STOI

This tool allows to encode and hide string within pixel RGB values in images.

Build and CLI setup

To build and start using application as a cli do following steps:

• npm install
• npm run build or tsc
• npm link
• stoi

CLI Usage

There are 3 modes of this program:

1. Mode keygen - generates public key used to encrypt and decrypt text from images using provided secret: How to run it:

stoi --mode keygen --secret YOUR_SECRET_HERE --boundary WIDTH_OF_KEYxHEIGHT_OF_KEY --publicKeyOut PATH_WHERE_TO_SAVE_A_KEY

--secret - secret string to that will be used to encrypt the public key
--boundary - NUMBERxNUMBER string indicating boundaryies where encrypted string will be hidden (Must be smaller than image that will be used to hide text resolution)
--publicKeyOut - path where to save publicKeyOut

2. Mode hide - hides text within provided image using public key and secret How to run it:

stoi --mode hide --text YOUR_TEXT_TO_ECRYPT --imagePath PATH_TO_IMAGE_THAT_WILL_BE_USED_TO_ENCRYPTION --imageOutPath OUT_PUT_IMAGE_PATH --keyPath YOUR_PUBLIC_KEY_PATH --secret SECRET_THAT_WAS_USED_TO_CREATE_KEY

--text - text to encrypt in image
--imagePath - path to image that you want to use encrypt text in
--imageOutPath - output image path, if not provided by default it will be './encrypted.png'
--secret - secret string to that was used to encrypt the public key
--keyPath - path of public key

3. Mode find - finds text within provided image using public key and secret How to run it:

stoi ---mode find --imagePath ENCRYPTED_IMAGE_PATH --keyPath YOUR_PUBLIC_KEY_PATH --secret SECRET_THAT_WAS_USED_TO_CREATE_KEY --textOut PATH_FOR_SAVING_ENCRYPTED_TEXT

--imagePath - path to encrypted image
--secret - secret string to that was used to encrypt the public key
--keyPath - path of public key
--textOut - output path where encrypted text will be sent. If not set program will just print text in console.

CLI Usage examples:

Adam@DESKTOP-DODLFR3 MINGW64 ~/Desktop/testDirectory
$ stoi --mode keygen --boundary 100x100 --publicKeyOut "./keys/pk.txt" --secret julka
Program execution completed
Status: OK
Details: Key generated, saved to location ./keys/pk.txt


Adam@DESKTOP-DODLFR3 MINGW64 ~/Desktop/testDirectory
$ stoi --mode hide --text "test text lala la la" --imagePath "./in/kot.jpeg" --imageOutPath "./out/encrypted.png" --secret julka --keyPath "./keys/pk.txt"
Program execution completed
Status: OK
Details: Text encrypted and save to ./out/encrypted.png


Adam@DESKTOP-DODLFR3 MINGW64 ~/Desktop/testDirectory
$ stoi --mode find --textOut "./out/decrypted.txt" --imagePath "./out/encrypted.png" --secret julka --keyPath "./keys/pk.txt"
Program execution completed
Status: OK
Details: Text decrypted from image: test text lala la la