Question

Question 1.

XOR Challenge 1: The key is a single digit

1. Decrypt the cipher = snw{fzs
2. Decrypt the cipher = kquht}

Answer 1

Note:

The code used for decryption is written in python

Explanation:

The first encrypted text is "snw{fzs".

When the decryption is started using digits 0-9, the possible decrypted texts are as below:

As we can see, when the key is 6, the decrypted text is EXAMPLE which is the only readable decrypted text found.

So when the encrypted text "snw{fzs" is decrypted with the key as 6, the decrypted text is "EXAMPLE" which is the answer.

The first encrypted text is "kquht}".

When the decryption is started using digits 0-9, the possible decrypted texts are as below:

As we can see, when the key is 8, the decrypted text is SIMPLE which is the only readable decrypted text found.

So when the encrypted text "kquht}" is decrypted with the key as 8, the decrypted text is "SIMPLE" which is the answer.

Code used for decryption:

# This function calculates the every possible decryption using single digits on the given text

def all_decrypt_possibilities(text):

    # Iterating over single digits

    for num in range(10):

        # Converting the digit into string

        str_num = str(num)

        # Calculating xor of the ascii number of the number and every character in the string and finding then it's character equivalent of the xor value

        # Then joining every character into a string

        decrypted_data = ''.join(chr(ord(ch)^ord(str_num)) for ch in encrypted_text)

        # Printing the data

        print("Encrypted text: {} Key: {} Decrypted text: {}".format(text,num,decrypted_data))

# This is a list of encrypted texts

encrypted_texts = ["snw{fzs","kquht}"]

# Iterating over every encrypted text

for encrypted_text in encrypted_texts:

    # Printing the possibilities

    all_decrypt_possibilities(encrypted_text)

    # Printing a new line

    print("")

Code screenshot: