{"id":34823,"date":"2019-10-31T22:00:35","date_gmt":"2019-10-31T19:00:35","guid":{"rendered":"https:\/\/prohoster.info\/blog\/ispolzovanie-sluchajnogo-orakula-na-primere-loterei\/"},"modified":"2019-10-31T22:00:35","modified_gmt":"2019-10-31T19:00:35","slug":"ispolzovanie-sluchajnogo-orakula-na-primere-loterei","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/administrirovanie\/ispolzovanie-sluchajnogo-orakula-na-primere-loterei","title":{"rendered":"A v\u00e9letlen oracle haszn\u00e1lata a lott\u00f3 p\u00e9ld\u00e1j\u00e1n","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Egy reggel r\u00e1bukkantam egy cikkre, ami a ellen\u0151rz\u00f6tt v\u00e9letlensz\u00e1m-gener\u00e1torokr\u00f3l<\/a><\/noindex> a Waves platform blokkl\u00e1nc\u00e1n. <\/p>\n

Az \u00e1ltal\u00e1nos k\u00e9p vil\u00e1gos volt, de a konkr\u00e9t megval\u00f3s\u00edt\u00e1s m\u00f3dszere nem. K\u00f3dok, al\u00e1\u00edr\u00e1sok, mi\u00e9rt, hova, mi\u00e9rt?<\/p>\n

N\u00e9h\u00e1ny konzult\u00e1ci\u00f3 ut\u00e1n az oracle szerz\u0151j\u00e9vel siker\u00fclt \u00f6tv\u00f6zni a sorsol\u00e1s logik\u00e1j\u00e1t (PHP-ben megval\u00f3s\u00edtva) a v\u00e9letlensz\u00e1m-gener\u00e1l\u00e1si algoritmussal.
\n<\/a><\/noindex><\/p>\n

    \n
  1. A verseny\/k\u00f6r kezdetekor k\u00e9rj\u00fck az oracle-t\u00f3l a k\u00f3d els\u0151 r\u00e9sz\u00e9t (R-k\u00f3d).\n

    Ebben a pillanatban nincs inform\u00e1ci\u00f3nk sem a j\u00e1t\u00e9kosok sz\u00e1m\u00e1r\u00f3l, sem a nyerem\u00e9nyhelyek sz\u00e1m\u00e1r\u00f3l, sem a nyerem\u00e9nyek \u00f6sszeg\u00e9r\u0151l, \u00e9s egy\u00e1ltal\u00e1n a lott\u00f3 l\u00e9tez\u00e9s\u00e9r\u0151l. Az oracle tranzakci\u00f3 r\u00e9v\u00e9n egy szem\u00e9lyes v\u00e9letlen k\u00f3dot ad, amelyet k\u00e9s\u0151bb csak egyszer haszn\u00e1lhatunk fel, \u00e9s csak annak, aki k\u00e9rte. Egy\u00e9bk\u00e9nt az R-k\u00f3dot \"meg lehet venni\" (ez a tranzakci\u00f3s k\u00e9r\u00e9si k\u00f6lts\u00e9g + az oracle v\u00e1lasztranzakci\u00f3j\u00e1\u00e9rt j\u00e1r\u00f3 kompenz\u00e1ci\u00f3, ez k\u00f6r\u00fclbel\u00fcl $0,015 az aktu\u00e1lis \u00e1rfolyamon, maga a k\u00f3d ingyenes) el\u0151re, ak\u00e1r t\u00f6bb darabot is, hogy k\u00e9s\u0151bb ne kelljen v\u00e1rni a v\u00e1lasztranzakci\u00f3 meg\u00e9rkez\u00e9s\u00e9re. K\u00e9sz\u00edtettem egy kis, rendszeresen friss\u00edtett buffert az adatb\u00e1zisban.<\/li>\n

  2. A verseny standard m\u00f3don 60 blokkig tart a Waves platform blokkl\u00e1nc\u00e1n, ez jelenleg k\u00f6r\u00fclbel\u00fcl 1 \u00f3r\u00e1t jelent. A verseny akkor tekinthet\u0151 lez\u00e1rtnak, ha 60 blokk ut\u00e1n legal\u00e1bb k\u00e9t jegy van benne, k\u00fcl\u00f6nben a verseny aktivit\u00e1si ideje a k\u00f6vetkez\u0151 60 blokkra meghosszabbodik.<\/li>\n
  3. K\u00f6zvetlen\u00fcl a verseny lez\u00e1r\u00e1sa ut\u00e1n tranzakci\u00f3s adatokat gener\u00e1lunk \u00e9s k\u00fcld\u00fcnk el (ez\u00e9rt is fizet\u00fcnk egy k\u00f6r\u00fclbel\u00fcl $0,005-os d\u00edjat), ha sz\u00fcks\u00e9ges, t\u00f6bbet is, amely r\u00f6gz\u00edti az \u00f6sszes sorsol\u00e1si felt\u00e9telt \u00e9s a j\u00e1t\u00e9kosok (jegyek) rendezett list\u00e1j\u00e1t, amelyb\u0151l ki kell v\u00e1lasztanunk a gy\u0151zteseket.<\/li>\n
  4. Ez id\u0151 t\u00e1jt m\u00e1r rendelkezn\u00fcnk kell az R-k\u00f3d els\u0151 r\u00e9sz\u00e9vel plusz a tranzakci\u00f3s adat ID-val (TXID). Ezeket az oracle-nak k\u00fcldj\u00fck al\u00e1\u00edr\u00e1sra a concaten\u00e1ci\u00f3 form\u00e1j\u00e1ban (R-k\u00f3d + TXID), ism\u00e9t d\u00edjat + kompenz\u00e1ci\u00f3t fizetve. Az oracle ellen\u0151rzi az adatokat az egyedis\u00e9g \u00e9s tulajdonjog szempontj\u00e1b\u00f3l, majd v\u00e1laszk\u00e9nt k\u00fcldi el nek\u00fcnk a k\u00f3d m\u00e1sodik r\u00e9sz\u00e9t (S-k\u00f3d), amely sha256 form\u00e1tumban tal\u00e1lhat\u00f3, \u00e9s ez lesz az alapja a v\u00e9letlensz\u00e1m-gener\u00e1tornak.<\/li>\n
  5. A v\u00e9letlensz\u00e1m megkap\u00e1s\u00e1hoz, amely a nyertes jegy sorsz\u00e1m\u00e1t jel\u00f6li, a S-k\u00f3dot bin\u00e1ris adatb\u00f3l sha256 hexadecim\u00e1lis (HEX) reprezent\u00e1ci\u00f3ra alak\u00edtjuk \u00e1t. Az \u00edgy kapott HEX sztringb\u0151l sz\u00e1mot nyer\u00fcnk. Az eredm\u00e9ny\u00fcl kapott sz\u00e1mot a jegyek sz\u00e1m\u00e1val (all_tickets) osztva kapott marad\u00e9khoz 1-et adunk (hogy 1-et kapjunk all_tickets-ig). V\u00e9g\u00fcl megkapjuk a nyertes sorsz\u00e1m\u00e1t.<\/li>\n
  6. Ha a sorsol\u00e1s felt\u00e9telei szerint t\u00f6bb nyertes van, akkor a kor\u00e1bbi m\u0171veleteket annyiszor ism\u00e9telj\u00fck meg, ah\u00e1ny nyerem\u00e9ny hely van. Minden alkalommal elt\u00e1vol\u00edtjuk a nyertes list\u00e1b\u00f3l a m\u00e1r nyert jegyet, \u00e9s cs\u00f6kkentj\u00fck az all_tickets sz\u00e1mot 1-el, m\u00edg a S-k\u00f3d helyett az el\u0151z\u0151leg kapott sz\u00e1mot adjuk meg.<\/li>\n<\/ol>\n

    \nN\u00e9zz\u00fcnk meg egy konkr\u00e9t val\u00f3s p\u00e9ld\u00e1t, a 119. sz\u00e1m\u00fa torn\u00e1t:<\/p>\n

    \u00d6sszesen 7 jegy (all_tickets)
    \nA jegy \u00e1ra 50 \u00e9rme (Bet)
    \nJ\u00e1t\u00e9kos d\u00edj 10% (Fee)<\/p>\n

    A lott\u00f3 felt\u00e9telei szerint a 30% nyerem\u00e9nybe ker\u00fcl, teh\u00e1t ebben az esetben 2 jegynek kell nyernie, aminek m\u00e9rt\u00e9ke a k\u00f6vetkez\u0151 k\u00e9plet seg\u00edts\u00e9g\u00e9vel sz\u00e1molhat\u00f3: (Bet*all_tickets-Fee) \/ 2.<\/p>\n

    1. Megkaptuk az R-k\u00f3dot: RdbAiAhKhveAtR4eyTKq75noMxdcEoxbE6BvojJjM13VE<\/a><\/noindex><\/p>\n

    2. A torna lez\u00e1r\u00e1sa ut\u00e1n a jegyek list\u00e1j\u00e1t p\u00e1rok form\u00e1j\u00e1ban kapjuk meg: sz\u00e1m + c\u00edm (az a p\u00e9nzt\u00e1rca c\u00edme, ahonnan a torn\u00e1ra val\u00f3 r\u00e9szv\u00e9tel\u00e9rt a d\u00edjat kifizett\u00e9k). \u00c9rdemes megjegyezni, hogy a c\u00edmek ism\u00e9tl\u0151dhetnek, ez azt jelenti, hogy egy r\u00e9sztvev\u0151 t\u00f6bb jegyet v\u00e1s\u00e1rolt egy torn\u00e1ra, ami a szab\u00e1lyok szerint megengedett.<\/p>\n

    K\u00fcldt\u00fck a tranzakci\u00f3 d\u00e1tum\u00e1t: 82JTMzhHM5xEA2fQ9Qscd5QAJU3DAd8nShLjdVHTer5S<\/a><\/noindex><\/p>\n

    3. K\u00e9rt\u00fck az S-k\u00f3dot: FTF3uRyaa4F2uAyD6z5a3CNbTXbQLc7fSR6CFNVjgZYV<\/a><\/noindex> megjegyz\u00e9ssel (R-k\u00f3d + TXID):
    \nRdbAiAhKhveAtR4eyTKq75noMxdcEoxbE6BvojJjM13VE 82JTMzhHM5xEA2fQ9Qscd5QAJU3DAd8nShLjdVHTer5S<\/p>\n

    4. Megkaptuk az S-k\u00f3dot: Ri89jHB4UXZDXY6gT1m4LBDXGMTaYzHozMk4nxiuqVXdC<\/a><\/noindex><\/p>\n

    5. Meghat\u00e1roztuk a nyerteseket.<\/p>\n

    6. K\u00fcldt\u00fck a kifizet\u00e9seket<\/a><\/noindex><\/p>\n

    Eredm\u00e9nyek\u00e9nt l\u00e9p\u00e9sr\u0151l l\u00e9p\u00e9sre r\u00f6gz\u00edtj\u00fck a nyerem\u00e9nyj\u00e1t\u00e9k folyamat\u00e1t a blokkl\u00e1ncon, amit b\u00e1rmikor ellen\u0151rizhet\u00fcnk. A szervez\u0151 r\u00e9sz\u00e9r\u0151l a tal\u00e1latok manipul\u00e1l\u00e1sa gyakorlatilag lehetetlen, legal\u00e1bbis \u00e9szrev\u00e9tlen\u00fcl m\u00e1r nem fog siker\u00fclni.<\/p>\n

    hat\u00e1rozza meg a gy\u0151ztest \u2116 1\n\nMinden_jegyek:\nIndex: 1 Jegy:139\nIndex: 2 Jegy:141\nIndex: 3 Jegy:143\nIndex: 4 Jegy:145\nIndex: 5 Jegy:147\nIndex: 6 Jegy:149\nIndex: 7 Jegy:151\n\n1. bin -> hex ( bin2hex(sha256(S-k\u00f3d)) ): Ri89jHB4UXZDXY6gT1m4LBDXGMTaYzHozMk4nxiuqVXdC -> 0xdaf5802953dcb27f89972e38e8900b898733f6a613e6e1c6c5491362c1832596\n\n2. hex -> gmp sz\u00e1m: 0xdaf5802953dcb27f89972e38e8900b898733f6a613e6e1c6c5491362c1832596 -> 99037963059744689166154019807924045947962565922868104113173478160267437352342\n\n3. gmp -> modulo (mod=7): 99037963059744689166154019807924045947962565922868104113173478160267437352342 -> 4\n\n4. modulo -> jegy: 4 -> 145\n\nhat\u00e1rozza meg a gy\u0151ztest \u2116 2\n\nMinden_jegyek:\n\nIndex: 1 Jegy:139\nIndex: 2 Jegy:141\nIndex: 3 Jegy:143\nIndex: 4 Jegy:147\nIndex: 5 Jegy:149\nIndex: 6 Jegy:151\n\n1. bin -> hex ( bin2hex(sha256(el\u0151z\u0151 hex)) ): daf5802953dcb27f89972e38e8900b898733f6a613e6e1c6c5491362c1832596 -> 0x9560e77525e9ea2db92cdb8484dc52046ccafac7c719b8859ff55f0eb92834a0\n2. hex -> gmp sz\u00e1m: 0x9560e77525e9ea2db92cdb8484dc52046ccafac7c719b8859ff55f0eb92834a0 -> 67565829218838067182838043983962684143266386786567427968312120473742580659360\n3. gmp -> modulo (mod=6): 67565829218838067182838043983962684143266386786567427968312120473742580659360 -> 1\n4. modulo -> jegy: 1 -> 139\n\nV\u00e9ge.<\/code><\/pre>\n
    Forr\u00e1s: habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"
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\u0442\u0443\u0440\u043d\u0438\u0440\u0430\/\u0440\u0430\u0443\u043d\u0434\u0430 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-34823","post","type-post","status-publish","format-standard","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47A v\u00e9letlen oracle haszn\u00e1lata p\u00e9ldak\u00e9nt a lott\u00f3ra | ProHoster","description":"Egy reggel a szemembe akadt egy cikk a Waves platform blokkl\u00e1nc\u00e1n ellen\u0151rz\u00f6tt 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