Single Key Exploit

This program demonstrates the single key exploit by way of ciphertext decryption. The single key exploit has also been know to go by other names including one-time pad and many-time pad.

Table of Contents

Description
Program Output
Execution
Function Headers
Resources

Description

Single Key Exploit is a python program that decrypts ciphertext. This ciphertext has been encrypted using a single key for each message, leading to the single key exploit. Upon execution, the program will display the plaintext message that will be encrypted. Then it will try to decrypt as much of the encrypted text as possible. The resulting decrypted text will be output to the user.

Program Output

Execution

To execute run the command python3 main.py

Function Headers

display_info()

Description:

Outputs plain text to be encrypted
Parameters:

None
Return:

msgs List containing strings to be encrypted

key List of bytes representing the encryption key

make_cipher(text, key)

Description:

Creates a list of strings representing ciphertext
Parameters:

text List representing plaintext

key List of bytes representing the encryption key
Return:

cipher List containing ciphertext

encrypt(msg, key)

Description:

Encrypts plain text using an encryption key
Parameters:

mag String to be encrypted

key List representing encryption key
Return:

bytes String representing encrypted text in hexadecimal

preprocess(text)

Description:

Turns encrypted text into hexadecimal and initializes a list of dashes acting as placeholders
Parameters:

text List containing ciphertext
Return:

hex List representing hexadecimal representation of encrypted text

place_holders List containing dashes -

break_encryption(encrypted_text, decrypted_text)

Description:

Attempts to break encryption by utilizing XOR operations
Parameters:

encrypted_text List containing the ciphertext

decrypted_text List of placeholders to store decrypted text
Return:

cracked_cipher List of decrypted text

ascii_space(not_cracked, current_char, columns)

Description:

Checks a character to determine if it is a space
Parameters:

not_cracked List containing text that has not been decrypted

current_char Char representing the current character that is being test to determine if it is a space

columns Int representing the index of the current character we are testing
Return:

Bool True if a space is found, False otherwise

output_text(text)

Description:

Outputs the decrypted text
Parameters:

text List containing decrypted text
Return:

None

Resources

To learn more about this encryption vulnerability refer to this article: One-time Pad

License

cmg189/singleKey_exploit

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