Question: Go through whole content and Please answer the question that is in Bold Font. Show Vernam's maleability by changing the encryption of the next message
Go through whole content and Please answer the question that is in Bold Font.
Show Vernam's maleability by changing the encryption of the next message to flip the thousands.
Assume you know that in the attacked invoices the amount is in the bytes 11-17 (counting from 0), like in "Transfer: $ 1000.".
The ciphertext in hexadecimal is "4462415e33360502bab430110070604e0a".
(If it contains something like "Transfer: $ 1000.", after your attack it should contain "Transfer $2000.").
You can test as:
echo 'Transfer:$ 1000.' | ./vernam_encrypt "10-10-20-30-40-50-60-70-80-90-a0-b0-c0-d0-e0-f0-00-"| ./vernam_encrypt "00-00-00-00-00-00-00-00-00-00-00-03-00-00-00-00-00-" | ./vernam_decrypt "10-10-20-30-40-50-60-70-80-90-a0-b0-c0-d0-e0-f0-00-"
Now what is the ciphertext that would result in a transfer of $10000?
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