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- From: šilutė
- Registered: 2006-08-25
- Posts: 35
Topic: md5()
ar galima atkoduoti duomenis uzkoduotus funkcija md5()?
- minde
- Administrator
- Offline
- Registered: 2006-06-14
- Posts: 4,003
Re: md5()
Ne. Tai yra vienkrypčio kodavimo funkcija. Galima nebent ieškoti kolizijų arba parinkinėti visus variantus.
- From: šilutė
- Registered: 2006-08-25
- Posts: 35
Re: md5()
Gal galit paaiškint kas yra kolizijos..
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- minde
- Administrator
- Offline
- Registered: 2006-06-14
- Posts: 4,003
Re: md5()
Tarkim būtų tokia situcija, kai tu ilgą slaptažodį "labai_ilgas_slaptazodis" užkoduoji su mp5() funkcija ir gauni hash'ą, tarkim "abcdef123456789abcdef123456789". Bet yra atvejų, kai tokį pat hash'ą gali turėti ir koks nors trumpas slaptažodis, tarkim "slap".
Kitaip tariant:
md5("labai_ilgas_slaptazodis") = "abcdef123456789abcdef123456789"
ir
md5("slap") = "abcdef123456789abcdef123456789"
Iš wikipedijos: In cryptography, a collision is where a cryptographic hash function returns the same hash for two different inputs (kolizija tai kai vienkryptė kodavimo funkcija skirtingiem duomenim gražina tą patį rezultatą).
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- Registered: 2015-03-21
- Posts: 1
Re: md5()
vaizduodamas rezultatus tikrini, kurį puslapį reikia atvaizduoti ir pagal tai paskaičiuoti LIMI 50 OFFSET .. reikšmę, kurią naudosi užklausoje gauti rezultatams);
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- Registered: 2006-12-04
- Posts: 309
Re: md5()
minde,
naudojant salt + pass = kolizija nelabai susidaro :)
Kiek maigyklių sudėvėjai ?
- From: šilutė
- Registered: 2006-08-25
- Posts: 35
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- minde
- Administrator
- Offline
- Registered: 2006-06-14
- Posts: 4,003
Re: md5()
Xero wrote:Dėkui už atsakymą :)
Po 4 metų...
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- From: šilutė
- Registered: 2006-08-25
- Posts: 35
Re: md5()
Woolmer wrote:vaizduodamas rezultatus tikrini, kurį puslapį reikia atvaizduoti ir pagal tai paskaičiuoti LIMI 50 OFFSET .. reikšmę, kurią naudosi užklausoje gauti rezultatams);
tema atnaujinta buvo po 9-erių metų :)
- From: šilutė
- Registered: 2006-08-25
- Posts: 35
Re: md5()
Šiandien jau ir PHP 8 išeina..
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