對(duì)稱密匙密碼系統(tǒng)(自學(xué)了解)

1、1.2 20061.3 20061.4 20062: 0,1Fab: ab mod 20110,10011 （即0）n1 23kn2Aa a aaaFkj kkk iaj: a(mod n) , ai: a(mod n)nm22f :FF1 23knAa a aaa123hmBb b bbbhl(h)ba,l:1,2,m1,2,n而1.5 2006iKi 1i 1ii(L,R)(L ,R ) ii 1LRii 1ii 1RLf(K ,R)K00rrE (L ,R )(L ,R )1.6 200664123642Kk k kkF888i j8i jj 1j 1kk1 (mod 2)(0i7) 5

2、62720575940379279361.7 2006DES f函數(shù)1.8 20065.2 Triple DES挑戰(zhàn)DES312kkkEEE321121123KKKKKKKKK121323TripleDES-EEE3: EEETripleDES-EEE2: EEETripleDES-EEE3: EEE(KK ,KK ,KK )1.9 200612KKEElm (l1,2,k)12lKKlcEE(m ) (l1,2,k)11121KK1KK1cED(c )EE(m )12KlKlD(c )E(m )(l1,2,k)1.10 20065.3 AES0001020310111213202122233

3、0313233ssssssssSssssssss；82F82F884322t/(tttt1) FF843tttt1 i0i1i2i3ssss1.11 200682F823i0i1i2i32ss Xs Xs XXF4(mod X1)4X182XF82F00010203101112132021222330313233kkkkkkkkkkkkkkkk。1.12 20060123456789ABCDEF0637C777BF26B6FC53001672BFED7AB761CA82C97DFA5947F0ADD4A2AF9CA472C02B7FD9326363FF7CC34A5E5F171D8311530

4、4C723C31896059A071280E2EB27B275409832C1A1B6E5AA0523BD6B329E32F84553D100ED20FCB15B6ACBBE394A4C58CF6D0EFAAFB434D338545F9027F503C9FA8751A3408F929D38F5BCB6DA2110FFF3D28CD0C13EC5F974417C4A77E3D645D1973960814FDC222A908846EEB814DE5E0BDBAE0323A0A4906245CC2D3AC629195E479BE7C8376D8DD54EA96C56F4EA657AAE08CBA78

5、252E1CA6B4C6E8DD741F4BBD8B8AD703EB5664803F60E613557B986C11D9EEE1F8981169D98E949B1E87E9CE5528DFF8CA1890DBFE6426841992D0FB054BB161.13 20065.4 IDEA16/2Z Z田16(/21)Z Z16(mod 2165537) 1.14 20061.15 20061.16 20065.5 區(qū)塊密碼加密模式1.17 20061.18 20061.19 200612mm | m |jjskjj 1n sjjcmL (E (X )XR(X )|c，jjskjj 1n sjjmcL (E (X )XR(X