{"id":15020,"date":"2026-01-23T03:16:27","date_gmt":"2026-01-23T00:16:27","guid":{"rendered":"https:\/\/smspva.com\/blog\/entropy-mat-khau-duoc-giai-thich-bang-cac-thuat-ngu-don-gian-vi\/"},"modified":"2026-01-23T03:16:27","modified_gmt":"2026-01-23T00:16:27","slug":"entropy-mat-khau-duoc-giai-thich-bang-cac-thuat-ngu-don-gian-vi","status":"publish","type":"post","link":"https:\/\/smspva.com\/blog\/vi\/entropy-mat-khau-duoc-giai-thich-bang-cac-thuat-ngu-don-gian-vi\/","title":{"rendered":"Entropy cua mat khau duoc giai thich bang cac thuat ngu don gian"},"content":{"rendered":"\n<style>* { box-sizing: border-box; } body { font-family: Arial, sans-serif; color: #333; background: #fff; line-height: 1.6; } .container { max-width: 1000px; margin: 0 auto; padding: 20px; } .kicker { font-size: 0.9em; color: #555; margin-bottom: 8px; } .badge { display: inline-block; padding: 4px 8px; border-radius: 12px; background: #f0f4f8; color: #333; margin-right: 6px; font-weight: 600; } h1 { font-size: 2rem; margin: 0.5em 0; } .section { margin-top: 40px; } table { width: 100%; border-collapse: collapse; margin: 10px 0; } table th, table td { border: 1px solid #ddd; padding: 8px; text-align: left; } ul { padding-left: 20px; } a { color: #1a0dab; text-decoration: underline; } @media (max-width: 768px) { .container { padding: 12px; } }<\/style><article class='container' itemscope itemtype='https:\/\/schema.org\/TechArticle'><header><img src='\/storage\/articles\/password-entropy-explained-terms.png' alt='\u0110\u1ed3 h\u1ecda th\u1ec3 hi\u1ec7n m\u1ee9c entropy m\u1eadt kh\u1ea9u m\u1ea1nh so v\u1edbi m\u1eadt kh\u1ea9u y\u1ebfu'><div class='kicker'> <span class='badge'>M\u1ef9<\/span> <span class='badge'>Tr\u00ecnh t\u1ea1o m\u1eadt kh\u1ea9u<\/span> <span class='badge'>Entropy<\/span> <\/div><h1>Entropy c\u1ee7a m\u1eadt kh\u1ea9u \u0111\u01b0\u1ee3c gi\u1ea3i th\u00edch b\u1eb1ng c\u00e1c thu\u1eadt ng\u1eef \u0111\u01a1n gi\u1ea3n<\/h1><\/header><p>Entropy c\u1ee7a m\u1eadt kh\u1ea9u \u0111\u01b0\u1ee3c gi\u1ea3i th\u00edch b\u1eb1ng c\u00e1c thu\u1eadt ng\u1eef d\u1ec5 hi\u1ec3u gi\u00fap b\u1ea1n hi\u1ec3u t\u1ea1i sao m\u1eadt kh\u1ea9u d\u00e0i v\u00e0 ng\u1eabu nhi\u00ean kh\u00f3 b\u1ecb ph\u00e1. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 h\u01b0\u1edbng d\u1eabn b\u1eb1ng ng\u00f4n ng\u1eef ph\u1ed5 th\u00f4ng v\u1ec1 c\u00e1ch entropy ho\u1ea1t \u0111\u1ed9ng v\u00e0 c\u00e1ch c\u1ea3i thi\u1ec7n an to\u00e0n tr\u1ef1c tuy\u1ebfn.<\/p><section id='tldr' class='section'><h2>T\u00f3m t\u1eaft nhanh<\/h2><ul><li>Entropy \u0111o l\u01b0\u1eddng m\u1ee9c \u0111\u1ed9 kh\u00f3 \u0111o\u00e1n c\u1ee7a m\u1eadt kh\u1ea9u.<\/li><li>K\u00fd t\u1ef1 d\u00e0i h\u01a1n v\u00e0 ng\u1eabu nhi\u00ean h\u01a1n l\u00e0m t\u0103ng entropy.<\/li><li>S\u1eed d\u1ee5ng passphrase v\u00e0 tr\u00ecnh qu\u1ea3n l\u00fd m\u1eadt kh\u1ea9u \u0111\u1ec3 t\u0103ng entropy v\u00e0 b\u1ea3o m\u1eadt.<\/li><\/ul><\/section><section id='why-use' class='section'><h2>T\u1ea1i sao n\u00ean hi\u1ec3u entropy c\u1ee7a m\u1eadt kh\u1ea9u<\/h2><p>Hi\u1ec3u entropy gi\u00fap b\u1ea1n t\u1ea1o m\u1eadt kh\u1ea9u kh\u00f3 b\u1ecb k\u1ebb t\u1ea5n c\u00f4ng \u0111o\u00e1n. N\u00f3 c\u0169ng l\u00e0m r\u00f5 t\u1ea1i sao c\u00e1c nguy\u00ean t\u1eafc ch\u1ec9 d\u1ef1a tr\u00ean s\u1ed1 ho\u1eb7c k\u00fd hi\u1ec7u \u0111\u01a1n gi\u1ea3n s\u1ebd kh\u00f4ng \u0111\u1ee7 n\u1ebfu m\u1eadt kh\u1ea9u ng\u1eafn ho\u1eb7c d\u1ec5 \u0111o\u00e1n.<\/p><p>\u0110\u1ec3 bi\u1ebft th\u00eam chi ti\u1ebft v\u1ec1 c\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t, xem c\u00e1c t\u00e0i nguy\u00ean ngo\u00e0i: <a href='https:\/\/safety.google\/' target='_blank' rel=\"noopener\">An to\u00e0n Google<\/a>, <a href='https:\/\/en.wikipedia.org\/wiki\/Password_strength' target='_blank' rel=\"noopener\">Wikipedia: \u0110\u1ed9 m\u1ea1nh c\u1ee7a m\u1eadt kh\u1ea9u<\/a>, v\u00e0 <a href='https:\/\/cheatsheetseries.owasp.org\/cheatsheets\/Password_Storage_Cheat_Sheet.html' target='_blank' rel=\"noopener\">OWASP B\u1ea3ng Cheat Sheet L\u01b0u tr\u1eef m\u1eadt kh\u1ea9u<\/a>.<\/p><\/section><section id='howto' class='section'><h2>C\u00e1ch c\u1ea3i thi\u1ec7n entropy c\u1ee7a m\u1eadt kh\u1ea9u (theo t\u1eebng b\u01b0\u1edbc)<\/h2><ol><li>Ch\u1ecdn \u0111\u1ed9 d\u00e0i m\u1eadt kh\u1ea9u l\u00e2u h\u01a1n (12+ k\u00fd t\u1ef1) \u0111\u1ec3 t\u0103ng entropy.<\/li><li>S\u1eed d\u1ee5ng t\u1eadp k\u00fd t\u1ef1 \u0111a d\u1ea1ng (ch\u1eef th\u01b0\u1eddng, ch\u1eef hoa, s\u1ed1, k\u00fd hi\u1ec7u).<\/li><li>Xem x\u00e9t m\u1ed9t passphrase \u0111\u01b0\u1ee3c l\u00e0m t\u1eeb nh\u1eefng t\u1eeb kh\u00f4ng li\u00ean quan v\u1edbi ch\u1eef HOA v\u00e0 kho\u1ea3ng c\u00e1ch ng\u1eabu nhi\u00ean.<\/li><li>S\u1eed d\u1ee5ng tr\u00ecnh qu\u1ea3n l\u00fd m\u1eadt kh\u1ea9u uy t\u00edn \u0111\u1ec3 t\u1ea1o v\u00e0 l\u01b0u tr\u1eef m\u1eadt kh\u1ea9u ph\u1ee9c t\u1ea1p m\u1ed9t c\u00e1ch an to\u00e0n.<\/li><li>K\u00edch ho\u1ea1t x\u00e1c th\u1ef1c hai y\u1ebfu t\u1ed1 (2FA) khi c\u00f3.<\/li><li>Tr\u00e1nh c\u00e1c m\u1eabu ph\u1ed5 bi\u1ebfn, t\u1eeb \u0111i\u1ec3n v\u00e0 c\u00e1c thay th\u1ebf d\u1ec5 nh\u1eadn di\u1ec7n.<\/li><\/ol><\/section><section id='table' class='section'><h2>Entropy \u1edf m\u1ee9c nh\u00ecn nhanh: b\u1ea3ng nhanh<\/h2><table aria-label='Entropy table'><thead><tr><th>M\u1ee9c \u0111\u1ed9 entropy<\/th><th>\u0110\u1ed9 d\u00e0i v\u00ed d\u1ee5<\/th><th>Kho\u1ea3ng bit \u01b0\u1edbc l\u01b0\u1ee3ng<\/th><th>Ghi ch\u00fa<\/th><\/tr><\/thead><tbody><tr><td>Th\u1ea5p<\/td><td>8 k\u00fd t\u1ef1<\/td><td>~26-34<\/td><td>Char set gi\u1edbi h\u1ea1n ho\u1eb7c m\u1eabu d\u1ec5 \u0111o\u00e1n<\/td><\/tr><tr><td>Trung b\u00ecnh<\/td><td>12 k\u00fd t\u1ef1<\/td><td>~78<\/td><td>Ng\u1eabu nhi\u00ean nh\u01b0ng \u0111\u1ed9 d\u00e0i v\u1eeba ph\u1ea3i<\/td><\/tr><tr><td>Cao<\/td><td>16 k\u00fd t\u1ef1<\/td><td>~106+<\/td><td>M\u1ea1nh khi \u0111\u1ed9 ng\u1eabu nhi\u00ean cao<\/td><\/tr><\/tbody><\/table><\/section><section id='safe' class='section'><h2>S\u1eed d\u1ee5ng an to\u00e0n v\u00e0 h\u1ee3p ph\u00e1p<\/h2><p>S\u1eed d\u1ee5ng ki\u1ebfn th\u1ee9c entropy \u0111\u1ec3 b\u1ea3o v\u1ec7 t\u00e0i kho\u1ea3n c\u1ee7a b\u1ea1n. Kh\u00f4ng c\u1ed1 g\u1eafng ph\u00e1 m\u1eadt kh\u1ea9u b\u1ea1n kh\u00f4ng s\u1edf h\u1eefu. Lu\u00f4n t\u00f4n tr\u1ecdng quy\u1ec1n ri\u00eang t\u01b0 v\u00e0 c\u00e1c y\u00eau c\u1ea7u ph\u00e1p l\u00fd.<\/p><\/section><section id='faq' class='section'><h2>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2><div class='faq-item'><h3>Entropy c\u1ee7a m\u1eadt kh\u1ea9u l\u00e0 g\u00ec?<\/h3><p>Entropy c\u1ee7a m\u1eadt kh\u1ea9u l\u00e0 m\u1ed9t th\u01b0\u1edbc \u0111o \u0111\u1ed9 kh\u00f3 \u0111o\u00e1n d\u1ef1a tr\u00ean s\u1ed1 l\u01b0\u1ee3ng t\u1ed5 h\u1ee3p c\u00f3 th\u1ec3. Entropy c\u00e0ng cao c\u00f3 ngh\u0129a m\u1eadt kh\u1ea9u kh\u00f3 \u0111o\u00e1n h\u01a1n.<\/p><\/div><div class='faq-item'><h3>Bao nhi\u00eau bit entropy \u0111\u01b0\u1ee3c xem l\u00e0 \u0111\u1ee7 an to\u00e0n?<\/h3><p>Th\u00f4ng th\u01b0\u1eddng tham chi\u1ebfu l\u00e0 80+ bit cho b\u1ea3o m\u1eadt trung b\u00ecnh v\u00e0 128+ bit cho b\u1ea3o m\u1eadt cao, m\u1eb7c d\u00f9 nhu c\u1ea7u th\u1ef1c t\u1ebf thay \u0111\u1ed5i t\u00f9y tr\u01b0\u1eddng h\u1ee3p.<\/p><\/div><div class='faq-item'><h3>L\u00e0m sao t\u00f4i t\u00ednh entropy cho m\u1ed9t m\u1eadt kh\u1ea9u cho tr\u01b0\u1edbc?<\/h3><p>Entropy \u2248 log2(N^L) v\u1edbi N l\u00e0 k\u00edch th\u01b0\u1edbc t\u1eadp k\u00fd t\u1ef1 v\u00e0 L l\u00e0 chi\u1ec1u d\u00e0i m\u1eadt kh\u1ea9u. C\u00e1c t\u1eadp k\u00fd t\u1ef1 ph\u1ee9c t\u1ea1p h\u01a1n v\u00e0 chi\u1ec1u d\u00e0i l\u1edbn h\u01a1n t\u1ea1o ra entropy cao h\u01a1n.<\/p><\/div><div class='faq-item'><h3>Passphrase c\u00f3 an to\u00e0n h\u01a1n so v\u1edbi chu\u1ed7i ng\u1eabu nhi\u00ean ng\u1eafn?<\/h3><p>Passphrases c\u00f3 th\u1ec3 an to\u00e0n n\u1ebfu ch\u00fang d\u00e0i v\u00e0 \u0111\u01b0\u1ee3c t\u1ea1o t\u1eeb ngu\u1ed3n entropy cao, nh\u01b0ng c\u00e1c k\u00fd t\u1ef1 ng\u1eabu nhi\u00ean tr\u00ean m\u1ed9t b\u1ed9 k\u00fd t\u1ef1 l\u1edbn th\u01b0\u1eddng kh\u00f3 \u0111o\u00e1n h\u01a1n t\u1eebng k\u00fd t\u1ef1.<\/p><\/div><div class='faq-item'><h3>Entropy c\u00f3 li\u00ean quan \u0111\u1ebfn \u0111\u1ed9 d\u00e0i m\u1eadt kh\u1ea9u kh\u00f4ng?<\/h3><p>\u0110\u00fang. M\u1eadt kh\u1ea9u d\u00e0i h\u01a1n th\u01b0\u1eddng c\u00f3 entropy cao h\u01a1n, mi\u1ec5n l\u00e0 ch\u00fang kh\u00f4ng d\u1ec5 \u0111o\u00e1n ho\u1eb7c l\u1eb7p l\u1ea1i.<\/p><\/div><div class='faq-item'><h3>Entropy t\u01b0\u01a1ng t\u00e1c th\u1ebf n\u00e0o v\u1edbi x\u00e1c th\u1ef1c hai y\u1ebfu t\u1ed1?<\/h3><p>X\u00e1c th\u1ef1c hai y\u1ebfu t\u1ed1 b\u1ed5 sung m\u1ed9t l\u1edbp b\u1ea3o m\u1eadt, khi\u1ebfn ngay c\u1ea3 m\u1eadt kh\u1ea9u entropy th\u1ea5p c\u0169ng kh\u00f3 b\u1ecb x\u00e2m ph\u1ea1m.<\/p><\/div><\/section><section id='cta' class='section'><h2>H\u00e3y h\u00e0nh \u0111\u1ed9ng ngay b\u00e2y gi\u1edd<\/h2><p>T\u0103ng c\u01b0\u1eddng b\u1ea3o m\u1eadt c\u1ee7a b\u1ea1n v\u1edbi m\u1ed9t chi\u1ebfn l\u01b0\u1ee3c m\u1eadt kh\u1ea9u m\u1ea1nh. S\u1eed d\u1ee5ng tr\u00ecnh sinh m\u1eadt kh\u1ea9u v\u00e0 t\u00ecm hi\u1ec3u th\u00eam v\u1ec1 c\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t.<\/p><p><a href='https:\/\/smspva.com\/generate-password.html' target='_blank' rel=\"noopener\">H\u00e3y th\u1eed Tr\u00ecnh sinh m\u1eadt kh\u1ea9u<\/a> \u2014 v\u00e0 xem <a href='https:\/\/safety.google\/' target='_blank' rel=\"noopener\">An to\u00e0n Google<\/a> \u0111\u1ec3 c\u00f3 m\u1eb9o b\u1ea3o v\u1ec7 t\u00e0i kho\u1ea3n, ho\u1eb7c tham kh\u1ea3o <a href='https:\/\/en.wikipedia.org\/wiki\/Password_strength' target='_blank' rel=\"noopener\">Wikipedia: \u0110\u1ed9 m\u1ea1nh c\u1ee7a m\u1eadt kh\u1ea9u<\/a>.<\/p><\/section><section id='outro' class='section'><p>C\u1ea7n th\u00eam th\u00f4ng tin? Kh\u00e1m ph\u00e1 blog c\u1ee7a ch\u00fang t\u00f4i v\u1ec1 c\u00e1c ch\u1ee7 \u0111\u1ec1 li\u00ean quan \u0111\u1ebfn x\u00e1c th\u1ef1c an to\u00e0n v\u00e0 x\u00e1c th\u1ef1c ng\u01b0\u1eddi d\u00f9ng.<\/p><\/section><\/article>\n","protected":false},"excerpt":{"rendered":"<p>M\u1ef9 Tr\u00ecnh t\u1ea1o m\u1eadt kh\u1ea9u Entropy Entropy c\u1ee7a m\u1eadt kh\u1ea9u \u0111\u01b0\u1ee3c gi\u1ea3i th\u00edch b\u1eb1ng c\u00e1c thu\u1eadt ng\u1eef \u0111\u01a1n gi\u1ea3n Entropy c\u1ee7a m\u1eadt kh\u1ea9u \u0111\u01b0\u1ee3c gi\u1ea3i th\u00edch b\u1eb1ng c\u00e1c thu\u1eadt ng\u1eef d\u1ec5 hi\u1ec3u gi\u00fap b\u1ea1n hi\u1ec3u t\u1ea1i sao m\u1eadt kh\u1ea9u d\u00e0i v\u00e0 ng\u1eabu nhi\u00ean kh\u00f3 b\u1ecb ph\u00e1. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 h\u01b0\u1edbng d\u1eabn b\u1eb1ng ng\u00f4n ng\u1eef ph\u1ed5&#8230;<\/p>\n","protected":false},"author":5,"featured_media":15010,"comment_status":"","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[229],"tags":[],"lang":"vi","translations":{"vi":15020,"en":15009,"es":15012,"zh":15013,"ar":15014,"fr":15015,"de":15016,"tr":15017,"it":15018,"pl":15019,"ja":15021,"pt":15022},"featured":{"id":15010,"url":"https:\/\/smspva.com\/blog\/wp-content\/uploads\/2026\/01\/password-entropy-explained-terms.png","alt":"Graphic showing password entropy levels for strong vs weak passwords"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Entropy cua mat khau duoc giai thich bang cac thuat ngu don gian<\/title>\n<meta name=\"description\" content=\"Entropy cua mat khau duoc giai thich bang cac thuat ngu de hieu. 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