Determine the content of the unknown file

Assignment Help Basic Computer Science

Reference no: EM131329292

In a company, all files which are sent on the network are automatically encrypted by using AES-128 in CBC mode. A fixed key is used, and the IV is changed once per day. The network encryption is file-based, so that the IV is used at the beginning of every file. You managed to spy out the fixed AES-128 key, but do not know the recent IV. Today, you were able to eavesdrop two different files, one with unidentified content and one which is known to be an automatically generated temporary file and only contains the value 0xFF. Briefly describe how it is possible to obtain the unknown initialization vector and how you are able to determine the content of the unknown file.

Reference no: EM131329292

Questions Cloud

Calculate coupon rate and coupon yield and yield to maturity : If you calculate the coupon rate, coupon yield, and yield to maturity for this bond after the decline in interest rates, which of the three values is highest and which is lowest? Explain.

How we can perform a brute-force attack with unknown iv : Keeping the IV secret in OFB mode does not make an exhaustive key search more complex. Describe how we can perform a brute-force attack with unknown IV. What are the requirements regarding plaintext and ciphertext

Discuss your opinion on whether it is best to lease vehicle : Discuss (i.e. explain in depth) your opinion on whether it is best to lease or purchase the specific vehicle you are discussing. Keeping in mind that you may have both financial and nonfinancial considerations.

What about the ten year bonds issued five years ago : For an investor seeking a low-risk investment maturing in five years, do the bonds issued twenty-five years ago with a much higher coupon rate provide a more attractive return than the new five-year bonds?

Determine the content of the unknown file : Briefly describe how it is possible to obtain the unknown initialization vector and how you are able to determine the content of the unknown file.

Why a bonds interest rate risk is related to its maturity : Describe how and why a bond's interest rate risk is related to its maturity.- Explain why municipal bonds can offer lower interest rates than equally risky corporate bonds.

Write a narrative essay about a risk you have taken : Choose a story that was an important or memorable experience for you - Do you know someone who has taken a risk. either a personal. professional. or financial one? Write a narrative essay about this person, the risk he or she took. and the outcome.

What does the slope of the yield curve reveal : Under the expectations theory, what does the slope of the yield curve reveal about the future path of interest rates?

Review companys most recent statement of cash flows : Research one publicly traded company in which you are interested using the Internet and/or Strayer databases. Review its most recent statement of cash flows and income statement on the company Website.

User Account

All Pages