{"id":197,"date":"2013-07-29T11:34:00","date_gmt":"2013-07-29T11:34:00","guid":{"rendered":"https:\/\/kiencang.net\/2013\/07\/29\/dau-la-yeu-to-quan-trong-nhat-trong-mat-khau-manh\/"},"modified":"2022-03-01T09:48:50","modified_gmt":"2022-03-01T02:48:50","slug":"dau-la-yeu-to-quan-trong-nhat-trong-mat-khau-manh","status":"publish","type":"post","link":"https:\/\/kiencang.net\/dau-la-yeu-to-quan-trong-nhat-trong-mat-khau-manh\/","title":{"rendered":"\u0110\u00e2u l\u00e0 y\u1ebfu t\u1ed1 quan tr\u1ecdng nh\u1ea5t trong m\u1eadt kh\u1ea9u m\u1ea1nh?"},"content":{"rendered":"
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Ch\u00fang ta \u0111\u1ec1u bi\u1ebft m\u1eadt kh\u1ea9u mu\u1ed1n m\u1ea1nh<\/a> th\u00ec ph\u1ea3i h\u1ed9i t\u1ee5 c\u00e1c y\u1ebfu t\u1ed1 nh\u01b0: kh\u00f4ng qu\u00e1 ng\u1eafn (\u00edt nh\u1ea5t 8 k\u00fd t\u1ef1<\/i>), g\u1ed3m ch\u1eef th\u01b0\u1eddng (a, b, c.., z<\/i>), s\u1ed1 (0, 1, 2…, 9<\/i>), c\u00f3 c\u1ea3 ch\u1eef IN HOA (A, B, C,…, Z<\/i>) v\u00e0 k\u00fd t\u1ef1 \u0111\u1eb7c bi\u1ec7t (!, @, #, $, %, ^, &, *…<\/i>). Trong th\u1ef1c t\u1ebf \u00edt khi ch\u00fang ta \u0111\u1eb7t m\u1eadt kh\u1ea9u c\u00f3 \u0111\u1ee7 c\u1ea3 5 \u0111i\u1ec1u ki\u1ec7n n\u00e0y, do v\u1eady vi\u1ec7c xem x\u00e9t y\u1ebfu t\u1ed1 n\u00e0o tr\u1ee3 gi\u00fap cho m\u1eadt kh\u1ea9u nh\u1ea5t l\u00e0 \u0111i\u1ec1u r\u1ea5t quan tr\u1ecdng.<\/p>\n

Th\u1eed nghi\u1ec7m thay th\u1ebf k\u00fd t\u1ef1 trong m\u1eadt kh\u1ea9u b\u1eb1ng k\u00fd t\u1ef1 kh\u00e1c<\/h2>\n
Trong th\u1eed nghi\u1ec7m n\u00e0y, ch\u00fang ta s\u1ebd t\u1ea1o m\u1ed9t m\u1eadt kh\u1ea9u g\u1ed3m to\u00e0n ch\u1eef th\u01b0\u1eddng, c\u1ee5 th\u1ec3 t\u00f4i ch\u1ecdn m\u1eadt kh\u1ea9u: faletysu<\/b> <\/span>c\u00f3 \u0111\u1ed9 d\u00e0i 8 k\u00fd t\u1ef1 v\u00e0 kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t t\u1eeb n\u1eb1m trong t\u1eeb \u0111i\u1ec3n c\u1ee7a b\u1ea5t c\u1ee9 ng\u00f4n ng\u1eef n\u00e0o. Sau \u0111\u00f3 ch\u00fang ta \u01b0\u1edbc l\u01b0\u1ee3ng n\u1ebfu k\u1ebb hack m\u1eadt kh\u1ea9u s\u1eed d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p t\u1ea5n c\u00f4ng v\u00e9t c\u1ea1n (th\u1eed t\u1ea5t c\u1ea3 m\u1ecdi tr\u01b0\u1eddng h\u1ee3p) th\u00ec s\u1ed1 l\u01b0\u1ee3ng l\u1ea7n m\u00e0 h\u1eafn ph\u1ea3i th\u1ef1c hi\u1ec7n l\u00e0 bao nhi\u00eau?<\/div>\n
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Con s\u1ed1 th\u1eed c\u00e0ng l\u1edbn s\u1ebd khi\u1ebfn k\u1ebb t\u1ea5n c\u00f4ng c\u00e0ng v\u1ea5t v\u1ea3, v\u00e0 kh\u1ea3 n\u0103ng ch\u1ed1ng t\u1ea5n c\u00f4ng c\u1ee7a m\u1eadt kh\u1ea9u \u0111\u00f3 c\u00e0ng t\u1ed1t…T\u00f4i d\u00f9ng trang\u00a0https:\/\/www.grc.com\/haystack.htm<\/a>\u00a0\u0111\u1ec3 t\u00ednh s\u1ed1 l\u01b0\u1ee3ng t\u1ed1i \u0111a (kh\u00f4ng gian t\u00ecm ki\u1ebfm) kh\u1ea3 n\u0103ng m\u1ed9t ch\u01b0\u01a1ng tr\u00ecnh ph\u00e1 m\u1eadt kh\u1ea9u ph\u1ea3i th\u1eed tr\u01b0\u1edbc khi t\u00ecm ra ch\u00ednh x\u00e1c m\u1eadt kh\u1ea9u.<\/div>\n
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Sau \u0111\u00e2y l\u00e0 k\u1ebft qu\u1ea3:<\/p>\n