6.4.1 Continued Figure 6.14 Meet-in-the-middle attack for double DES For given P and C – search only O(2^56) pairs of keys K1 and K2 at the intermediate message M Encrypt P under all 2^56 options for K1 – Denote the results by M1, M2,..., Mn Decrypt C under all 2^56 options for K2 – Denote the results by M1', M2',..., Mn'
{"Image DocumentName": "6.2.1 Continue Table 6.1 Initial and final permutation tables", "Image ImageDescription": "How to read this table? The 58th bit of input x will be the first bit of output IP(x), the 50th bit of x is the second bit of IP(x), etc. The initial and final permutations are straight P-boxes that are inverses of each other. They have no cryptography significance in DES.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}