
days-ex

guptalekhanshastrat, days-ex (kinwa desx) haah days (deta encryption manak) samamiteey-qee block sayfarvaril eka prakar aahe jyacha uddesh broot-force hallyachi jatilata vadhavane haah aahe. guntagunt vadhavanyasathi vaparlya jaanarya tantrala 'qee whitening' mhanatat.
mool days algoridam 1976 madhye 56-biit qee aakarasah nirdisht karnyat aala hotah kisathi 256 shakyata. vyapak shodh mothya sarkaranchya, visheshtah amerikechya rashtriy suraksha sansthechya (aine. ess. aii.) kshamatet asoo shakato ashee teeka jhaali hotee. algoridammadhe lakshaniy badal naan karata descha mukhya aakar vadhavanyachi eka yojana days-ex hotee, jee meey 1984 madhye ronn revestne prastavit kelee hotee.
1980 chya dashakachya uttaradhapasun haah algoridam aar. ess. aii. securitychya bii. ess. aii. eff. cryptographic librarit samavisht karnyat aala aahe.
days' lagoo karnyapurvi sadhya majkurat atirikt 64 biit qee (keey1) exore karoon aanee nantar 'encryption' nantar aanakhi 64 biit qee (keey2) exore karoon 'days-ex' vadhavteh
sootra _ 1
tyamule killicha aakar 56 + (2 × 64) = 184 bitsparyant vadhavala jaato.
tathapi, prabhavi killicha aakar (suraksha) fakt 56+64 −1 − "lb (m)" = 119 − "lb (m)" = ~ 119 bitsparyant vadhavala jaato, jethe "m" hii nivadalelya sadhya majkurachya/sanketik majkurachya jodyanchi sankhya aahe jee virodhak midvu shakato aanee "lb" haah dviaadhari laghuganak darshavito. shivay, dnyat saada majkoor aanee pragat slide attackcha vapar karoon kalincha aakar 88 bitsparyant khalee yeto.
jaree broot force atackchya babatit sudharana khoopach qamee asali taree, days-ex heey vibhedak gupt vishleshan aanee rekheey gupt vishleshnaviruddhachya 'days' chee takad dekhil vadhavate. assa andaj aahe qee vibhedak gupt-vishleshanasathi 261 nivadalele sadhe majkoor (viruddha. 247), tarr resheey gupt-vishleshanasathi 260 dnyat sadhya majkurachi aavashyakta asel (viruddha. swatantra up-killisah deskarita 243 kinwa deskarita 261.) lakshat ghya qee sampoorn sanketik sanketik pustika upalabdh hott asatana 264 sadhya aksharansah (yaa prakaranat samaan mhanoon olakhale kinwa nivadle gele), days (kinwa kharokhar 64 biit block aakarasah itar konatehi block sanketik sanketik) purnapane tutalele asate.
jaree vibhedak aanee resheey halle asale taree, sadhya days-ex varr sarvottam hallah haah dnyat-spasht-majkoor slide hallah aahe.
biryukov-wagnerne shodhala jyamadhye dnyat sadhya majkurachi jatilata aanee vishleshanachi vel aahe. shivay, tyach deta guntaguntisaha aanee 295 offline velechya guntaguntisaha, hallyache sahajpane keval sanketik majkoor-hallyat rupantar kele jaate.