{"id":3511,"date":"2025-03-18T21:59:41","date_gmt":"2025-03-18T21:59:41","guid":{"rendered":"https:\/\/securitybriefing.net\/?p=3511"},"modified":"2025-03-18T21:59:45","modified_gmt":"2025-03-18T21:59:45","slug":"cum-contribuie-un-hash-la-securizarea-tehnologiei-blockchain","status":"publish","type":"post","link":"https:\/\/securitybriefing.net\/ro\/lant-de-blocuri\/cum-contribuie-un-hash-la-securizarea-tehnologiei-blockchain\/","title":{"rendered":"Cum ajut\u0103 un hash la securizarea tehnologiei blockchain?"},"content":{"rendered":"<p>Un hash creeaz\u0103 o amprent\u0103 digital\u0103 de ne\u00eentrerupt, care face ca tehnologia blockchain s\u0103 fie sigur\u0103. Fiecare tranzac\u021bie \u0219i bloc din lan\u021b prime\u0219te propria semn\u0103tur\u0103 unic\u0103. Aceast\u0103 funda\u021bie digital\u0103 ofer\u0103 un registru permanent pe care nimeni nu \u00eel poate modifica f\u0103r\u0103 a l\u0103sa urme.<\/p>\n\n\n\n<p class=\"translation-block\"><a href=\"https:\/\/securitybriefing.net\/ro\/criptomoneda\/cat-de-sigura-este-tehnologia-blockchain\/\" target=\"_self\">Blockchain<\/a> hashing func\u021bioneaz\u0103 ca un sistem de securitate de ultim\u0103 genera\u021bie. Semn\u0103tura unic\u0103 a fiec\u0103rui bloc con\u021bine at\u00e2t propriul s\u0103u hash, c\u00e2t \u0219i hash-ul blocului anterior. Sistemul leag\u0103 toate informa\u021biile \u00eentr-un mod care face manipularea extrem de dificil\u0103. Func\u021biile hash utilizeaz\u0103 algoritmi puternici precum SHA-256 pentru a converti datele \u00een rezultate de lungime fix\u0103. Aceste rezultate ac\u021bioneaz\u0103 ca ID-uri rezistente la manipulare care protejeaz\u0103 integritatea \u0219i securitatea re\u021belei blockchain.<\/p>\n\n\n\n<p>S\u0103 explor\u0103m cum func\u021biile hash alimenteaz\u0103 tehnologia blockchain. Vom analiza rolul lor \u00een prevenirea manipul\u0103rii datelor \u0219i de ce sunt esen\u021biale pentru a men\u021bine securitatea re\u021belelor descentralizate.<\/p>\n\n\n\n<p><\/p>\n\n\n<h2 class=\"wp-block-heading\" id=\"what-is-a-hash-function-in-blockchain-technology\">Ce este o func\u021bie hash \u00een tehnologia blockchain?<\/h2>\n\n\n<p><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"translation-block\">\u201eHashing-ul este \u00een centrul securit\u0103\u021bii blockchain.\u201d \u2014 <a href=\"https:\/\/www.goodreads.com\/work\/quotes\/59117246-blockchain-technology-explained-the-ultimate-beginner-s-guide-about-blo\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Alan T. Norman<\/strong>, <em>Expert \u00een blockchain \u0219i autor<\/em><\/a><\/p>\n<\/blockquote>\n\n\n\n<p>Func\u021biile hash ac\u021bioneaz\u0103 ca elementul vital al arhitecturii blockchain. Aceste mecanisme criptografice securizeaz\u0103 \u00eentregul sistem. S\u0103 vedem ce face ca ace\u0219ti algoritmi matematici s\u0103 fie esen\u021biali pentru securitatea blockchain-ului.<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"definition-and-simple-properties-of-hash-functions\">Defini\u021bie \u0219i propriet\u0103\u021bi simple ale func\u021biilor hash<\/h3>\n\n\n<p class=\"translation-block\">O func\u021bie de hash func\u021bioneaz\u0103 ca un algoritm matematic care transform\u0103 date de orice dimensiune \u00eentr-un <a href=\"https:\/\/en.wikipedia.org\/wiki\/Hash_function\" target=\"_blank\" rel=\"noreferrer noopener\">\u0219ir de caractere de lungime fix\u0103<\/a>. Ie\u0219irea arat\u0103 aleatoriu \u0219i func\u021bioneaz\u0103 ca o amprent\u0103 digital\u0103 unic\u0103 a informa\u021biei originale. Oamenii numesc adesea aceast\u0103 ie\u0219ire \u201evaloare hash\u201d, \u201ecod hash\u201d sau \u201edigest\u201d.<\/p>\n\n\n\n<p class=\"translation-block\">Aplica\u021biile blockchain au nevoie de func\u021bii hash cu propriet\u0103\u021bi specifice pentru a fi criptografic sigure. Func\u021bia trebuie s\u0103 fie determinist\u0103, ceea ce \u00eenseamn\u0103 c\u0103 aceea\u0219i intrare creeaz\u0103 \u00eentotdeauna un rezultat hash similar. Este necesar\u0103 <a href=\"https:\/\/www.halborn.com\/blog\/post\/blockchain-hash-functions\" target=\"_blank\" rel=\"noreferrer noopener\">rezisten\u021ba la coliziuni<\/a>, ceea ce face dificil\u0103 g\u0103sirea a dou\u0103 intr\u0103ri diferite care creeaz\u0103 acela\u0219i hash. O func\u021bie hash bun\u0103 arat\u0103 \u201eefectul avalan\u0219ei\u201d, unde schimbarea unui singur caracter \u00een intrare creeaz\u0103 un hash complet diferit.<\/p>\n\n\n\n<p>Un expert \u00een criptografie o pune astfel: \u201eO func\u021bie hash bun\u0103 satisface dou\u0103 propriet\u0103\u021bi simple: ar trebui s\u0103 fie foarte rapid\u0103 de calculat \u0219i ar trebui s\u0103 minimizeze duplicarea valorilor de ie\u0219ire (coliziuni).\u201d Aceste calit\u0103\u021bi lucreaz\u0103 \u00eempreun\u0103 pentru a proteja datele blockchain de manipulare.<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"oneway-transformation-process\">Proces de transformare unidirec\u021bional\u0103<\/h3>\n\n\n<p>Natura unidirec\u021bional\u0103 se remarc\u0103 drept principala caracteristic\u0103 de securitate a func\u021biilor hash \u00een tehnologia blockchain. Po\u021bi crea u\u0219or un hash din datele de intrare, dar nu po\u021bi lucra \u00eenapoi pentru a ob\u021bine datele de intrare originale dintr-un hash.<\/p>\n\n\n\n<p>Aceast\u0103 calitate este cunoscut\u0103 sub termenul tehnic \u201erezisten\u021b\u0103 la preimagine\u201d \u0219i ofer\u0103 blockchain-ului securitatea sa de baz\u0103. G\u00e2nde\u0219te-te la asta ca la baterea unui ou \u2013 nu po\u021bi pune g\u0103lbenu\u0219ul \u00eenapoi \u0219i sigila coaja.<\/p>\n\n\n\n<p>Func\u021biile hash arat\u0103 \u0219i \u201erezisten\u021ba la a doua preimagine\u201d. Nu po\u021bi g\u0103si un alt input care s\u0103 genereze acela\u0219i hash, chiar dac\u0103 \u0219tii at\u00e2t un input, c\u00e2t \u0219i hash-ul s\u0103u. Actorii r\u0103u inten\u021biona\u021bi nu pot \u00eenlocui datele reale cu informa\u021bii false, p\u0103str\u00e2nd \u00een acela\u0219i timp aceea\u0219i valoare de hash.<\/p>\n\n\n\n<p>Transformarea unidirec\u021bional\u0103 face ca blockchain-ul s\u0103 fie responsabil. Datele care sunt supuse func\u021biei de hash \u0219i ad\u0103ugate \u00een lan\u021b r\u0103m\u00e2n neschimbate \u2013 aceasta este ceea ce face ca blockchain-ul s\u0103 fie imuabil.<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"fixed-output-length-whatever-the-input-size\">Lungime de ie\u0219ire fix\u0103, indiferent de dimensiunea intr\u0103rii<\/h3>\n\n\n<p>Func\u021biile hash creeaz\u0103 \u00eentotdeauna ie\u0219iri de aceea\u0219i lungime, indiferent de m\u0103rimea intr\u0103rii. Pentru a da doar un exemplu, SHA-256, care este utilizat de Bitcoin \u0219i alte criptomonede, creeaz\u0103 \u00eentotdeauna o valoare hash de 256 de bi\u021bi (de obicei afi\u0219at\u0103 ca 64 de caractere hexazecimale). Acest lucru se \u00eent\u00e2mpl\u0103 indiferent dac\u0103 introduce\u021bi un cuv\u00e2nt sau o \u00eentreag\u0103 carte.<\/p>\n\n\n\n<p>Aceast\u0103 lungime fix\u0103 ajut\u0103 tehnologia blockchain \u00een mai multe moduri:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Structura de date r\u0103m\u00e2ne consistent\u0103 pe \u00eentreaga blockchain.<\/li>\n\n\n\n<li>Stocarea \u0219i procesarea datelor de tranzac\u021bie devin eficiente.<\/li>\n\n\n\n<li>Procesele de verificare func\u021bioneaz\u0103 la fel pe \u00eentreaga re\u021bea.<\/li>\n\n\n\n<li>Nevoile de calcul devin previzibile.<\/li>\n<\/ul>\n\n\n\n<p>Func\u021biile hash comprim\u0103 cantit\u0103\u021bi mari de date de tranzac\u021bie \u00een valori de dimensiune fix\u0103 pe care re\u021beaua blockchain le poate stoca, trimite \u0219i verifica u\u0219or. Harta de lungime fix\u0103 ajut\u0103 blockchain-urile s\u0103 gestioneze tranzac\u021bii de dimensiuni diferite, men\u021bin\u00e2nd o performan\u021b\u0103 constant\u0103.<\/p>\n\n\n\n<p>Func\u021biile hash ofer\u0103 tehnologiei blockchain o metod\u0103 inteligent\u0103 de a crea amprente digitale verificabile. Aceste amprente digitale garanteaz\u0103 c\u0103 datele r\u0103m\u00e2n intacte prin matematic\u0103, \u00een loc s\u0103 se bazeze pe o autoritate central\u0103.<\/p>\n\n\n<h2 class=\"wp-block-heading\" id=\"core-mechanisms-of-blockchain-hashing\">Mecanismele de baz\u0103 ale hashing-ului blockchain<\/h2>\n\n\n<p>Hashingul criptografic sofisticat st\u0103 la baza arhitecturii de securitate a blockchain-ului. Acest sistem ac\u021bioneaz\u0103 ca fundament tehnologic pentru sistemele de registre distribuite. Imuabilitatea \u0219i lipsa de \u00eencredere celebre ale blockchain-ului se bazeaz\u0103 pe aceast\u0103 funda\u021bie de hashing.<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"creating-unique-digital-fingerprints\">Crearea amprentelor digitale unice<\/h3>\n\n\n<p>Hashing-ul blockchain transform\u0103 datele de orice dimensiune \u00een \u0219iruri de caractere de lungime fix\u0103, care func\u021bioneaz\u0103 ca amprente digitale unice. Aceste amprente ac\u021bioneaz\u0103 ca sigilii rezistente la manipulare pentru a proteja integritatea datelor blockchain. Datele care trec printr-o func\u021bie hash creeaz\u0103 o ie\u0219ire unic\u0103 ce identific\u0103 acel set de date specific.<\/p>\n\n\n\n<p>Reprezentarea criptografic\u0103 a fiec\u0103rui bloc \u00eel face unic identificabil prin hash-ul s\u0103u. O mic\u0103 modificare a oric\u0103rei tranzac\u021bii creeaz\u0103 un hash dramatic diferit \u2013 exper\u021bii numesc acest efectul avalan\u0219ei. Astfel, oricine \u00eencearc\u0103 s\u0103 modifice datele nu poate ascunde urmele lor, deoarece sistemul detecteaz\u0103 imediat schimb\u0103rile.<\/p>\n\n\n\n<p>Aceste amprente digitale permit re\u021belelor blockchain:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Demonstreaz\u0103 c\u0103 datele sunt reale f\u0103r\u0103 a ar\u0103ta con\u021binutul original<\/li>\n\n\n\n<li>Detecta\u021bi chiar \u0219i cele mai mici modific\u0103ri neautorizate.<\/li>\n\n\n\n<li>P\u0103streaz\u0103 tranzac\u021biile \u00een ordine cronologic\u0103<\/li>\n\n\n\n<li>Arat\u0103 dovada c\u0103 datele r\u0103m\u00e2n intacte.<\/li>\n<\/ul>\n\n\n<h3 class=\"wp-block-heading\" id=\"linking-blocks-through-previous-block-hashes\">Legarea blocurilor prin hash-urile blocului anterior<\/h3>\n\n\n<p>Designul str\u0103lucitor al blockchain-ului se eviden\u021biaz\u0103 prin modul \u00een care blocurile sunt conectate prin pointere hash. Fiecare bloc con\u021bine hash-ul s\u0103u unic \u0219i hash-ul blocului anterior \u00een antetul s\u0103u. Criptografii numesc acest lucru o \u201elan\u021b de blocuri\u201d \u2013 caracteristica cheie care face blockchain-ul special.<\/p>\n\n\n\n<p>Blocurile noi trebuie s\u0103 indice hash-ul blocului anterior pentru a fi valide. Acest lucru creeaz\u0103 o leg\u0103tur\u0103 cronologic\u0103 \u0219i criptografic\u0103 \u00eentre blocuri. Orice modificare a unui bloc mai vechi ar crea un nou hash care rupe conexiunea cu toate blocurile ulterioare.<\/p>\n\n\n\n<p>Oricine \u00eencearc\u0103 s\u0103 modifice datele blockchain ar trebui s\u0103 recalculeze hash-ul fiec\u0103rui bloc dup\u0103 schimbare. Aceast\u0103 sarcin\u0103 devine imposibil\u0103 pe re\u021bele vechi de 10 ani. Aceast\u0103 caracteristic\u0103 creeaz\u0103 faimoasa natur\u0103 imuabil\u0103 a blockchain-ului.<\/p>\n\n\n\n<p>Hash-urile blocurilor anterioare ancoreaz\u0103 criptografic \u00eentreaga istorie a tranzac\u021biilor. Exper\u021bii \u00een securitate explic\u0103 simplu: \u201eModificarea chiar \u0219i a unui singur bit \u00een antetul blocului va face ca hash-ul antetului blocului s\u0103 fie diferit, ceea ce va face ca blocul modificat s\u0103 fie invalid.\u201d<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"ensuring-data-consistency-across-the-network\">Asigurarea consisten\u021bei datelor \u00een \u00eentreaga re\u021bea<\/h3>\n\n\n<p>Func\u021biile hash ajut\u0103 la men\u021binerea consisten\u021bei datelor \u00een re\u021belele blockchain distribuite. Hash-urile blocurilor ofer\u0103 o modalitate compact\u0103 de a verifica tranzac\u021biile grupate f\u0103r\u0103 a le procesa pe fiecare separat.<\/p>\n\n\n\n<p>Re\u021belele ajung la un acord privind starea actual\u0103 a registrelor prin consens bazat pe hash, chiar \u0219i cu noduri distribuite la nivel global. Nodurile verific\u0103 independent hash-urile blocurilor pentru a se asigura c\u0103 copia lor a blockchain-ului corespunde cu a tuturor celorlal\u021bi.<\/p>\n\n\n\n<p>Arborii Merkle folosesc hashing stratificat pentru a organiza multe tranzac\u021bii eficient. Nodurile pot verifica tranzac\u021bii specifice \u00eentr-un bloc f\u0103r\u0103 a desc\u0103rca \u00eentreaga blockchain \u2013 o caracteristic\u0103 crucial\u0103 pentru cre\u0219tere.<\/p>\n\n\n\n<p>Amprentarea unic\u0103, leg\u0103tura blocurilor \u0219i verificarea la nivel de re\u021bea lucreaz\u0103 \u00eempreun\u0103 prin hashing. Aceste func\u021bionalit\u0103\u021bi fac tehnologia blockchain rezistent\u0103 la cenzur\u0103, manipulare \u0219i modific\u0103ri neautorizate.<\/p>\n\n\n<h2 class=\"wp-block-heading\" id=\"how-hash-functions-prevent-data-tampering\">Cum previn func\u021biile hash manipularea datelor<\/h2>\n\n\n<p>Natura rezistent\u0103 la manipulare a tehnologiei blockchain provine din modul \u00een care func\u021biile hash reac\u021bioneaz\u0103 chiar \u0219i la cele mai mici schimb\u0103ri de date. Mai multe straturi de protec\u021bie criptografic\u0103 fac ca \u00eenregistr\u0103rile blockchain s\u0103 fie aproape imposibil de schimbat f\u0103r\u0103 a fi depistate.<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"the-avalanche-effect-in-cryptographic-hashing\">Efectul avalan\u0219ei \u00een hashingul criptografic<\/h3>\n\n\n<p>Func\u021biile de hash criptografice au o caracteristic\u0103 important\u0103 de securitate numit\u0103 efectul avalan\u0219\u0103. Acest lucru se \u00eent\u00e2mpl\u0103 atunci c\u00e2nd datele de intrare mici se schimb\u0103\u2014cum ar fi schimbarea unui singur bit\u2014cre\u00e2nd schimb\u0103ri uria\u0219e \u0219i aleatorii \u00een ie\u0219irea hash-ului. O singur\u0103 schimbare de bit mut\u0103 de obicei aproximativ jum\u0103tate din bi\u021bii de ie\u0219ire \u00een pozi\u021bii diferite.<\/p>\n\n\n\n<p>Modul \u00een care intr\u0103ri similare creeaz\u0103 ie\u0219iri total diferite construie\u0219te un scut de securitate puternic. S\u0103 lu\u0103m un exemplu real: dac\u0103 cineva \u00eencearc\u0103 s\u0103 schimbe datele unei tranzac\u021bii \u00eentr-o blockchain doar pu\u021bin, va ob\u021bine un hash complet diferit fa\u021b\u0103 de original. Un expert \u00een criptografie o pune \u00een felul urm\u0103tor: \"randomizarea puternic\u0103 care, de fapt, rezult\u0103 \u00een expunerea cerin\u021belor de baz\u0103 de securitate, inclusiv rezisten\u021ba la coliziune, preimagine \u0219i rezisten\u021ba la second preimage.\"<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"detecting-even-minor-changes-in-block-data\">Detectarea chiar \u0219i a celor mai mici modific\u0103ri \u00een datele blocului<\/h3>\n\n\n<p>Re\u021belele blockchain detecteaz\u0103 imediat tentativele de manipulare prin acest proces. Fiecare bloc con\u021bine hash-ul datelor sale, iar orice modificare \u2013 indiferent c\u00e2t de mic\u0103 \u2013 creeaz\u0103 o valoare hash foarte diferit\u0103. Aceast\u0103 detec\u021bie rapid\u0103 face ca blockchain s\u0103 fie o metod\u0103 fiabil\u0103 pentru a men\u021bine datele \u00een siguran\u021b\u0103.<\/p>\n\n\n\n<p>Procesul de detectare a manipul\u0103rii func\u021bioneaz\u0103 deoarece:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Hash-ul unui bloc captureaz\u0103 starea complet\u0103 atunci c\u00e2nd este creat.<\/li>\n\n\n\n<li>Nodurile de re\u021bea verific\u0103 hash-urile blocurilor pentru a verifica copiile lor de blockchain.<\/li>\n\n\n\n<li>Diferite valori de hash calculate \u0219i stocate indic\u0103 o posibil\u0103 manipulare.<\/li>\n\n\n\n<li>Sistemul respinge automat blocurile cu hash-uri gre\u0219ite.<\/li>\n<\/ul>\n\n\n\n<p>Da, este adev\u0103rat c\u0103 aceast\u0103 detec\u021bie func\u021bioneaz\u0103 dincolo de tranzac\u021biile individuale. Hash-ul fiec\u0103rui bloc ac\u021bioneaz\u0103 ca un rezumat criptografic care verific\u0103 legitimitatea tuturor datelor sale, ar\u0103t\u00e2nd imediat modific\u0103rile neautorizate din \u00eentreaga re\u021bea.<\/p>\n\n\n\n<p><\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"computational-difficulty-of-altering-linked-blocks\">Dificultatea computa\u021bional\u0103 de a modifica blocurile legate<\/h3>\n\n\n<p>Cea mai mare caracteristic\u0103 de securitate a hashing-ului blockchain ar putea fi uria\u0219a provocare de calcul pentru a schimba blocurile legate. Fiecare bloc con\u021bine hash-ul blocului anterior, astfel \u00eenc\u00e2t modificarea datelor \u00eenseamn\u0103 recalcularea hash-ului s\u0103u \u0219i a hash-urilor tuturor blocurilor urm\u0103toare.<\/p>\n\n\n\n<p>Aceast\u0103 structur\u0103 conectat\u0103 creeaz\u0103 ceea ce exper\u021bii \u00een securitate numesc o cerin\u021b\u0103 de \u201ereac\u021bie \u00een lan\u021b\u201d. Pentru a manipula cu succes datele blockchain, un atacator trebuie s\u0103:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Schimb\u0103 datele blocului \u021bint\u0103<\/li>\n\n\n\n<li>Ob\u021bine\u021bi un nou hash pentru acel bloc<\/li>\n\n\n\n<li>Actualiza\u021bi valoarea \"Previous Hash\" a blocului urm\u0103tor.<\/li>\n\n\n\n<li>Ob\u021bine noi hash-uri pentru toate blocurile ulterioare<\/li>\n\n\n\n<li>F\u0103 toate acestea mai repede dec\u00e2t noile blocuri se al\u0103tur\u0103 lan\u021bului.<\/li>\n<\/ol>\n\n\n\n<p>Pe re\u021bele blockchain de 10 ani cu mii de noduri, aceast\u0103 sarcin\u0103 devine aproape imposibil\u0103. Lan\u021bul real cre\u0219te mai lung \u00eenainte ca un atacator s\u0103 poat\u0103 chiar recalcula c\u00e2teva blocuri, iar re\u021beaua respinge versiunea modificat\u0103 ca fiind fals\u0103.<\/p>\n\n\n\n<p>Pentru a rezuma, combina\u021bia efectului de avalan\u0219\u0103, abilit\u0103\u021bilor rapide de detectare \u0219i a nevoilor masive de calcul creeaz\u0103 un sistem de securitate de \u00eencredere care face tehnologia blockchain foarte greu de manipulat.<\/p>\n\n\n\n<p><\/p>\n\n\n<h2 class=\"wp-block-heading\" id=\"popular-hash-algorithms-in-major-blockchains\">Algoritmi de hash populari \u00een principalele blockchainuri<\/h2>\n\n\n<p>Fiecare re\u021bea blockchain utilizeaz\u0103 algoritmi de hash diferi\u021bi. Fiecare re\u021bea \u00ee\u0219i alege algoritmul pe baza performan\u021bei sale \u0219i a securit\u0103\u021bii necesare. Aceste alegeri afecteaz\u0103 c\u00e2t de sigur\u0103 \u0219i eficient\u0103 este fiecare platform\u0103.<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"sha256-in-bitcoin\">SHA-256 \u00een Bitcoin<\/h3>\n\n\n<p class=\"translation-block\">Bitcoin utilizeaz\u0103 SHA-256 (Secure Hashing Algorithm-256) ca func\u021bie criptografic\u0103 principal\u0103. Acest algoritm, dezvoltat de NSA, creeaz\u0103 ie\u0219iri fixe de 256 de bi\u021bi pentru a securiza multe p\u0103r\u021bi ale re\u021belei Bitcoin. <a href=\"https:\/\/www.ledger.com\/academy\/glossary\/sha-256\" target=\"_blank\" rel=\"noreferrer noopener\">SHA-256 regleaz\u0103 adresele publice<\/a> \u0219i face verificarea tranzac\u021biilor mai u\u0219oar\u0103 prin semn\u0103turi digitale. Aceste semn\u0103turi protejeaz\u0103 datele f\u0103r\u0103 a ar\u0103ta con\u021binutul.<\/p>\n\n\n\n<p>Bitcoin adopt\u0103 o abordare unic\u0103 utiliz\u00e2nd SHA-256 de dou\u0103 ori pentru a \u00eembun\u0103t\u0103\u021bi securitatea. Aceast\u0103 metod\u0103 de dublu hash ajut\u0103 la prevenirea problemelor precum atacurile de extindere a lungimii.<\/p>\n\n\n\n<p>SHA-256 este esen\u021bial \u00een mineritul Proof of Work, unde minerii calculeaz\u0103 hash-urile blocurilor. Fiecare bloc are un hash SHA-256 care indic\u0103 blocul anterior. Aceast\u0103 lan\u021b de hash-uri men\u021bine blockchain-ul sigur.<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"ethash-in-ethereum\">Ethash \u00een Ethereum<\/h3>\n\n\n<p class=\"translation-block\">Primul sistem Proof of Work al Ethereum a folosit Ethash, care este un algoritm modificat Dagger-Hashimoto. Spre deosebire de SHA-256, <a href=\"https:\/\/cleartax.in\/s\/ethash\" target=\"_blank\" rel=\"noreferrer noopener\">Ethash a fost construit pentru a rezista la mining-ul ASIC<\/a>. Acest design permite mai multor persoane s\u0103 mineze folosind computere obi\u0219nuite.<\/p>\n\n\n\n<p>Iat\u0103 cum func\u021bioneaz\u0103 Ethash:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Creeaz\u0103 un seed din anteturile blocului<\/li>\n\n\n\n<li>Creeaz\u0103 un cache pseudorandom de 16 MB<\/li>\n\n\n\n<li>Folose\u0219te memoria cache pentru a construi un set de date de 4+ GB (DAG)<\/li>\n\n\n\n<li>Alege valori aleatorii din DAG \u00een timpul mineritului<\/li>\n\n\n\n<li>Verific\u0103 rezultatele prin memoria cache<\/li>\n<\/ul>\n\n\n\n<p>Acest design intensiv \u00een memorie ajut\u0103 Ethereum s\u0103 men\u021bin\u0103 timpii de blocare \u00een jur de 12 secunde. De asemenea, \u00eempiedic\u0103 hardware-ul de minerit s\u0103 devin\u0103 prea centralizat.<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"blake2b-in-zcash\">Blake2b \u00een Zcash<\/h3>\n\n\n<p>Zcash a ales algoritmul de hash Blake2b deoarece func\u021bioneaz\u0103 mai bine dec\u00e2t altele. Blake2b este mai rapid dec\u00e2t SHA-256 \u0219i SHA-512, dar la fel de sigur.<\/p>\n\n\n\n<p>Zcash folose\u0219te Blake2b \u00een sistemul s\u0103u proof-of-work Equihash. Algoritmul func\u021bioneaz\u0103 excelent pe sisteme pe 64 de bi\u021bi. Ruleaz\u0103 mai rapid dec\u00e2t MD5, SHA-1, SHA-2 \u0219i SHA-3, fiind \u00een acela\u0219i timp mai sigur.<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"comparing-security-and-performance-tradeoffs\">Compararea compromisurilor de securitate \u0219i performan\u021b\u0103<\/h3>\n\n\n<p>Aceste algoritmi echilibreaz\u0103 securitatea \u0219i performan\u021ba \u00een mod diferit. SHA-256 este fiabil \u0219i testat pe scar\u0103 larg\u0103, dar necesit\u0103 mult\u0103 putere de calcul. Ethash se concentreaz\u0103 pe men\u021binerea min\u0103rii descentralizate, dar utilizeaz\u0103 mai mult\u0103 memorie.<\/p>\n\n\n\n<p>Blake2b ar putea fi op\u021biunea cea mai echilibrat\u0103. Este rapid \u0219i sigur. Testele arat\u0103 c\u0103 algoritmii mai noi, precum Blake3, func\u021bioneaz\u0103 mai bine dec\u00e2t cei mai vechi \u00een ceea ce prive\u0219te viteza \u0219i timpul de r\u0103spuns.<\/p>\n\n\n\n<p>Alegerea algoritmului modeleaz\u0103 modul \u00een care fiecare blockchain gestioneaz\u0103 securitatea. Acesta afecteaz\u0103 aspecte precum rezisten\u021ba la echipamentele de minare, amenin\u021b\u0103rile legate de calculul cuantic \u0219i viteza de procesare a tranzac\u021biilor.<\/p>\n\n\n<h2 class=\"wp-block-heading\" id=\"realworld-security-challenges-and-hash-solutions\">Provoc\u0103ri de securitate din lumea real\u0103 \u0219i solu\u021bii hash<\/h2>\n\n\n<p>Re\u021belele blockchain se bazeaz\u0103 pe func\u021bii de hash puternice pentru securitate, dar vulnerabilit\u0103\u021bile fundamentale \u00eenc\u0103 reprezint\u0103 provoc\u0103ri pentru modelul lor de securitate. Tehnologia are nevoie de dezvoltare continu\u0103 a m\u0103surilor de combatere bazate pe hash pentru a r\u0103m\u00e2ne sigur\u0103.<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"51-attack-prevention\">Prevenirea atacului de 51%<\/h3>\n\n\n<p class=\"translation-block\">Un atac de 51% are loc atunci c\u00e2nd o entitate controleaz\u0103 mai mult de jum\u0103tate din puterea de hashing a unei re\u021bele. Atacatorii pot bloca noi tranzac\u021bii, opri pl\u0103\u021bi \u00eentre utilizatori \u0219i anula tranzac\u021biile finalizate. Bitcoin Gold a \u00eenv\u0103\u021bat asta pe cale grea. Re\u021beaua a pierdut aproximativ 18 milioane de dolari](<a href=\"https:\/\/hacken.io\/discover\/51-percent-attack\/\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/hacken.io\/discover\/51-percent-attack\/<\/a>) \u00een 2018 \u0219i a fost supus\u0103 unui alt atac \u00een 2020.<\/p>\n\n\n\n<p>Blockchain-urile mai mici nu fac fa\u021b\u0103 prea bine acestor atacuri, mai ales atunci c\u00e2nd ai o distribu\u021bie limitat\u0103 a puterii de hashing. Iat\u0103 cum s\u0103 le previi:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"translation-block\"><strong>Schimb\u0103ri ale algoritmului de consens<\/strong>: O trecere de la Proof of Work la Proof of Stake cre\u0219te semnificativ costurile atacurilor.<\/li>\n\n\n\n<li class=\"translation-block\"><strong>Confirm\u0103ri \u00eent\u00e2rziate<\/strong>: Timpul mai lung de verificare a tranzac\u021biunilor for\u021beaz\u0103 atacatorii s\u0103 men\u021bin\u0103 controlul pentru perioade mai lungi.<\/li>\n\n\n\n<li class=\"translation-block\"><strong>Contracar\u0103ri<\/strong>: Victimele pot \u00eenchiria putere de hash pentru a mina pe lan\u021bul original \u0219i a descuraja atacatorii<\/li>\n<\/ul>\n\n\n<h3 class=\"wp-block-heading\" id=\"doublespending-protection\">Protec\u021bie \u00eempotriva cheltuirii duble<\/h3>\n\n\n<p>Double-spending reprezint\u0103 o provocare fundamental\u0103 de securitate, unde utilizatorii \u00eencearc\u0103 s\u0103 cheltuiasc\u0103 aceea\u0219i criptomoned\u0103 de mai multe ori. Func\u021biile hash combinate cu mecanismele de consens ajut\u0103 la prevenirea acestei probleme.<\/p>\n\n\n\n<p>Re\u021beaua Bitcoin are o \u00eent\u00e2rziere de 10 minute la crearea blocurilor, utiliz\u00e2nd dovezi de munc\u0103 bazate pe hash. Acest lucru creeaz\u0103 o barier\u0103 temporal\u0103 care face ca dubla cheltuire s\u0103 fie greu de realizat. \u00cen ciuda acestui fapt, atacatorii folosesc metode sofisticate precum atacurile de tip race \u0219i atacurile Finney pentru a manipula procesele de confirmare.<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"quantum-computing-threats-to-current-hash-functions\">Amenin\u021b\u0103rile calculului cuantic pentru func\u021biile hash actuale<\/h3>\n\n\n<p>Calculul cuantic poate chiar reprezenta cea mai mare amenin\u021bare la adresa securit\u0103\u021bii blockchain-ului. Algoritmul lui Shor, care ruleaz\u0103 pe calculatoare cuantice puternice, ar putea sparge criptografia pe curb\u0103 eliptic\u0103 \u00een semn\u0103turile digitale. Acest lucru ar putea expune cheile private.<\/p>\n\n\n\n<p class=\"translation-block\">Algoritmul lui Grover accelereaz\u0103 procesul de rezolvare a func\u021biilor hash, cum ar fi SHA-256, de patru ori. Oamenii de \u0219tiin\u021b\u0103 cred c\u0103 calculatoarele cuantice ar putea <a href=\"https:\/\/www.deloitte.com\/nl\/en\/services\/risk-advisory\/perspectives\/quantum-computers-and-the-bitcoin-blockchain.html\" target=\"_blank\" rel=\"noreferrer noopener\">sparge cheile RSA \u00een aproximativ 8 ore<\/a>. Semn\u0103turile Bitcoin ar putea deveni vulnerabile \u00een 30 de minute.<\/p>\n\n\n\n<p>Cercet\u0103torii creeaz\u0103 solu\u021bii rezistente la cuantum pentru a aborda aceste noi amenin\u021b\u0103ri:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Criptografie bazat\u0103 pe re\u021bele care utilizeaz\u0103 zgomot matematic<\/li>\n\n\n\n<li>Criptografie bazat\u0103 pe coduri cu coduri de corectare a erorilor<\/li>\n\n\n\n<li>Metode criptografice bazate pe hash care rezist\u0103 algoritmilor cuantici<\/li>\n<\/ul>\n\n\n<h2 class=\"wp-block-heading\" id=\"conclusion\">\u00cen concluzie<\/h2>\n\n\n<p>Func\u021biile hash sunt esen\u021biale pentru securitatea blockchain-ului. Aceste mecanisme criptografice sofisticate ofer\u0103 un scut indestructibil. Propriet\u0103\u021bile de transformare unidirec\u021bional\u0103 \u0219i efectul de avalan\u0219\u0103 fac ca re\u021belele blockchain s\u0103 fie rezistente la tentativele de manipulare.<\/p>\n\n\n\n<p>Diferite platforme selecteaz\u0103 algoritmi de hash pe baza nevoilor lor pentru a men\u021bine integritatea datelor prin certitudine matematic\u0103. SHA-256 al Bitcoin, Ethash al Ethereum \u0219i Blake2b al Zcash prezint\u0103 abord\u0103ri unice care echilibreaz\u0103 securitatea cu cerin\u021bele de performan\u021b\u0103.<\/p>\n\n\n\n<p>Calculul cuantic \u0219i atacurile de 51% creeaz\u0103 provoc\u0103ri continue pentru securitatea blockchain-ului. Progresul mecanismelor de protec\u021bie bazate pe hash r\u0103m\u00e2ne esen\u021bial pentru a p\u0103stra promisiunea blockchain-ului de \u00eenregistr\u0103ri imuabile \u0219i descentralizate.<\/p>\n\n\n\n<p>Aceste concepte fundamentale ne ajut\u0103 s\u0103 \u00een\u021belegem de ce func\u021biile hash sunt s\u00e2ngele vie\u021bii tehnologiei blockchain. Aplica\u021biile blockchain se extind acum \u00een mai multe industrii, iar cadrul lor de securitate puternic va modela cu siguran\u021b\u0103 lumea noastr\u0103 digital\u0103.<\/p>","protected":false},"excerpt":{"rendered":"<p>Un hash creeaz\u0103 o amprent\u0103 digital\u0103 indestructibil\u0103 care face ca tehnologia blockchain s\u0103 fie sigur\u0103. Fiecare tranzac\u021bie \u0219i bloc din lan\u021b prime\u0219te propria semn\u0103tur\u0103 unic\u0103. Aceast\u0103 funda\u021bie digital\u0103 va da o... <a class=\"more-link\" href=\"https:\/\/securitybriefing.net\/ro\/lant-de-blocuri\/cum-contribuie-un-hash-la-securizarea-tehnologiei-blockchain\/\">Continue reading <span class=\"screen-reader-text\">Cum ajut\u0103 un hash la securizarea tehnologiei blockchain?<\/span><\/a><\/p>","protected":false},"author":3,"featured_media":3519,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-3511","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blockchain","entry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How Does A Hash Help Secure Blockchain Technology? | Security Briefing<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/securitybriefing.net\/ro\/lant-de-blocuri\/cum-contribuie-un-hash-la-securizarea-tehnologiei-blockchain\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How Does A Hash Help Secure Blockchain Technology? | Security Briefing\" \/>\n<meta property=\"og:description\" content=\"A hash creates an unbreakable digital fingerprint that makes blockchain technology secure. 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