Passage: Public-key cryptography is also used for implementing digital signature schemes. A digital signature is reminiscent of an ordinary digital signature; they both have the characteristic of being easy for a user to produce, but difficult for anyone else to forge. Digital signatures can also be permanently tied to the content of the message being signed; they can't then be'moved' from one document to another, for any attempt will be detectable. Katika digital signature schemes, kuna algorithms mbili: moja kwa ajili ya kusaini, ambayo ufunguo wa siri ni kutumika mchakato ujumbe (au hash ya ujumbe, au wote wawili), na moja kwa ajili ya uthibitisho, ambayo ya umma kulinganisha ni kutumika na ujumbe wa kuangalia uhalali wa saini. RSA na DSA ni mbili ya maarufu zaidi digital saini schemes. saini digital ni muhimu kwa ajili ya operesheni ya usalama wa mtumiaji, lakini vigumu kwa mtu mwingine yeyote kughushi. Saini digital saini inaweza pia kuwa daima amefungwa na maudhui ya ujumbe kusainiwa; hawawezi kisha 'kuhamishwa' kutoka hati moja hadi nyingine, kwa jaribio
ni muhimu kwa ajili ya uendeshaji wa miundombinu ya umma muhimu