you can use flag -f

python3 encode.py my_dir chunks_dir -f images 

encodes only image type of files from input directory

python3 encode.py my_dir chunks_dir -f images,videos

encodes image and video type of files from input directory (Right now, 4 categories are supported. images, videos, docs, prog. Check the formats for each category in flag_and_args.py)

By default, password protection is disabled. To enable it, use flag -p

python3 encode.py my_dir chunks_dir -p

will ask for password before encoding. And will be required while decoding. -d (print debugging statements)

While solving errors, debugging statements are useful. But not always. By default it's off. Turn debugging statements on by using flag -d

python3 encode.py my_dir chunks_dir -d

will print debugging statements while executing. By default basic warnings are shown. To supress them, use flag -sw

Note that there is no ordering for anything. Just make sure the argument for a flag is right next to it.

python3 encode.py -cs 1000000 my_dir -k 89 chunks_dir -d -p

will work.

There are some flags to make it possible to do these task with more customizations. (Not yet implemented)

• -pipc by default it is 0. (No other pipeline implemented yet)
• -enc by default it is 0. (No other mode is implemented yet. Can be used to compress or make robust storage and recovery)
• -crypt by default it is 0. (No other pipeline implemented yet. Can be used to use various encryption schemes)
• -phc by default it is 0. (No other pipeline implemented yet. Can be used to make header store other details)
• -fhc by default it is 0. (No other pipeline implemented yet. Can be used to make file header store more details)

Usages of decode.py

-d (print debugging statements) (All necessary details are included in the header itself, so that user need not remember it while decdoding)

Add your implementation or solve an issue

(Look at issues here : https://github.com/gaurav-kc/Enc_dec/issues )

(Look at TODOs here : https://github.com/gaurav-kc/Enc_dec/wiki/TODOs )

Follow the steps:

• Fork this repository
• Clone the forked repo on your computer
• Make some changes
• Make a commit on your repo
• Push the changes to your repo
• Create a pull request