{"id":912,"date":"2009-01-22T00:48:39","date_gmt":"2009-01-21T22:48:39","guid":{"rendered":"http:\/\/vaxxi.net\/log\/?p=912"},"modified":"2017-01-31T16:04:29","modified_gmt":"2017-01-31T14:04:29","slug":"solutii-pentru-intimitate-pe-internet","status":"publish","type":"post","link":"https:\/\/vaxxi.net\/log\/solutii-pentru-intimitate-pe-internet\/","title":{"rendered":"solu\u0163ii pentru intimitate pe Internet"},"content":{"rendered":"

Titlu alternativ: sfaturi despre cum s\u0103 scapi de legea intercept\u0103rii telefoanelor \u015fi emailurilor. <\/em><\/p>\n

\n

Se tot face tam-tam maxim pe subiectul recent al oblig\u0103rii furnizorilor de servicii de comunica\u0163ii (telefoane, sms-uri, Internet) s\u0103 p\u0103streze jurnale detaliate despre serviciile folosite de clien\u0163i, d\u00e2nd na\u015ftere unei explozii de paranoia pe tema “a revenit securitatea”. Ce nu \u015ftie toat\u0103 lumea este c\u0103 oricum chestia asta se f\u0103cea de mult\u0103 vreme neoficial (\u00een termeni tehnici, batista pe \u0163ambal<\/em>), \u015fi c\u0103 e relativ u\u015for s\u0103 stochezi ce te intereseaz\u0103.<\/p>\n

Un SMS are cam 200 bytes (s\u0103 zicem 160 bytes corpul mesajului, de\u015fi e codat ASCII pe doar 7 bytes, plus 40 bytes pentru num\u0103rul p\u0103r\u0163ilor implicate \u015fi un ID de control). Un HDD de 1 terabyte e vreo 100 euro, \u015fi poate stoca 1\u00c2\u00a0099\u00c2\u00a0511\u00c2\u00a0627\u00c2\u00a0776 bytes, adic\u0103 vreo 5 miliarde de SMS-uri. Un minut de sunet codat cu un codec bun de voce dedicat (s\u0103 zicem G.711) \u00eenregistreaz\u0103 la 64 kilobits pe secund\u0103, deci 8 kilobytes pe secund\u0103, a\u015fadar acela\u015fi HDD de mai sus poate stoca 134217728 secunde de voce, adic\u0103 2236962 minute, adic\u0103 37282 ore, adic\u0103 1553 de zile, adic\u0103 4.25 ani de convorbire non-stop. Deci, piece of cake, c\u0103 doar noi pl\u0103tim toate HDD-urile alea prin factur\u0103.<\/p>\n

\u00cen fine, personal m\u0103 \u00eendoiesc c\u0103 cei care-au dat legea asta s-au g\u00e2ndit \u015fi c\u0103 e nevoie de mul\u0163i oameni pricepu\u0163i \u015fi o groaz\u0103 de resurse pentru a realiza asta … dar \u00een fine, opinii \u015fi \u00eendoieli personale care nu merit\u0103 discutate. Ce vroiam eu s\u0103 expun aici este un mic arsenal de solu\u0163ii pentru asigurarea intimit\u0103\u0163ii \u00een comunicare: unelte gratuite \u015fi la \u00eendem\u00e2na oricui.<\/p>\n

1. Criptarea e-mailului<\/strong> – definitiv, PGP (utilizabil cu PGP<\/a> al lui Zimmerman sau GNU Privacy Guard<\/a>). Se instaleaz\u0103, \u015fi se genereaz\u0103 o pereche de chei de criptare: una e privat\u0103 \u015fi trebuie s\u0103 ave\u0163i mare grij\u0103 de ea, una e public\u0103 \u015fi poate fi trimis\u0103 oriunde \u015fi oricui \u00een lume. Cel care dore\u015fte s\u0103 v\u0103 trimit\u0103 un mesaj criptat folose\u015fte cheia public\u0103, \u015fi numai cine posed\u0103 cheia secret\u0103 (v-am zis c\u0103 trebuie s\u0103 ave\u0163i grij\u0103 de ea) poate decoda mesajul. O cheie de 1024 bi\u0163i e suficient\u0103 pentru lucruri triviale (ar dura c\u00e2\u0163iva zeci de ani \u015fi resurse uria\u015fe de calcul ca cineva s\u0103 “for\u0163eze” decriptarea prin \u00eencerc\u0103ri), 2048 bi\u0163i este de nivel militar, iar 4096 bi\u0163i este considerat\u0103 impenetrabil\u0103.<\/p>\n

2. Navigare anonim\u0103<\/strong> – prin TOR<\/a>. TOR este g\u00e2ndit \u00eempotriva analizei de trafic, \u015fi folose\u015fte \u00eentreaga re\u0163ea a celor care au instalat acest program pentru a distribui aleator pachetele de date prin re\u0163ea, ele fiind reasamblate la destinatar. Un nod intermediar aflat \u00eentre expeditor \u015fi destinatar (cum ar fi furnizorul de servicii Internet) nu poate ghici con\u0163inutul \u015fi destina\u0163ia real\u0103 a pachetelor, ele fiind \u00eempr\u0103\u015ftiate \u00een toate direc\u0163iile.<\/p>\n

3. Ascunderea de mesaje \u00een fi\u015fiere “clare” – <\/strong>se nume\u015fte steganografie. O list\u0103 de programe g\u0103si\u0163i aici<\/a>. Ideea de baz\u0103 este ascunderea unui text (nu foarte lung) \u00eentr-un alt fi\u015fier (de obicei o imagine) prin alterarea c\u00e2torva elemente (c\u00e2\u0163iva pixeli) imposibil de detectat cu ochiul liber.<\/p>\n

4. VoIP criptat – <\/strong>voce criptat\u0103, transportat\u0103 prin Internet. Articolul \u015fi solu\u0163iile aici<\/a>.<\/p>\n

5. SMSuri criptate – <\/strong>din p\u0103cate, nimic gratuit p\u00e2n\u0103 acum … dar pute\u0163i folosi aespipe<\/a>.<\/p>\n

6. Date criptate – <\/strong>TrueCrypt<\/a>, genereaz\u0103 un disc virtual care poate fi stocat \u00eentr-un fi\u015fier sau pe o parti\u0163ie \u00eentreag\u0103, \u00een care datele sunt criptate transparent (la fel ca un HDD normal).<\/del><\/p>\n

TrueCrypt nu mai exista – variante alternative se pot gasi aici<\/a>.<\/p>\n

Benjamin Franklin zicea: cei care renun\u0163\u0103 la libertate pentru siguran\u0163\u0103, nu merit\u0103 nici una dintre ele. Spor la treab\u0103.<\/p>\n","protected":false},"excerpt":{"rendered":"

Titlu alternativ: sfaturi despre cum s\u0103 scapi de legea intercept\u0103rii telefoanelor \u015fi emailurilor. Se tot face tam-tam maxim pe subiectul recent al oblig\u0103rii furnizorilor de servicii de comunica\u0163ii (telefoane, sms-uri, Internet) s\u0103 p\u0103streze jurnale detaliate despre serviciile folosite de clien\u0163i, d\u00e2nd na\u015ftere unei explozii de paranoia pe tema “a revenit securitatea”. Ce nu \u015ftie toat\u0103…(Continue Reading)<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7,13],"tags":[185],"class_list":["post-912","post","type-post","status-publish","format-standard","hentry","category-gadgets","category-ganduri","tag-ganduri"],"yoast_head":"\nsolu\u0163ii pentru intimitate pe Internet<\/title>\n<meta name=\"description\" content=\"Titlu alternativ: sfaturi despre cum s\u0103 scapi de legea intercept\u0103rii telefoanelor \u015fi emailurilor. 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