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CAST 128 abo CAST5 v kriptografiyi blochnij algoritm simetrichnogo shifruvannya na osnovi merezhi Fejstelya yakij vikoristovuyetsya v cilomu ryadi produktiv kriptografichnogo zahistu zokrema deyakih versiyah PGP i GPG i krim togo shvaleno dlya vikoristannya Kanadskim uryadom CAST 128ZagalniRozrobnikiKarlajl Adams Stafford TavaresUpershe oprilyudnenij1996 rikPov yazanij zMerezha FejstelyaDetali shifruRozmir klyucha40 128 bitRozmir bloku64 bitRaundiv12 16 pri klyuchi gt 80 bit Div takozh CAST 256Osnovni vidomostiAlgoritm buv stvorenij v 1996 roci Karlajlom Adamsom Carlisle Adams i Staffordom Tavaresom Stafford Tavares vikoristovuyuchi metod pobudovi shifriv CAST yakij vikoristovuyetsya takozh inshim yihnim algoritmom CAST 256 algoritm kandidat AES CAST 128 skladayetsya z 12 abo 16 raundiv merezhi Fejstelya z rozmirom bloku 64 bita i dovzhinoyu klyucha vid 40 do 128 bit ale tilki z inkrementaciyeyu po 8 bit 16 raundiv vikoristovuyutsya koli rozmiri klyucha perevishuyut 80 bit V algoritmi vikoristovuyutsya 8x16 S bloki zasnovani na bent funkciyi operaciyi XOR i modulyarnij arifmetici modulyarnoe dodavannya i vidnimannya Ye tri riznih tipi funkcij raundiv ale voni shozhi za strukturoyu i rozriznyayutsya tilki u vibori vikonuvanoyi operaciyi dodavannya vidnimannya abo XOR v riznih miscyah Hocha CAST 128 zahishenij patentom jogo mozhna vikoristovuvati u vsomu sviti dlya komercijnih abo nekomercijnih cilej bezkoshtovno OpisCAST ce populyarnij 64 bitovij shifr dopuskaye rozmiri klyucha azh do 128 bit yakij buv rozroblenij v Kanadi Karlajlom Adamsom Carlisle Adams i Staffordom Tavaresom Stafford Tavares Avtori stverdzhuyut sho nazva obumovlena hodom rozrobki i povinno nagaduvati pro imovirnisnij harakter procesu a ne pro iniciali avtoriv Algoritm CAST vikoristovuye 64 bitovij blok i 64 bitovij klyuch CAST stijkij do diferencialnogo i linijnogo kriptoanalizu Sila algoritmu CAST ukladena v jogo S blokah U CAST nemaye fiksovanih S blokiv i dlya kozhnogo dodatka voni konstruyuyutsya zanovo Stvorenij dlya konkretnoyi realizaciyi CAST S blok vzhe bilshe nikoli ne zminyuyetsya Inshimi slovami S bloki zalezhat vid realizaciyi a ne vid klyucha Northern Telecom vikoristovuye CAST u svoyemu paketi program Entrust dlya komp yuteriv Macintosh PC i robochih stancij UNIX Obrani nimi S bloki ne opublikovani sho vtim ne divno CAST 128 nalezhit kompaniyi Entrust Technologies ale ye bezkoshtovnim yak dlya komercijnogo tak i dlya nekomercijnogo vikoristannya CAST 256 dostupne bezkoshtovne rozshirennya CAST 128 yake prijmaye rozmir klyucha 256 bit i maye rozmir bloku 128 bit CAST 256 buv odnim z pershih kandidativ na AES Opis algoritmuCAST 128 zasnovanij na merezhi Fejstelya Povnij algoritm shifruvannya vikladeno v nastupnih chotiroh krokiv VHID tekst m1 m64 klyuch K k1 k128 VIHID zashifrovanij tekst c1 C64 1 rozgortka klyucha stanovit 16 par pidklyuchiv Kmi Kri otrimanih z K div rozdili Pari raundovih klyuchiv i Neidentichni raundi 2 L0 R0 lt m1 m64 Podilyaye tekst na livu i pravu 32 bitni polovini L0 m1 m32 i R0 m33 m64 3 16 raundiv for i from 1 to 16 obchisliti Li i Ri nastupnim chinom Li Ri 1 Ri Li 1 F Ri 1 Kmi Kri de F viznachena v rozdili Pari raundovih klyuchiv F maye tip 1 tip 2 tip 3 abo v zalezhnosti vid i 4 c1 c64 lt R16 L16 Minyayemo ostatochni bloki miscyami L16 R16 i ob yednuyemo shob sformuvati zashifrovanij tekst Rozshifruvannya zbigayetsya z algoritmom shifruvannya navedenim vishe krim togo sho raundi i otzhe pari pidklyuchiv vikoristovuyutsya v zvorotnomu poryadku shob obchisliti L0 R0 z R16 L16 Pari raundovih klyuchivCAST 128 vikoristovuye paru pidklyuchiv za raund 32 bitni velichini Km vikoristovuyetsya v yakosti maskuvannya klyucha i Kr vikoristovuyut yak perestanovki klyucha z yakih vikoristovuyutsya tilki pochatkovi 5 bit Neidentichni raundiVihidna funkciya F Tri riznih tipiv funkciyi vikoristovuyutsya v CAST 128 Tipi viglyadayut nastupnim chinom de D ye vhidnimi danimi u funkciyu F i Ia Id ye najbilsh znachushij bajt najmensh znachushij bajt I vidpovidno Zvernit uvagu sho i dodavannya i vidnimannya za modulem 2 32 ye pobitovij XOR i lt lt lt ye ciklichnim zsuvom vlivo Raundi 1 4 7 10 13 16 I Kmi Ri 1 lt lt lt Kri F S1 Ia S2 Ib S3 Ic S4 Id Raundi 2 5 8 11 14 I Kmi Ri 1 lt lt lt Kri F S1 Ia S2 Ib S3 Ic S4 Id Raundi 3 6 9 12 15 I Kmi Ri 1 lt lt lt Kri F S1 Ia S2 Ib S3 Ic S4 Id Polya zaminiCAST 128 vikoristovuye visim poliv zamini polya S1 S2 S3 i S4 raundovi funkciyi poliv zamini S5 S6 S7 i S8 ye klyuchami rozgortki poliv zamini Nezvazhayuchi na te sho 8 poliv zamini vimagayut u zagalnij skladnosti 8 Kbajt dlya zberigannya zvernit uvagu na te sho tilki 4 Kbajta potribni pid chas faktichnogo shifruvannya deshifruvannya tak yak generaciya pidklyucha zazvichaj robitsya do bud yakogo vvedennya danih Divis dodatok dlya vmistu poliv zamini S1 S8 Klyuchi rozgortkiUyavimo 128 bitnij klyuch u viglyadi x0x1x2x3x4x5x6x7x8x9xAxBxCxDxExF de x0 starshij bajt i xF molodshij bajt Uyavimo z0 zF promizhnimi timchasovimi bajtami Si yavlyaye pole zamini i i predstavlyaye dodavannya po XOR Polya zamini formuyutsya z klyucha x0x1x2x3x4x5x6x7x8x9xAxBxCxDxExF nastupnim chinom z0z1z2z3 x0x1x2x3 S5 xD S6 xF S7 xC S8 xE S7 x8 z4z5z6z7 x8x9xAxB S5 z0 S6 z2 S7 z1 S8 z3 S8 xA z8z9zAzB xCxDxExF S5 z7 S6 z6 S7 z5 S8 z4 S5 x9 zCzDzEzF x4x5x6x7 S5 zA S6 z9 S7 zB S8 z8 S6 xB K1 S5 z8 S6 z9 S7 z7 S8 z6 S5 z2 K2 S5 zA S6 zB S7 z5 S8 z4 S6 z6 K3 S5 zC S6 zD S7 z3 S8 z2 S7 z9 K4 S5 zE S6 zF S7 z1 S8 z0 S8 zC x0x1x2x3 z8z9zAzB S5 z5 S6 z7 S7 z4 S8 z6 S7 z0 x4x5x6x7 z0z1z2z3 S5 x0 S6 x2 S7 x1 S8 x3 S8 z2 x8x9xAxB z4z5z6z7 S5 x7 S6 x6 S7 x5 S8 x4 S5 z1 xCxDxExF zCzDzEzF S5 xA S6 x9 S7 xB S8 x8 S6 z3 K5 S5 x3 S6 x2 S7 xC S8 xD S5 x8 K6 S5 x1 S6 x0 S7 xE S8 xF S6 xD K7 S5 x7 S6 x6 S7 x8 S8 x9 S7 x3 K8 S5 x5 S6 x4 S7 xA S8 xB S8 x7 z0z1z2z3 x0x1x2x3 S5 xD S6 xF S7 xC S8 xE S7 x8 z4z5z6z7 x8x9xAxB S5 z0 S6 z2 S7 z1 S8 z3 S8 xA z8z9zAzB xCxDxExF S5 z7 S6 z6 S7 z5 S8 z4 S5 x9 zCzDzEzF x4x5x6x7 S5 zA S6 z9 S7 zB S8 z8 S6 xB K9 S5 z3 S6 z2 S7 zC S8 zD S5 z9 K10 S5 z1 S6 z0 S7 zE S8 zF S6 zC K11 S5 z7 S6 z6 S7 z8 S8 z9 S7 z2 K12 S5 z5 S6 z4 S7 zA S8 zB S8 z6 x0x1x2x3 z8z9zAzB S5 z5 S6 z7 S7 z4 S8 z6 S7 z0 x4x5x6x7 z0z1z2z3 S5 x0 S6 x2 S7 x1 S8 x3 S8 z2 x8x9xAxB z4z5z6z7 S5 x7 S6 x6 S7 x5 S8 x4 S5 z1 xCxDxExF zCzDzEzF S5 xA S6 x9 S7 xB S8 x8 S6 z3 K13 S5 x8 S6 x9 S7 x7 S8 x6 S5 x3 K14 S5 xA S6 xB S7 x5 S8 x4 S6 x7 K15 S5 xC S6 xD S7 x3 S8 x2 S7 x8 K16 S5 xE S6 xF S7 x1 S8 x0 S8 xD Polovina sho zalishayetsya identichna tij sho dana vishe prodovzhennya vid ostannogo stvorilo x0 xF shob generuvati klyuchi K17 K32 z0z1z2z3 x0x1x2x3 S5 xD S6 xF S7 xC S8 xE S7 x8 z4z5z6z7 x8x9xAxB S5 z0 S6 z2 S7 z1 S8 z3 S8 xA z8z9zAzB xCxDxExF S5 z7 S6 z6 S7 z5 S8 z4 S5 x9 zCzDzEzF x4x5x6x7 S5 zA S6 z9 S7 zB S8 z8 S6 xB K17 S5 z8 S6 z9 S7 z7 S8 z6 S5 z2 K18 S5 zA S6 zB S7 z5 S8 z4 S6 z6 K19 S5 zC S6 zD S7 z3 S8 z2 S7 z9 K20 S5 zE S6 zF S7 z1 S8 z0 S8 zC x0x1x2x3 z8z9zAzB S5 z5 S6 z7 S7 z4 S8 z6 S7 z0 x4x5x6x7 z0z1z2z3 S5 x0 S6 x2 S7 x1 S8 x3 S8 z2 x8x9xAxB z4z5z6z7 S5 x7 S6 x6 S7 x5 S8 x4 S5 z1 xCxDxExF zCzDzEzF S5 xA S6 x9 S7 xB S8 x8 S6 z3 K21 S5 x3 S6 x2 S7 xC S8 xD S5 x8 K22 S5 x1 S6 x0 S7 xE S8 xF S6 xD K23 S5 x7 S6 x6 S7 x8 S8 x9 S7 x3 K24 S5 x5 S6 x4 S7 xA S8 xB S8 x7 z0z1z2z3 x0x1x2x3 S5 xD S6 xF S7 xC S8 xE S7 x8 z4z5z6z7 x8x9xAxB S5 z0 S6 z2 S7 z1 S8 z3 S8 xA z8z9zAzB xCxDxExF S5 z7 S6 z6 S7 z5 S8 z4 S5 x9 zCzDzEzF x4x5x6x7 S5 zA S6 z9 S7 zB S8 z8 S6 xB K25 S5 z3 S6 z2 S7 zC S8 zD S5 z9 K26 S5 z1 S6 z0 S7 zE S8 zF S6 zC K27 S5 z7 S6 z6 S7 z8 S8 z9 S7 z2 K28 S5 z5 S6 z4 S7 zA S8 zB S8 z6 x0x1x2x3 z8z9zAzB S5 z5 S6 z7 S7 z4 S8 z6 S7 z0 x4x5x6x7 z0z1z2z3 S5 x0 S6 x2 S7 x1 S8 x3 S8 z2 x8x9xAxB z4z5z6z7 S5 x7 S6 x6 S7 x5 S8 x4 S5 z1 xCxDxExF zCzDzEzF S5 xA S6 x9 S7 xB S8 x8 S6 z3 K29 S5 x8 S6 x9 S7 x7 S8 x6 S5 x3 K30 S5 xA S6 xB S7 x5 S8 x4 S6 x7 K31 S5 xC S6 xD S7 x3 S8 x2 S7 x8 K32 S5 xE S6 xF S7 x1 S8 x0 S8 xD Maskuvannya i perestanovka pidklyuchivKm1 Km16 32 rozryadni pidklyuchi maskuvannya odin raund Kr1 Kr16 32 rozryadni perestanovki pidklyuchiv odin raund tilki molodshi 5 bitiv vikoristovuyutsya v kozhnomu raundi for i 1 i lt 16 i Kmi Ki Kri K16 i Zminnij rozmir klyuchaCAST 128 Algoritm shifruvannya buv rozroblenij shob rozmir klyucha mig variyuvatisya vid 40 do 128 bit v 8 bitnomu kroci tobto dopustimi rozmiri klyucha dorivnyuyut 40 48 56 64 112 120 i 128 bit Dlya zminnoyi roboti rozmiru klyucha specifikaciya nastupni 1 Dlya rozmiriv klyucha do i vklyuchayuchi 80 bitiv tobto 40 48 56 64 72 i 80 bitiv algoritm tochno takij zhe ale vikoristovuye 12 raundiv zamist 16 2 Dlya rozmiriv klyucha bilshe nizh 80 bitiv algoritm vikoristovuye povni 16 raundiv 3 Dlya rozmiriv klyucha menshe nizh 128 bit klyuch dopovneno nulovimi bajtami v samih pravih abo molodshih poziciyah do 128 bitam tak yak rozklad klyucha CAST 128 prijmaye vhidnij klyucha 128 bit Dodatok Polya zaminiS Box S1S1 30fb40d4 9fa0ff0b 6beccd2f 3f258c7a 1e213f2f 9c004dd3 6003e540 cf9fc949bfd4af27 88bbbdb5 e2034090 98d09675 6e63a0e0 15c361d2 c2e7661d 22d4ff8e28683b6f c07fd059 ff2379c8 775f50e2 43c340d3 df2f8656 887ca41a a2d2bd2da1c9e0d6 346c4819 61b76d87 22540f2f 2abe32e1 aa54166b 22568e3a a2d341d066db40c8 a784392f 004dff2f 2db9d2de 97943fac 4a97c1d8 527644b7 b5f437a7b82cbaef d751d159 6ff7f0ed 5a097a1f 827b68d0 90ecf52e 22b0c054 bc8e59354b6d2f7f 50bb64a2 d2664910 bee5812d b7332290 e93b159f b48ee411 4bff345dfd45c240 ad31973f c4f6d02e 55fc8165 d5b1caad a1ac2dae a2d4b76d c19b0c50882240f2 0c6e4f38 a4e4bfd7 4f5ba272 564c1d2f c59c5319 b949e354 b04669feb1b6ab8a c71358dd 6385c545 110f935d 57538ad5 6a390493 e63d37e0 2a54f6b33a787d5f 6276a0b5 19a6fcdf 7a42206a 29f9d4d5 f61b1891 bb72275e aa50816738901091 c6b505eb 84c7cb8c 2ad75a0f 874a1427 a2d1936b 2ad286af aa56d291d7894360 425c750d 93b39e26 187184c9 6c00b32d 73e2bb14 a0bebc3c 5462377964459eab 3f328b82 7718cf82 59a2cea6 04ee002e 89fe78e6 3fab0950 325ff6c281383f05 6963c5c8 76cb5ad6 d49974c9 ca180dcf 380782d5 c7fa5cf6 8ac3151135e79e13 47da91d0 f40f9086 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381b7298 f5d2f4db ab838653 6e2f1e23 83719c9ebd91e046 9a56456e dc39200c 20c8c571 962bda1c e1e696ff b141ab08 7cca89b91a69e783 02cc4843 a2f7c579 429ef47d 427b169c 5ac9f049 dd8f0f00 5c8165bf S Box S2S2 1f201094 ef0ba75b 69e3cf7e 393f4380 fe61cf7a eec5207a 55889c94 72fc0651ada7ef79 4e1d7235 d55a63ce de0436ba 99c430ef 5f0c0794 18dcdb7d a1d6eff3a0b52f7b 59e83605 ee15b094 e9ffd909 dc440086 ef944459 ba83ccb3 e0c3cdfbd1da4181 3b092ab1 f997f1c1 a5e6cf7b 01420ddb e4e7ef5b 25a1ff41 e180f8061fc41080 179bee7a d37ac6a9 fe5830a4 98de8b7f 77e83f4e 79929269 24fa9f7be113c85b acc40083 d7503525 f7ea615f 62143154 0d554b63 5d681121 c866c3593d63cf73 cee234c0 d4d87e87 5c672b21 071f6181 39f7627f 361e3084 e4eb573b602f64a4 d63acd9c 1bbc4635 9e81032d 2701f50c 99847ab4 a0e3df79 ba6cf38c10843094 2537a95e f46f6ffe a1ff3b1f 208cfb6a 8f458c74 d9e0a227 4ec73a34fc884f69 3e4de8df ef0e0088 3559648d 8a45388c 1d804366 721d9bfd a58684bbe8256333 844e8212 128d8098 fed33fb4 ce280ae1 27e19ba5 d5a6c252 e49754bdc5d655dd eb667064 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e580b3e6 4e68b8f4 c5c8b37e 0d809ea2 398feb7c132a4f94 43b7950e 2fee7d1c 223613bd dd06caa2 37df932b c4248289 acf3ebc35715f6b7 ef3478dd f267616f c148cbe4 9052815e 5e410fab b48a2465 2eda7fa4e87b40e4 e98ea084 5889e9e1 efd390fc dd07d35b db485694 38d7e5b2 57720101730edebc 5b643113 94917e4f 503c2fba 646f1282 7523d24a e0779695 f9c17a8f7a5b2121 d187b896 29263a4d ba510cdf 81f47c9f ad1163ed ea7b5965 1a00726e11403092 00da6d77 4a0cdd61 ad1f4603 605bdfb0 9eedc364 22ebe6a8 cee7d28aa0e736a0 5564a6b9 10853209 c7eb8f37 2de705ca 8951570f df09822b bd691a6caa12e4f2 87451c0f e0f6a27a 3ada4819 4cf1764f 0d771c2b 67cdb156 350d83845938fa0f 42399ef3 36997b07 0e84093d 4aa93e61 8360d87b 1fa98b0c 1149382ce97625a5 0614d1b7 0e25244b 0c768347 589e8d82 0d2059d1 a466bb1e f8da0a8204f19130 ba6e4ec0 99265164 1ee7230d 50b2ad80 eaee6801 8db2a283 ea8bf59eRozshifruvannyaRozshifrovka dlya CAST 128 vidnosno prosta Rozshifruvannya pracyuye v tomu zh algoritmichnij napryamku sho j shifruvannya pochinayuchi z zashifrovanogo tekstu v yakosti vhidnih danih Pri comu pidklyuch vikoristovuyutsya v zvorotnomu napryamku PosilannyaRFC 2144 Algoritm CAST 128, Вікіпедія, Українська, Україна, книга, книги, бібліотека, стаття, читати, завантажити, безкоштовно, безкоштовно завантажити, mp3, відео, mp4, 3gp, jpg, jpeg, gif, png, малюнок, музика, пісня, фільм, книга, гра, ігри, мобільний, телефон, android, ios, apple, мобільний телефон, samsung, iphone, xiomi, xiaomi, redmi, honor, oppo, nokia, sonya, mi, ПК, web, Інтернет
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