Q.4 Given the speed of current ordinary computer, estimate the amount of time ne

Question

Q.4 Given the speed of current ordinary computer, estimate the amount of time necessary to crack a DES encryption by testing all 2 * possible keys. Make a similar estimate for a 128-bit AES key. Use below instruction for this question 56 Go to web site https://www.cryptool.org/en/home and download CrypTool 1.4.31 Beta 06- English version Encrypt any text with DES-CBC with any key that you select go to analysis select symmetric encryption (modern) select DES-CBC start the Brute Force analysis. . . What is the estimated time? Do the same things for AES algorithm. NOTE. Please watch DES and AES animation in this tool kit. (under Indiv. Procedures, select visualization of algorithms)

Explanation / Answer

we have to find per second how many keys are needed.

After you could divide 2 power 56 by this found value.

From this you could able to find the estimated time.

for example:

i have taken the text as below

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This window is used to display documents which consist of normal text (with no non-displayable special characters). In such a document text can also be searched and replaced

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i got the estimated time as 4.2e+004 years DES

i got the estimated time as 2.4e+025 years AES

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