Encrypt Image using Python

Situatie

Encryption

It is nothing but a simple process in which we convert our data or information into secret code to prevent it from unauthorized access and keep it private and secure.

First, we will select an image, and then we will convert that image into a byte array due to which the image data will be totally converted into numeric form, and then we can easily apply the XOR operation to it. Now, whenever we will apply the XOR function on each value of the byte array then the data will be changed due to which we will be unable to access it. But we should remember one thing here our encryption key plays a very important role without that key we can not decrypt our image. It acts as a password to decrypt it.

Solutie

Pasi de urmat

# Assign values
data = 1281
key = 27

# Display values
print(‘Original Data:’, data)
print(‘Key:’, key)

# Encryption
data = data ^ key
print(‘After Encryption:’, data)

# Decryption
data = data ^ key
print(‘After Decryption:’, data)

Output:

Original Data: 1281
Key: 27
After Encryption: 1306
After Decryption: 1281

Here in the above program, as we can see how XOR operation works, it takes two variables data and a key, whenever we perform XOR operation on them for the first time we get encrypted data. Then when we perform the XOR operation between our data and key again, we get the same value as our input variable data (decrypted data). The same logic will be applicable to a byte array of Images during encryption and decryption.

# try block to handle exception

try:

# take path of image as a input

path = input(r’Enter path of Image : ‘)

# taking encryption key as input

key = int(input(‘Enter Key for encryption of Image : ‘))

# print path of image file and encryption key that

# we are using

print(‘The path of file : ‘, path)

print(‘Key for encryption : ‘, key)

# open file for reading purpose

fin = open(path, ‘rb’)

# storing image data in variable “image”

image = fin.read()

fin.close()

# converting image into byte array to

# perform encryption easily on numeric data

image = bytearray(image)

# performing XOR operation on each value of bytearray

for index, values in enumerate(image):

image[index] = values ^ key

# opening file for writing purpose

fin = open(path, ‘wb’)

# writing encrypted data in image

fin.write(image)

fin.close()

print(‘Encryption Done…’)

except Exception:

print(‘Error caught : ‘, Exception.__name__)

Output:

Enter path of Image : C:\Users\lenovo\Pictures\Instagram\enc.png
Enter Key for encryption of Image : 22
The path of file :  C:\Users\lenovo\Pictures\Instagram\enc.png
Key for encryption :  22
Encryption done...

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