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Category > Computer Science Posted 24 Apr 2017 My Price 10.00

Consider the 3-bit block cipher

Consider the 3-bit block cipher in Table 8.1. Suppose the plaintext is 100100100. (a) Initially assume that CBC is not used. What is the resulting cipher text? (b) Suppose Trudy sniffs the cipher text. Assuming she knows that a 3-bit block cipher without CBC is being employed (but doesn’t know the specific cipher), what can she surmise? (c) Now suppose that CBC is used with IV = 111. What is the resulting cipher text?

Table 8.1

Answers

Alpha Geek
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Status NEW Posted 24 Apr 2017 04:04 PM My Price 10.00

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file 1493053127-Answer.docx preview (120 words )
C-----------ons-----------ide-----------r t-----------he -----------3-b-----------it -----------blo-----------ck -----------cip-----------her----------- in----------- Ta-----------ble----------- 8.-----------1. -----------Sup-----------pos-----------e t-----------he -----------pla-----------int-----------ext----------- is----------- 10-----------010-----------010-----------0. -----------(a)----------- In-----------iti-----------all-----------y a-----------ssu-----------me -----------tha-----------t C-----------BC -----------is -----------not----------- us-----------ed.----------- Wh-----------at -----------is -----------the----------- re-----------sul-----------tin-----------g c-----------iph-----------er -----------tex-----------t? -----------(b)----------- Su-----------ppo-----------se -----------Tru-----------dy -----------sni-----------ffs----------- th-----------e c-----------iph-----------er -----------tex-----------t. -----------Ass-----------umi-----------ng -----------she----------- kn-----------ows----------- th-----------at -----------a 3------------bi-----------t b-----------loc-----------k c-----------iph-----------er -----------wit-----------hou-----------t C-----------BC -----------is -----------bei-----------ng -----------emp-----------loy-----------ed -----------(bu-----------t d-----------oes-----------nâ€-----------™t -----------kno-----------w t-----------he -----------spe-----------cif-----------ic -----------cip-----------her-----------), -----------wha-----------t c-----------an -----------she----------- su-----------rmi-----------se?----------- (c-----------) N-----------ow -----------sup-----------pos-----------e t-----------hat----------- CB-----------C i-----------s u-----------sed----------- wi-----------th -----------IV -----------= 1-----------11.----------- Wh-----------at -----------is -----------the----------- re-----------sul-----------tin-----------g c-----------iph-----------er -----------tex-----------t? ----------- Ta-----------ble-----------
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