Zingam Posted August 31, 2003 Share Posted August 31, 2003 Tova e sqvet kqm tezi, koito uploadvat golemi filove. Gledam, che chesto golemi uploadi sa pridruzheni sqs .sfv filove, tova e dobre, samo che .sfv filovete mislya, che sa praveni s programi za CRC32 checksumi, koito sa 32-bitovi. Dokolkoto mi stigat poznaniyata, tazi CRC32 proverka ima smisql samo za filove do 15Mb, toest pri filove ot 200-300-500-700Mb CRC32 checksumata e bezmislena. Za tazi cel mnogo po-dobra rabota shte vqrshi MD5 algoritqmqt, koyto e 128 bitov. Ako ste zabelyazali raznite tam image filove na Linux distribucii sa pridruzheni imenno ot .md5. Za windows ima naprimer command line tool md5sums.exe. V Unixite mozhe bi go ima vgradeno. Taka che nay-dobriyat nachin za proverka dali daden file e uploadnat ili downloadnat pravilno po nastoyashtem sa md5 sumite. Blagodarya za tqrpenieto! Link to comment Share on other sites More sharing options...
777 Posted August 31, 2003 Share Posted August 31, 2003 vsi4ko e iasno Link to comment Share on other sites More sharing options...
kicko Posted August 31, 2003 Share Posted August 31, 2003 men neshto me sumniawa towa deto crc32 bilo bezsmisleno... no ne izkluchwam wuzmojnostta da e taka. shte potursia info po wuprosa, no ti ako mojesh da postnesh edin link kade si go chel towa shte bude ulesnenie... a inache za win/dos ima edna druga interesna programka za checksumi : http://www.slavasoft.com/zip/fsum.zip 71Kb poddurja ...any of the 11 well-known and documented hash and checksum algorithms: MD2, MD5, SHA-1, SHA-2(256, 384, 512), RIPEMD-160, PANAMA, TIGER, ADLER32, CRC32; edinstwen nedostatuk che e console app Edit: Aham, prochetoh za kwo stawa duma. Znachi zashtoto bila samo 32 bita sumata, sushtestwuwala weroiatnost da ima poweche ot 1 file s edna i sushta suma... Hm, neznam, iaka matematika triabwa tuka za da se kaje dali ako faila e sus sushtia size i e corruptnat, weroiatnostta da suwpadne crc-to e goliama ili malka... Link to comment Share on other sites More sharing options...
Zingam Posted September 1, 2003 Author Share Posted September 1, 2003 Vizhdam, che si nameril obyasnenie, taka che nyama da tqrsya link s obyasnenieto. Razlikata mezhdu md5 i crc32, che pri md5 dori 1 bit da e razlichen, razlikata v checksumata shte e ogromna, dokato pri crc32 algoritqmqt ima golyama veroyatnost dvete sumi da sqvpadnat. Veselo uploadvane! Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.