{"id":1308,"date":"2014-08-07T07:55:47","date_gmt":"2014-08-07T07:55:47","guid":{"rendered":"http:\/\/bitcoinromania.ro\/?p=1308"},"modified":"2026-03-01T13:46:47","modified_gmt":"2026-03-01T11:46:47","slug":"construirea-blocurilor-criptografice","status":"publish","type":"post","link":"https:\/\/bitcoinromania.ro\/blog\/construirea-blocurilor-criptografice\/","title":{"rendered":"Construirea blocurilor criptografice"},"content":{"rendered":"<p>Vom \u00eencepe s\u0103 vorbim despre construirea blocurilor criptografice folosite \u00een protocolul Bitcoin. Toate acestea, produc caracteristici definitorii ale Bitcoin ca moned\u0103 digital\u0103 \u0219i sistem de pl\u0103\u021bi.<\/p>\n<ul>\n<li><strong>Criptografia cheii publicii<\/strong><\/li>\n<\/ul>\n<p>\u00cen 1976, Diffie \u0219i Hellman introduc conceptul criptografiei cheii publice, \u00een care un utilizator are at\u00e2t o cheie public\u0103, c\u00e2t \u0219i privat\u0103. Primitorul mesajului \u00ee\u0219i face public\u0103 cheia public\u0103 care poate fi folosit\u0103 de oricine dore\u0219te s\u0103 trimit\u0103 un mesaj primitorului. Cel care trimite mesajul utilizeaz\u0103 pur \u0219i simplu cheia public\u0103 pentru a codifica un mesaj \u00eentr-un text cu cifru, iar primitorul folose\u0219te cheia privat\u0103 pentru a decodifica textul respectiv cu cifru \u00een originalul mesaj. Sub aceast\u0103 schem\u0103, cel care trimite \u0219i care prime\u0219te nu trebuie s\u0103 aib\u0103 un canal secret de comunicare. Secretul mesajului codificat este conservat chiar dac\u0103 atacatorul cunoa\u0219te cheia codific\u0103rii, at\u00e2t timp c\u00e2t cel care trebuie s\u0103 primeasc\u0103 mesajul \u00ee\u0219i \u021bine secret\u0103 cheia privat\u0103.<\/p>\n<p>Aceast\u0103 schem\u0103 asimetric\u0103 a criptografiei introdus\u0103 de Diffie \u0219i Hellman a fost \u00een mod special pliabil\u0103 pe aplica\u021biile de securitate ale sistemelor deschise precum internetul, unde cel care trimite \u0219i cel care prime\u0219te probabil c\u0103 nu se cunosc sau nu au avut ocazia de a seta un canal privat de comunicare. Aceast\u0103 schem\u0103 se bazeaz\u0103 pe faptul c\u0103 codificarea este u\u0219oar\u0103, \u00eens\u0103 reversibilitatea acesteia prin decodificare este irealizabil\u0103 din punct de vedere computerizat pentru oricine altcineva dec\u00e2t primitorul.<\/p>\n<p>Prima implementare a lui Diffie \u0219i Hellman a fost criptosistemul cu cheie public\u0103 RSA, divizat\u0103 de Ronald Rivest \u00een 1977. Pentru \u00eentregul algoritm RSA, v\u0103 rug\u0103m s\u0103 face\u021bi o mic\u0103 c\u0103utare pe net dup\u0103 \u00eentreg articolul publicat de Rivest.<\/p>\n<p><a href=\"http:\/\/bitcoinromania.ro\/wp-content\/uploads\/2014\/06\/cropped-buy-sell-bitcoin1.jpg\"><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter wp-image-821\" src=\"http:\/\/bitcoinromania.ro\/wp-content\/uploads\/2014\/06\/cropped-buy-sell-bitcoin1.jpg\" alt=\"cropped-buy-sell-bitcoin1\" width=\"640\" height=\"135\" srcset=\"https:\/\/bitcoinromania.ro\/blog\/wp-content\/uploads\/2014\/06\/cropped-buy-sell-bitcoin1.jpg 940w, https:\/\/bitcoinromania.ro\/blog\/wp-content\/uploads\/2014\/06\/cropped-buy-sell-bitcoin1-300x63.jpg 300w, https:\/\/bitcoinromania.ro\/blog\/wp-content\/uploads\/2014\/06\/cropped-buy-sell-bitcoin1-400x84.jpg 400w\" sizes=\"(max-width: 640px) 100vw, 640px\" \/><\/a><\/p>\n<ul>\n<li><strong>Semn\u0103turile digitale<\/strong><\/li>\n<\/ul>\n<p>Codificarea \u0219i decodificarea asigur\u0103 securitatea prin prevenirea adversit\u0103\u0163ilor \u00een a accesa mesajul trimis de la cel care trimite c\u0103tre cel care prime\u0219te. Cu toate acestea, autentificarea mesajului trebuie utilizat\u0103 \u00een aceea\u0219i conjunctur\u0103 cu cheia public\u0103 a codific\u0103rii. Semn\u0103tura digital\u0103 este un mecanism popular pentru autentificarea mesajului \u0219i au trei propriet\u0103\u021bi dorite: \u00eei ofer\u0103 posibilitatea celui care prime\u0219te mesajul s\u0103 valideze faptul c\u0103 trimi\u021b\u0103torul corect a trimis de fapt acel mesaj ( autentificare ), c\u0103 trimi\u021b\u0103torul nu are cum s\u0103 nege faptul c\u0103 a trimis mesajul respectiv ( non-renegare ), \u0219i c\u0103 mesajul nu a fost modificat \u00een niciun fel de altcineva ( integritate ). Pentru a se ajunge la aceste lucruri, trimi\u021b\u0103torul creaz\u0103 o semn\u0103tur\u0103 digital\u0103 folosindu-\u0219i cheia privat\u0103 \u0219i trimite mesajul \u201esemnat\u201d c\u0103tre cel care \u00eel va primi. At\u00e2t timp c\u00e2t cel care prime\u0219te mesajul cunoa\u0219te cheia public\u0103 a celui care l-a trimis, acesta poate folosi un algoritm de verificare pentru a vedea dac\u0103 mesajul a fost semnat de proprietarul original \u0219i nu a fost modificat \u00een vreun fel.<\/p>\n<p>Semn\u0103turile digitale sunt folosite la nivel global \u00een tranzac\u021biile electronice datorit\u0103 autenticit\u0103\u0163ii mesajului care poate fi verificat de oricine care are cheia public\u0103 a celui care \u00eel trimite. Un alt avantaj este faptul c\u0103 semn\u0103tura digital\u0103 este verificabil\u0103 \u00een mod public \u2013 dac\u0103 cel care prime\u0219te verific\u0103 semn\u0103tura unui mesaj primit ca fiind legitim, atunci toate celelalte p\u0103r\u021bi ( precum intermediari sau p\u0103r\u021bi ter\u021be ) care pot primi acela\u0219i mesaj ar trebui s\u0103 \u00eei valideze autenticitatea. \u00cen special, protocolul Bitcoin folose\u0219te ECDSA ( Elliptic Curve Digital Signature Algorithm ).<\/p>\n<ul>\n<li><strong>Func\u021biile hash<\/strong><\/li>\n<\/ul>\n<p>Pentru a suplimenta tot ceea ce am spus p\u00e2n\u0103 acum, protocolul Bitcoin are de asemenea o func\u021bie hash criptografic\u0103 SHA-1. Criptografia cheii publice \u0219i schema semn\u0103turii digitale folosesc \u00een mod tipic func\u021bii hash \u00een algoritmii lor, care schimb\u0103 \u0219irul de caractere de dimensiune arbitrar\u0103 \u00een unele mai scurte de dimensiune fix\u0103. De exemplu, func\u021bia hash folosit\u0103 la nivel global SHA-1 produce o valoare de 160 de bi\u021bi. Mai bine dec\u00e2t semnarea \u00eentregului mesaj, este mult mai sensibil\u0103 la codificarea unei versiune hash a mesajului. Ideal, aceast\u0103 func\u021bie hash ar trebui s\u0103 aib\u0103 o singur\u0103 direc\u021bie: av\u00e2nd o lungime fix\u0103 a \u0219irului de caractere, ar trebui s\u0103 fie foarte dificil s\u0103 se g\u0103seasc\u0103 un \u0219ir de caractere cu aceea\u0219i ie\u0219ire. \u00cen mod adi\u021bional, func\u021bia hash ar trebui s\u0103 fie rezistent\u0103 la \u201ecoliziuni\u201d, lucru care ar fi foarte greu de realizat din punct de vedere computerizat pentru a g\u0103si dou\u0103 mesaje care \u00eemp\u0103rt\u0103\u0219esc aceea\u0219i valoare hash.<\/p>\n<p>Cu alte cuvinte, ar fi imposibil ca algoritmul s\u0103 g\u0103seasc\u0103 x , y,\u00a0 x\u00a0\u2260 y cu H(x) = H(x&#8217;).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Vom \u00eencepe s\u0103 vorbim despre construirea blocurilor criptografice folosite \u00een protocolul Bitcoin. Toate acestea, produc caracteristici definitorii ale Bitcoin ca moned\u0103 digital\u0103 \u0219i sistem de pl\u0103\u021bi. Criptografia cheii publicii \u00cen 1976, Diffie \u0219i Hellman introduc conceptul criptografiei cheii publice, \u00een care un utilizator are at\u00e2t o cheie public\u0103, c\u00e2t \u0219i privat\u0103. Primitorul mesajului \u00ee\u0219i face public\u0103 cheia public\u0103 care poate fi folosit\u0103 de oricine dore\u0219te s\u0103 trimit\u0103 un mesaj primitorului. Cel care trimite mesajul utilizeaz\u0103 pur \u0219i simplu cheia public\u0103<a class=\"more-link\" href=\"https:\/\/bitcoinromania.ro\/blog\/construirea-blocurilor-criptografice\/\"><span>Read More<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":752,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"class_list":["post-1308","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bitcoin"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Construirea blocurilor criptografice - Bitcoin Romania<\/title>\n<meta name=\"description\" content=\"Vom \u00eencepe s\u0103 vorbim despre construirea blocurilor criptografice folosite \u00een protocolul Bitcoin.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/bitcoinromania.ro\/blog\/construirea-blocurilor-criptografice\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Construirea blocurilor criptografice - 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