
digital oppu vyaajarekha

oru cryptographic digital signature allengil mack sisttathil, formula _ 1 nuu saadhuthayullathum ennaal niyamaanusrithamaaya oppittayal munbu srishtichittillaathumatha oru sandesham, formula _ 1, oru oppu (allengil mack), formula _ 2 enniva ulkkollunna oru jody srishtikkaanulla kazhivaanu digital signature forgery. vividha tharatthilulla vyaajarekhakalundu.
eee tharangalil oronninum suraksha nirvachanangal bandhappedutthaam. anubandha tharatthilulla vyaajarekha saadhyamallengil oru prathyeka nirvachanam prakaram oru signature skeem surakshithamaan.
tharangal.
thaazhepparayunna nirvachanangal ettavum kuranja suraksha muthal ettavum uyarnna suraksha vare, mattoru vidhathil paranjaal, ettavum sakthamaaya akramanam muthal ettavum durbalamaaya akramanam vare. nirvachanangal oru sreniye roopappeduthunnu, athaayath oru prathyeka akramanam nadatthaan kazhiyunna oru aakramanakaarikk ellah aakramanangalum pattikayil kooduthal thaazhekku nadatthaan kazhiyum. athupole, oru nischitha suraksha lakshyathilethunna oru padhathiyum munpulla ellah padhathikalilekkum athunnu.
aake edavela.
thaazhepparayunna aakramanangalekkaal pothuvaaya oru "samboornna edavela" yum undu athiraalikalkku oppidunnayaal upayogikkunna swakaarya vivarangalum thaakkolukalum veendedukkaan kazhiyumbol, avarkk eathu sandeshathilum saadhyamaaya eathu oppum srishtikkaan kazhiyum.
saarvathrika vyaajarekha (saarvathrika kshamikkaanaavaatha, yuu. yuu. eph).
eathenkilum" sandeshathinu, formula 1 enna saadhuvaaya oppu, formula 2, srishtikkunnathaanu saarvathrika vyaajarekha. saarvathrika vyaajarekha thayyarakkan kazhivulla oru ethiraaliykku avar svayam thiranjeduttha sandeshangalil (thiranjeduttha vyaajarekhayilennapole), kramarahithamayi thiranjeduttha sandeshangalil allengil oru ethiraali nalkunna nirddishta sandeshangalil polum oppidaanaakum.
selective forgery (selective forgebility, suf).
aakramanathinu munbu aakramanakaari formula _ 1 "thiranjeduttha" oru ethiraali oru sandesham/oppu jody formula _ 6 srishtikkunnathaanu selective fortery. signature algorithavumaayi bandhappett rasakaramaaya ganithashaasthra gunangalkkayi formula _ 1 thiranjedukkaam; ennirunnaalum, selective forgariyil, akramanam aarambhikkunnathin munbu formula _ 1 nischayikkanam.
thiranjeduttha vyaajarekha chamaykkal akramanam vijayakaramaayi nadathaanulla kazhivu oru asthithvaparamaaya vyaajarekha chamaykkal akramanam vijayakaramaayi nadathaanulla kazhivine soochippikkunnu.
asthithvaparamaaya vyaajarekha.
niyamaanusrithamaaya oppittayal orikkalum formula 1 oppittitlaatha formula _ 6 enna oru sandesha/oppu jodiyengilum srishtikkunnathaanu (oru ethiraali) asthithwa forgery (asthithvaparamaaya oppu vaykkaanaavaatha, yuf). athiraalikalkku swathanthramaayi formula 1 thiranjedukkaam; formula 1 nuu prathyeka ardhamonnum aavasyamilla; sandeshathinte ulladakkam aprasakthamaan-formula 6 enna jody saadhuthayullidatholam kaalam, athiraalikal oru asthithvaparamaaya vyaajarekha nirmikkunnathil vijayichu. athinaal, oru asthithvaparamaaya vyaajarekha srishtikkunnathu oru thiranjeduttha vyaajarekhayekkaal eluppamaanu, kaaranam aakramanakaarikk oru fordery eluppathil srishtikkaan kazhiyunna oru sandesha formula _ 1 thiranjedukkaam, athesamayam thiranjeduttha vyaajarekhayude kaaryatthil, velluvilikkaaran oru "budhimuttulla" sandeshathinte oppu chodikkaam.
asthithvaparamaaya vyaajarekhayude udaaharanam.
rSA cryptosistathinti inipparayunna gunana savisheshathayundu formula _ 16.
signature formula _ 18 upayogichu oru sandesha formula _ 17 srishtikkunnathiloode eee property chooshanam cheyyaan kazhiyum.
eee aakramanathinu oru pothu prathirodham sandeshangal oppidunnathinu munbu haash cheyyuka ennathaanu.
durbalamaaya asthithvaparamaaya vyaajarekha (sakthamaaya asthithvaparamaaya kshamikkaanaavaatha, sakthamaaya kshamikkaanaavaatha; syoof, allengil suf).
eee ashayam mukalil vishadeekaricha asthithvaparamaaya vyaajarekhayude sakthamaaya (kooduthal surakshithamaaya) vakabhedamaanu. niyamaanusrithamaaya oppittayal nirmmicha oru sandeshavum vyathyastha oppu formula nalkia formula _ 19 enna oru sandeshamo oppu jodiyengilum (oru ethiraali) srishtikkunnathaanu durbalamaaya asthithwa fortery.
sakthamaaya asthithvaparamaaya vyaajarekha adisthaanaparamaayi ettavum durbalamaaya ethir lakshyamaanu, athinaal ettavum sakthamaaya padhathikal "nilanilppin shakthamayi maapparhikkaathava" aanu.

