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What is a practical method of finding a triple of keys that maps a given plain text to a given cipher text using EDE?
Wiki User
∙ 14y ago
c = ek1(dk2(ek3(p)) dk1(c)= dk2(ek3(p)) If you decrypt c with a random key and store in a table of size n Try k2 and k3 and see if the result is in the table. If the result is in the table you are done. 64 bit text resulting in a 64 bit cipher The probability of it being in the table is n/264 The number of trials is 264/n Larger storage n => Less trials n = 232 => 232 trials
Solution By:
Raj Jain Washington University in St. Louis 6-34
Posted By Qasim Siddique Department of Computer Science FUIEMS
Wiki User
∙ 14y ago
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