
chaloo qee sipher

shastriy guptalekhnamadhye, chaloo qee sipher haah eka prakarcha bahupadi paryay sipher aahe jyamadhye samanyatah pustakatil majkoor, khoop lamb keystream pradan karnyasathi vaparla jaato. sahasa, vaparnyat yenare pustak veleaadhi manya kele jaate, tarr vaparnyat yenara parichhed pratyek sandeshasathi yadruchchikpane nivadala jaato aanee sandeshat kuthetari guptapane soochit keela jaato.
udaharanadakhal.
vaparlela majkoor 'see programming bhasha' (1978 aavrutti) aahe aanee 'tabula recta' haah zanki aahe. sadha majkoor 'ekach velee pall kadha' assa aahe.
prushth 63, ola 1 hii chaloo qee mhanoon nivadali aaheh
chuka anek thikani houu shakatat. eka label aahe...
tyanantar chaloo asaleli killi sadhya majkurat lihili jaateh
tyanantar sandesh "jeey. see. vhee. ess. aar. ell. kyu. aine. pii. ess.". mhanoon pathavala jaato. tathapi, vigenaire sayfarchya ulat, jarr sandesh vistarit keela gela asel tarr killichi punaravrutti kelee jaat nahee; killi majkoor swatach killi mhanoon vaparla jaato. jarr sandesh vistarla asel, udaharanarth, "lagech pall kadha. aamhala shodhale gele aahe, "mug chaloo asaleli killi purvipramanech suru rahateh
chaloo qee kuthe shodhayachi heey tharvanyasathi, nantar paach sanketik aksharancha banavat block jodala jaato, jyamadhye teen prushth kramank darshavtat aanee done ola kramank, a = 0, b = 1 ii. vaparoon. ankanchi sanketikaran karnyasathi. asha blockla indicator block mhanatat. pratyek sandeshacha dusra shevatcha bhag mhanoon soochak khand samavisht keela jaeel. (soochak khand lapavanyasathi itar anek yojana shakya aahet.) asha prakare prushth 63, ola 1 "agdab" (06301) mhanoon sanketikrut karate.
yamule "jeey. see. vhee. ess. aar. ell. kyu. aine. pii. ess. yaguim quauxus agdab mecto" chaa antim sandesh midato.
prakar.
chaloo qee sayfarche aadhunik prakar sahasa paramparik "tabula rectala" bitwice exclusive kinwa varnamala aksharanaivaji sampoorn biteswar karya karatat aanee tyanchya chaloo qee mothya fayalimadhun midavatat. fayalinchi kadachit jaast entropy ghanata aanee svayanchalit karnyachya sulbhatevyatirikt, asha prakar aanee paramparik paddhatinmadhye vyavharik farak qamee aahe.
kramparivartanane chaloo qee tayar kelya.
jarr konee anek prarambh nirdeshak (kinwa sanyojan niyam) vaparoon ektritpane majkoor tayar keela tarr adhik sankshipt chaloo qee vaparali jaau shakate. udaharanarth, ekach thikanahun (ekach nirdeshak) suruvat karnyaivaji, ekhadi vyakti anek prarambh nirdeshak aanee zore ekatra pravah vaparoon naveen chaloo qee tayar karoo shakate, tyachpramane vagalanyache niyam vaparale jaau shakatat. tyanantar kaay badalale jaate teey chaloo keebukchya nirdeshanchi malika aanee/kinwa prarambhik qee majkuratoon naveen krambaddha chaloo qee tayar karnyasathi niyamanchi malika aahe. (sarvajanik kall guptalekhanadware kinwa pratyakshapane yachee devanghevan kelee jaau shakate. chaloo asalele mukhya pustak naan badalata teey varanvar badalale jaau shakatat.)
sanketik paath sadha majkoor asalyache disate.
paramparik sanketik paath sadha pathapeksha khoopach vegala asalyache disate. yaa samasyeche nirakaran karnyasathi, eka prakar cyfertext output mhanoon 'plaintext' aksharanaivaji 'plaintext' shabd output karato. heey shabdanchi "varnamala" tayar karoon kele jaate (vyavharat anek shabd pratyek sanketik aksharanchya output varnanshi sambandhit asoo shakatat). parinam mhanje eka sanketik paath output jeey sadhya majkurachya shabdanchya lamb kramanusar disate (prakriya nested kelee jaau shakate). saiddhantikdrushtya, heey manak sanketik aksharancha utpadan mhanoon vapar karnyapeksha vegale nahee. tathapi, sadhya majkurat disanara sanketik pathamule 'loopmadhye asalela manus' tyacha decode kelela sadha majkoor mhanoon chukun arth lavnyacha prayatna karoo shakato.
eka udaharan bda (berkhoff deflator algoridam) asel, pratyek seifertext output varnamadhye kiman eka sandnya, kriyapad, visheshan aanee kriyavisheshan sambandhit asate. (udaa.jee. (kiman) pratyek aii. ess. see. aay. aay. varnasathi pratyeki eka). vyakarandrushtya vajvi vakye cyfertext output mhanoon tayar kelee jaatat. decryptionsathi shabdanche mapping punha aii. ess. see. aay. aay. varr karane aanee nantar chaloo qee vaparoon akshare vastavik sadhya majkurat decrypt karane aavashyak aahe. nested-bii. dii. aii. heey punarlekhan prakriyedvare anek vela utpadan chalwell, jyamule "plaintext-disanare" sanketik majkurache anek thurr tayar hotil-pratyekasathi tyachya astitvat nasalelya shabdarthik arthacha arth lavnyacha prayatna karnyasathi "human-inn-daad-loop" chee sambhavya aavashyakta asate.
gromark sipher.
gromark sipher" ("gronsfeld sipher mishra varnamala aanee chaloo keys") ankanchya salag jodya jodoon tayar keleli chaloo sankhyatmak qee vaparte.
wick sifermadhye ashach prakarcha mage gelela fibonachi generator vaparla jaato.
suraksha.
jarr chaloo asaleli killi kharokhar yadruchchik asel, kadhihi punha vaparali gelee nahee aanee gupt thewali gelee asel, tarr parinam eka velcha padd aahe, eka paddhat jee paripoorn gopaniyata pradan karate (sadhya majkurabaddal konatihi mahitee ughad karat nahee). tathapi, jarr (nehmipramane) chaloo qee haah naisargik bhashet majkuracha eka gut asel, tarr suraksha pratyakshat baryapaiki kharab hote, kaaran tyaa majkurat yadruchchik nasaleli vaishishtye asateel jee gupt vishleshanas madat karnyasathi vaparali jaau shakatat. parinami, plaintext aanee running qee yaa donhichya prati varn entropy qamee asate aanee sanyojan karya sahajpane ulate hote.
sayfarvar hallah karnyasathi, eka cryptanalist cyfertextchya bajoone sambhavya sadhya majkuracha andaj lavto, tyanna pratyek sambhavya sthanavarun vaja karato. jevha parinam ekhadya samajanyayogya goshticha eka bhag asato, tevha andajit sadha majkoor tyaa sthanasathi yogya asanyachi uchch sambhavyata asate (ektar vastavik sadha majkoor mhanoon kinwa chaloo keecha bhag mhanoon). samajanyayogya ekhadya goshticha bhag' nantar anekada donhi tokanvar vadhavala jaau shakato, asha prakare aanakhi sambhavya sadha majkoor pradan keela jaau shakato-joou pudhe vadhavala jaau shakato, aanee asech. akheris chaloo asalelya killicha srot olakhala jaanyachi aanee jig varr asanyachi shakyata aahe.
suraksha sudharanyasathi anek marg aahet. pahili aanee sarvat spasht gosht mhanje 'tabula rect' aivaji gupt mishra varnamala chitrafit vaparane. yamule kharokharach goshti khoop guntaguntichya hotat parantu too eka sampoorn upay nahee. sadhya majkurachya aanee chaloo asalelya mukhya varnanchya jodya 'qq' mhananyaivaji 'ee' sarkhya uchch varanvartechya jodya asanyachi shakyata jaast asate. yamule utpadan varanvarta vitaranas karanibhoot honara tirchha bhag, 'eae' aanee 'cukue' heey ekach sanketik aksharavar nakasha karane shakya aahe, parantu tarihi vitaran sapat nahee yaa vastusthitimule jhakala jaato. yamule guptachitra vishleshkala chitrafiticha kahee bhag shodhata yeil, nantar purvipramanech pudhe jaau shakel (parantu punarnirmit chitrafitimadhye vibhag gahal aahet asha antarasah).
dusari shakyata mhanje vishisht ingrajipeksha prati akshar adhik entropy asalela mukhya majkoor vaparane. yaa uddeshasathi, keey. jee. bii. neey agentsna panchang aanee vyapar ahwal yasarkhi kagadpatre vaparnyacha sallah deela, jyat anekada yadruchchik disana sankhyanchya lamb yadya asatat.
aanakhi eka samasya mhanje keyspace aashcharyakarakpane lahan aahe. samaja, 10 kotee mukhya majkoor aahet jeey sambhavyapane vaparale jaau shakatat aanee pratyekamadhye sarasari 11 hazar sambhavya prarambhik sthitee aahet. sambhavya mukhya granthancha prachand sangrah asalelya pratispardhyasathi, heey sootra _ 1 chya kramacha kroor shakti shodh shakya karate, jeey sanganakachya guptalekhan mankannusar tulanene sope lakshya aahe. (yaa samasyechya drushtikonasathi varr kramparivartan vyutpann chaloo qee pahaa).
gondhal.
donhi cypherni tyanchya mukhya sahityacha bhag mhanoon kadambyancha shastriy vapar kelyamule, anek srot pustakache sipher aanee chaloo asalelya qee sifermadhye gondhal ghalatat. teey kharokharach khoop durvarche sambandhit aahet. chaloo qee sipher haah eka bahupadi paryay aahe, pustak sipher haah eka samalingi paryay aahe. kadachit haah farak sarvat spashtapane yaa vastusthitivarun keela jaato qee chaloo asalela sanketik sanketik akshar yadruchchik sankhyanchya pustakasah sarvat changle kaam karel, tarr asey pustak (majkoor nasalele) pustak sanketik aksharasathi nirupayogi tharel.