{"id":687,"date":"2015-12-11T15:35:19","date_gmt":"2015-12-11T14:35:19","guid":{"rendered":"http:\/\/undetec.com\/blog\/?p=687"},"modified":"2018-11-13T22:00:57","modified_gmt":"2018-11-13T21:00:57","slug":"com-crear-passwords-segurs-i-facils-de-recordar","status":"publish","type":"post","link":"https:\/\/www.undetec.com\/blog\/com-crear-passwords-segurs-i-facils-de-recordar\/","title":{"rendered":"Com crear passwords segurs i f\u00e0cils de recordar"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-689 size-full\" src=\"\/\/www.undetec.com\/blog\/wp-content\/uploads\/2015\/03\/cranor.png\" alt=\" cranor - com crear passwords segurs i f\u00e0cils de recordar\" width=\"600\" height=\"190\" srcset=\"https:\/\/www.undetec.com\/blog\/wp-content\/uploads\/2015\/03\/cranor.png 600w, https:\/\/www.undetec.com\/blog\/wp-content\/uploads\/2015\/03\/cranor-300x95.png 300w\" sizes=\"auto, (max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 984px) 61vw, (max-width: 1362px) 45vw, 600px\" \/><\/p>\n<p>La xerrada de <a href=\"\/\/lorrie.cranor.org\/\">Lorrie Faith Cranor <\/a>\u00a0em va fer pensar com crear passwords segurs i f\u00e0cils de recordar. La xerrada &#8220;<a href=\"\/\/www.ted.com\/talks\/lorrie_faith_cranor_what_s_wrong_with_your_pa_w0rd\">What\u2019s wrong with your pa$$w0rd?<\/a>&#8221;\u00a0la va fer al mar\u00e7 de 2014 a <a href=\"\/\/www.ted.com\/talks\">TED Talks<\/a>.<\/p>\n<p><!--more--><\/p>\n<p><iframe loading=\"lazy\" src=\"https:\/\/embed-ssl.ted.com\/talks\/lang\/es\/lorrie_faith_cranor_what_s_wrong_with_your_pa_w0rd.html\" width=\"640\" height=\"360\" frameborder=\"0\" scrolling=\"no\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\n<p>Recullo varies idees interessants sobre la xerrada que vull que serveixin per crear passwords segurs i f\u00e0cils de recordar.<\/p>\n<ul>\n<li>Millor apuntar les claus amb un Post-it a la pantalla que memoritzar una sola clau i utilitzar-la a varis llocs.<\/li>\n<li>Que no \u00e9s una bona idea tenir que utilitzar claus del tipus &#8220;<strong>TkejJ,kQp3<\/strong>&#8220;. Si nom\u00e9s tingu\u00e9ssim una sola clau, encara. Amb la quantitat de \u00a0claus que faig anar, les d&#8217;aquest tipus, no s\u00f3n f\u00e0cils de recordar.<\/li>\n<li>Busquem claus segures! Nom\u00e9s han de complir que siguin llarges amb un conjunt de car\u00e0cters el m\u00e9s gran possible(lletres maj\u00fascules, lletres min\u00fascules, n\u00fameros i s\u00edmbols) i que no siguin de diccionari. \u00a0\u00a0En cap lloc est\u00e0 escrit que per tenir un password segur ha de ser dif\u00edcil de recordar.<\/li>\n<\/ul>\n<p><a href=\"\/\/undetec.com\/blog\/wp-content\/uploads\/2015\/03\/cranor1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-692 size-thumbnail\" title=\"cranor\" src=\"\/\/www.undetec.com\/blog\/wp-content\/uploads\/2015\/03\/cranor1-150x150.jpg\" alt=\"cranor - com crear passwords segurs i f\u00e0cils de recordar\" width=\"150\" height=\"150\" \/><\/a>La Lorrie Faith Cranor va fer imprimir sobre un edred\u00f3 els 1000 passwords robats m\u00e9s usats del lloc web <a href=\"https:\/\/rockyou.com\/\">RockYou<\/a>. La mida dels passwords es proporcional a la freq\u00fc\u00e8ncia amb que apareixien al conjunt de dades robades. Encara que l&#8217;estudi s&#8217;ha fet amb passwords de angloparlants, haig de recon\u00e8ixer que ja he identificat alguns dels passwords que utilitzo en certs llocs. Vaja!, vaig a canviar els passwords ara mateix&#8230; Com ho haig de fer per no prendre mal?<\/p>\n<p>Anem a analitzar primer quins passwords tinc!<\/p>\n<p>B\u00e0sicament en tenia quatre de tota la vida, per llocs importants un, per llocs no fiables i per coses banals un altre. Alguns que per les regles del lloc havia de ser d&#8217;una mida i caracter\u00edstiques especials. I S\u00ed, \u00e9s veritat! Tenia el password <strong>1234<\/strong> \u00a0per entrar a alguns llocs.<\/p>\n<p>He de trobar una manera que em sigui f\u00e0cil recordar els passwords!\u00a0Per poder recordar els passwords tinc dues maneres.<\/p>\n<p>Construccions de paraules sense sentit a partir de paraules amb sentit. Per exemple: &#8220;<strong>cavallpletornacalaix<\/strong>&#8221; afegint n\u00fameros , signes i maj\u00fascules amb algun patr\u00f3 establert quant aix\u00ed em sigui requerit pel propi lloc on vull accedir. &#8220;<strong>c\/avalL12P\/lE13t\/ornA14c\/alaiX<\/strong>&#8221;<\/p>\n<p>O que sonin be per recordar: &#8220;<strong>etacapotat<\/strong>&#8221; Canviant algunes per maj\u00fascules(per exemple la &#8220;<strong>T<\/strong>&#8221;\u00a0 &#8220;<strong>eTacapoTaT<\/strong>&#8221;\u00a0i si \u00e9s vol algun s\u00edmbol i algun n\u00famero&#8230; &#8220;<strong>eTa_2005capoTaT<\/strong>&#8220;. A partir d&#8217;aqu\u00ed canviar un petit patr\u00f3 a cada nova clau que necessitem!\u00a0Per exemple, primera i \u00faltima lletra de lloc a on volem accedir i insertar-ho sempre en alguna posici\u00f3:<\/p>\n<ul>\n<li>youtube(<strong>ye<\/strong>): \u00a0<strong>eTa_2ye005capoTaT<\/strong><\/li>\n<li>gmail(<strong>gl<\/strong>): \u00a0<strong>eTa_2gl005capoTaT<\/strong><\/li>\n<li>Twitter(<strong>tr<\/strong>):\u00a0<strong>eTa_2tr005capoTaT<\/strong><\/li>\n<\/ul>\n<p>I si primer escrivim <strong>eTacapoTaT<\/strong> despr\u00e8s movem el cursor \u00a08 posicions o millor amb el ratol\u00ed i escrivim\u00a0<strong>_2ye005<\/strong> per accedir al youtube, evitem possibles\u00a0 <a href=\"\/\/www.portalprogramas.com\/gratis\/keylogger-captura-contrase%C3%B1as\">Keylogger<\/a>. El Keylogger \u00a0haur\u00e0 captat <strong>eTaTocapoTaT_2ye005<\/strong> i nosaltres haur\u00edem escrit \u00a0<strong>eTa_2ye005capoTaT<\/strong>. B\u00e9! aix\u00f2 \u00e9s per si estem obsessionats amb la seguretat<\/p>\n<p>Els llocs on es guarden els passwords n&#8217;hi ha de dues classes. Els que guarden el password tal qual i els que guarden el <a href=\"https:\/\/ca.wikipedia.org\/wiki\/Funci%C3%B3_hash\">HASH<\/a>\u00a0del password. Els llocs que guarden el password tal qual \u00a0haurien d&#8217;estar prohibits i mai accedir-hi. \u00a0S\u00f3n en aquests llocs on millor crear una altre contrasenya amb patr\u00f3 diferent \u00a0per cada lloc dubt\u00f3s. En el cas dels que guarden un HASH, doncs no hi ha problema utilitzar \u00a0el tipus de password on canvia poca cosa de un lloc a un altre. Encara que canvi\u00ef poca cosa al password, el HASH ser\u00e0 totalment diferent i no aportar\u00e0 cap informaci\u00f3 que pugui servir per esbrinar el patr\u00f3 utilitzat en l&#8217;altre.<\/p>\n<p>El HASH \u00e9s f\u00e0cil de generar i te dues propietats que fa que sigui un bon sistema pels passwords:<\/p>\n<ol>\n<li>A partir d&#8217;un HASH d&#8217;un password \u00e9s impossible trobar el password. Funci\u00f3 unidireccional.<\/li>\n<li>Una petita modificaci\u00f3 del password genera un HASH diferent.<\/li>\n<\/ol>\n<p>Per autenticar-te es genera el HASH de la clau i es compara amb el HASH guardat. Si \u00e9s el mateix doncs usuari autenticat!<\/p>\n<p>He fet un petit programa per generar el HASH de qualsevol paraula. Amb aquest programa es pot provar les propietats del hash.<\/p>\n<script type=\"text\/javascript\" src=\"https:\/\/www.undetec.com\/mapcam\/javascript\/hash.js\"><\/script>\nPassword: <input type=\"text\" name=\"missatge\" id=\"missatge\"  value=\"etacapotat\" maxlength=\"30\" size=\"30\" aria-required=\"true\" required=\"required\" style=\"margin-bottom:0;display:inline;font-size: 12px;width: 350px;\" \/><br \/>\n<input type=\"button\" value=\"Crea Hash (md5)\" onClick=\"resultathash(document.getElementById('missatge').value)\">\n<input type=\"text\"  name=\"reshash\" id=\"reshash\" maxlength=\"30\" size=\"30\" style=\"margin-bottom:0;display:inline;font-size: 12px;width: 350px;\" \/>\n<p>He estat buscant i no he trobat cap lloc web que generi un\u00a0password que sigui f\u00e0cil de recordar i\u00a0que em serveixi de base per als meus passwords. N&#8217;hi ha un munt que el que fan \u00e9s generar passwords que no hi ha manera de poder recordar:<\/p>\n<ul>\n<li><a href=\"\/\/password.es\/\">password.es\/<\/a><\/li>\n<li><a href=\"\/\/passwordsgenerator.net\/\">passwordsgenerator.net\/<\/a><\/li>\n<li><a href=\"\/\/strongpasswordgenerator.com\/\">https:\/\/strongpasswordgenerator.com\/<\/a><\/li>\n<li><a href=\"\/\/www.techzoom.net\/Tools\/PasswordGenerator\">www.techzoom.net\/Tools\/PasswordGenerator<\/a><\/li>\n<\/ul>\n<p>Tots aquests llocs b\u00e0sicament fan anar una funci\u00f3 javascript que simplificada queda aix\u00ed:<\/p>\n<pre class=\"default prettyprint prettyprinted\"><code><span class=\"pun\">function creapassword(llargada) {\n\u00a0\u00a0\u00a0 var retVal\u00a0 = \"\";\n\u00a0\u00a0\u00a0 var charset = \"abcdefghijklnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789\";\n\u00a0\u00a0\u00a0 var n = charset.length;\n\u00a0\u00a0\u00a0 for (i=0;i&lt;llargada;i++) {\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 retVal += charset.charAt(Math.floor(Math.random() * n));\n\u00a0\u00a0\u00a0 }\n\u00a0\u00a0\u00a0 return retVal;\n}\n<\/span><\/code><\/pre>\n<p>El resultat del qual es pot provar clicant al bot\u00f3:<\/p>\n<script type=\"text\/javascript\" src=\"https:\/\/www.undetec.com\/mapcam\/javascript\/passwords.js\"><\/script>\n<input type=\"button\" value=\"Crea Password\" onClick=\"resultat(document.getElementById('llargada').value)\" \/>&nbsp;&nbsp;Llargada Password: <input type=\"text\" name=\"llargada\" id=\"llargada\"  value=\"10\" maxlength=\"3\" size=\"3\" aria-required=\"true\" required=\"required\" style=\"margin-bottom:0;display:inline;font-size: 12px;width: 50px;\" \/><br \/>\n<input type=\"text\"  name=\"res\" id=\"res\" \/>\n<p>Amb una mica d&#8217;imaginaci\u00f3 \u00e9s pot modificar el codi per tal que doni passwords que siguin f\u00e0cils de recordar, que siguin segurs i que compleixin els requisits que actualment estan m\u00e9s o menys establerts.<\/p>\n<ul>\n<li>Que tinguin s\u00edmbols: <strong>@<\/strong><\/li>\n<li>Que hi hagi barreja de maj\u00fascules i min\u00fascules: <strong>@Ab<\/strong><\/li>\n<li>Que hi hagi n\u00fameros: <strong>@Ab2<\/strong><\/li>\n<li>Que tingui una llargada de 8 car\u00e0cters com a m\u00ednim: <strong>@Ab2@Ab2<\/strong><\/li>\n<li>Que no siguin paraules de diccionari, ni referents al lloc on volem ficar la clau.<\/li>\n<\/ul>\n<p>Sembla dif\u00edcil, que amb aquests requeriments, trobem una manera autom\u00e0tica de generar tants passwords com vulguem i que siguin segurs i f\u00e0cils de recordar.<\/p>\n<p>Anem a veure que surt!<\/p>\n<p>Per comen\u00e7ar vull establir uns criteris sobre els criteris establerts que facin f\u00e0cil aquesta tasca.<\/p>\n<ul>\n<li>Els n\u00fameros que surtin al password vull que estiguin junts i que siguin entre <strong>11<\/strong> i <strong>99<\/strong> sense zeros. Per poder associar el n\u00famero que em doni a un any. \u00a082 &#8211;&gt; 1982 (mundial de futbol).<\/li>\n<li>Decideixo que les vocals estaran en min\u00fascules i les Consonants en maj\u00fascules.<\/li>\n<li>El conjunt de car\u00e0cters vull que sigui aquest: <strong>aBCDeFGiKLMNoPRSTuXZ<\/strong>. Decideixo treure la <strong>Q<\/strong>, <strong>W<\/strong>, <strong>Y<\/strong>, <strong>H<\/strong>, <strong>J<\/strong> i la <strong>V<\/strong>. Crec que el password ser\u00e0 mes llegible.<\/li>\n<li>Els s\u00edmbols vull que siguin aquests: <strong>_ $ # @ &amp; %<\/strong><\/li>\n<li>Necessito que tingui unes petites normes morfol\u00f2giques:<\/li>\n<\/ul>\n<ol>\n<li style=\"list-style-type: none\">\n<ol>\n<li style=\"padding-left: 30px;\">Comen\u00e7ar\u00e0 amb vocal o Consonant.<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<ol>\n<li style=\"list-style-type: none\">\n<ol>\n<li style=\"padding-left: 30px;\">Si davant hi ha una vocal puc ficar qualsevol\u00a0 car\u00e0cter: <strong>aBCDeFGiKLMNoPRSTuXZ<\/strong>.<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<ol>\n<li style=\"list-style-type: none\">\n<ol>\n<li style=\"padding-left: 30px;\">Si davant hi ha una Consonant puc ficar una vocal: <strong>aeiou<\/strong>.<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<ol>\n<li style=\"list-style-type: none\">\n<ol>\n<li style=\"padding-left: 30px;\">Si davant hi ha la consonant <strong>B<\/strong>, <strong>C<\/strong>, <strong>F<\/strong>, <strong>G<\/strong> o <strong>P<\/strong> puc ficar una vocal (<strong>aeiou<\/strong>) o una <strong>R<\/strong> o <strong>L<\/strong>.<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<ol>\n<li style=\"list-style-type: none\">\n<ol>\n<li style=\"padding-left: 30px;\">Si el password \u00e9s llarg vull que em separi alguna s\u00edl\u00b7laba amb un dels s\u00edmbols.<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<ol>\n<li style=\"padding-left: 30px;\">El n\u00famero vull que porti un s\u00edmbol davant i que serveixi per separar s\u00edl\u00b7labes o al final dels password per una major llegibilitat.<\/li>\n<\/ol>\n<p>Tots aquests criteris ficats a un programa amb javascript queden aix\u00ed:<\/p>\n<pre class=\"default prettyprint prettyprinted\"><code><span class=\"pun\">function creapasswordOK(llargada) {\n    var r      = \"\";  \/\/retorn\n    var aTot   = \"BDMaBCDeFGiKLMNoPRSTuXZ\";  \/\/ menys Q W Y H J V\n    var aVoc   = \"aeiou\"; \n    var aVocRL = \"RLaeiou\";\n    var aNum   = \"123456789\";  \n    var sig    = \"_$#@&amp;%\";  \n    var bCon   = false;  \n    var bVolRL = false;  \n    var nTot   = aTot.length;\n    var nVoc   = aVoc.length;\n    var nVocRL = aVocRL.length;\n    var nsig   = sig.length;\n    var bsig   = true;\n    var bmig   = Math.floor(Math.random() * 2);  \/\/ 0  o 1\n    var i =0;\n    while (i&lt;llargada) { if (i==0) { r += aTot.charAt(Math.floor(Math.random() * nTot)); if ((r[i]=='a') || (r[i]=='e') || (r[i]=='i') || (r[i]=='o') || (r[i]=='u')) bCon=false; else bCon=true; if ((r[i]=='B') || (r[i]=='C') || (r[i]=='F') || (r[i]=='G') || (r[i]=='P')) bVocRL=true; else bVocRL=false; } if (i&gt;0) {\n        if (bCon) {\n          if (bVocRL) {\n            r += aVocRL.charAt(Math.floor(Math.random() * nVocRL));\n          } else {\n            r += aVoc.charAt(Math.floor(Math.random() * nVoc));\n          }  \n        } else {\n          if (bsig &amp;&amp; i&gt;3 &amp;&amp; i&lt;llargada-3){\n            if (bmig) {\n              r += sig.charAt(Math.floor(Math.random() * nsig));\n              r += aNum.charAt(Math.floor(Math.random() * aNum.length));\n              r += aNum.charAt(Math.floor(Math.random() * aNum.length));\n              bsig=false;\n              i=i+3;\n            } else {\n              r += sig.charAt(Math.floor(Math.random() * nsig));\n              bsig=false;\n              i++;\n            }\n           }  \n          r += aTot.charAt(Math.floor(Math.random() * nTot));\n        }\n      }  \n      if (i==(llargada-4) &amp;&amp; bmig==false) {\n        r += sig.charAt(Math.floor(Math.random() * nsig));\n        r += aNum.charAt(Math.floor(Math.random() * aNum.length));\n        r += aNum.charAt(Math.floor(Math.random() * aNum.length));\n        i=i+3;\n      }\n        bCon=false;bVocRL=false;  \/\/ per quant hi ha signe.\n        if ((r[i]=='a') || (r[i]=='e') || (r[i]=='i') || (r[i]=='o') || (r[i]=='u')) bCon=false;  else  bCon=true;\n        if ((i&lt;(llargada-1)) &amp;&amp; ((r[i]=='B') || (r[i]=='C') || (r[i]=='F') || (r[i]=='G') || (r[i]=='P'))) bVocRL=true; else  bVocRL=false;\n     i++; \n    }\n    return r;\n}\nfunction resultatOK(llargadaOK){\n  document.getElementById('resOK').value=creapasswordOK(llargadaOK);\n}\n\n<\/span><\/code><\/pre>\n<p>I el resultat \u00e9s pot provar tantes vegades com es vulgui aqu\u00ed mateix.<\/p>\n<!-- <script type=\"text\/javascript\" src=\"https:\/\/localhost\/ut\/mapcam\/javascript\/passwordsOK.js\"><\/script> --> \n<script type=\"text\/javascript\" src=\"https:\/\/www.undetec.com\/mapcam\/javascript\/passwordsOK.js\"><\/script> \n <input type=\"button\" value=\"Crea Password OK\" onClick=\"resultatOK(document.getElementById('llargadaOK').value)\" \/>&nbsp;&nbsp;Llargada Password: <input type=\"text\" name=\"llargadaOK\" id=\"llargadaOK\"  value=\"10\" maxlength=\"3\" size=\"3\" aria-required=\"true\" required=\"required\" style=\"margin-bottom:0;display:inline;font-size: 12px;width: 50px;\" \/><br \/>\n<input type=\"text\"  name=\"resOK\" id=\"resOK\" \/>\n<p>Exemples que m&#8217;han sortit i que s\u00f3n bons candidats per a mi:<\/p>\n<ul>\n<li><strong>TuMu$29PaD<\/strong>\u00a0 TUMU PAD\u00a0 i $29 al mig<\/li>\n<li><strong>MuDeLoC#16\u00a0<\/strong> MUDELOC\u00a0 i #16 al final<\/li>\n<li><strong>GoTu$44BaR\u00a0<\/strong> GOTU BAR i $44 al mig<\/li>\n<li><strong>KiTuCLi@83\u00a0<\/strong> KITUCLI i @83 al final<\/li>\n<li><strong>NuCeBuT_38\u00a0<\/strong> NUCEBUT i _38 al final<\/li>\n<li><strong>CoMu%94oPu\u00a0<\/strong> COMU OPU i %94 al mig<\/li>\n<li><strong>PRaNeoG%42\u00a0<\/strong> PRANEOG\u00a0 i %42 al final<\/li>\n<li><strong>MeDo@53CRu\u00a0<\/strong> MEDO CRU i @53 al mig<\/li>\n<\/ul>\n<p>Tamb\u00e9 m&#8217;han sortit passwords que no em fan el pes, per\u00f2 tampoc s\u00f3n de l&#8217;estil a: <strong>TkejJ,kQp3<\/strong>. (generat des de\u00a0 <a href=\"https:\/\/password.es\/\">https:\/\/password.es\/<\/a>)<\/p>\n<ul>\n<li><strong>Muuo%63KoX<\/strong>\u00a0 MUUOKOX i %63 al mig<\/li>\n<li><strong>XiRaKoo_89<\/strong>\u00a0\u00a0 XIRAKOO i _89 al final<\/li>\n<li><strong>CiiNuSi@13<\/strong>\u00a0 CIINUSI i @13 al final<\/li>\n<\/ul>\n<p>Que tal? Amb aquesta eina hem guanyat alguna cosa o encara s\u00f3n complicats de recordar?<\/p>\n","protected":false},"excerpt":{"rendered":"<p>La xerrada de Lorrie Faith Cranor \u00a0em va fer pensar com crear passwords segurs i f\u00e0cils de recordar. La xerrada &#8220;What\u2019s wrong with your pa$$w0rd?&#8221;\u00a0la va fer al mar\u00e7 de 2014 a TED Talks.<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6,1],"tags":[],"class_list":["post-687","post","type-post","status-publish","format-standard","hentry","category-programacio","category-unio_de_tecnologies"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Com crear passwords segurs i f\u00e0cils de recordar - UNDETEC<\/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:\/\/www.undetec.com\/blog\/com-crear-passwords-segurs-i-facils-de-recordar\/\" \/>\n<meta property=\"og:locale\" content=\"ca_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Com crear passwords segurs i f\u00e0cils de recordar - UNDETEC\" \/>\n<meta property=\"og:description\" content=\"La xerrada de Lorrie Faith Cranor \u00a0em va fer pensar com crear passwords segurs i f\u00e0cils de recordar. 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