{"id":1484,"date":"2023-02-25T03:26:42","date_gmt":"2023-02-25T03:26:42","guid":{"rendered":"https:\/\/securitybriefing.net\/?p=1484"},"modified":"2023-02-25T03:26:42","modified_gmt":"2023-02-25T03:26:42","slug":"cam-bien-di-dong-wifi-dinh-vi-trong-nha","status":"publish","type":"post","link":"https:\/\/securitybriefing.net\/vi\/cong-nghe\/cam-bien-di-dong-wifi-dinh-vi-trong-nha\/","title":{"rendered":"C\u1ea3m bi\u1ebfn di \u0111\u1ed9ng: \u0110\u1ecbnh v\u1ecb trong nh\u00e0 b\u1eb1ng WiFi"},"content":{"rendered":"

Gi\u1edbi thi\u1ec7u<\/h2>\n\n\n

Trong nh\u1eefng n\u0103m g\u1ea7n \u0111\u00e2y, v\u1ea5n \u0111\u1ec1 v\u1ecb tr\u00ed \u0111\u00e3 tr\u1edf n\u00ean ng\u00e0y c\u00e0ng quan tr\u1ecdng. C\u00e1c d\u1ecbch v\u1ee5 nh\u01b0 Google Maps \u0111\u00e3 gi\u00fap vi\u1ec7c \u0111i\u1ec1u h\u01b0\u1edbng v\u00e0 x\u00e1c \u0111\u1ecbnh c\u00e1c \u0111i\u1ec3m c\u1ee5 th\u1ec3 \u1edf b\u1ea5t k\u1ef3 \u0111\u00e2u tr\u00ean th\u1ebf gi\u1edbi tr\u1edf n\u00ean d\u1ec5 d\u00e0ng b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng v\u1ec7 tinh. V\u00ec c\u00e1c h\u1ec7 th\u1ed1ng n\u00e0y \u0111\u00e3 ho\u1ea1t \u0111\u1ed9ng ch\u00ednh x\u00e1c ngo\u00e0i tr\u1eddi, b\u01b0\u1edbc ti\u1ebfp theo l\u00e0 \u00e1p d\u1ee5ng c\u00f4ng ngh\u1ec7 t\u01b0\u01a1ng t\u1ef1 trong c\u00e1c t\u00f2a nh\u00e0, nh\u01b0 b\u1ea3o t\u00e0ng ho\u1eb7c trung t\u00e2m th\u01b0\u01a1ng m\u1ea1i. C\u00e1c h\u1ec7 th\u1ed1ng t\u01b0\u01a1ng t\u1ef1 c\u00f3 th\u1ec3 h\u01b0\u1edbng d\u1eabn m\u1ecdi ng\u01b0\u1eddi \u0111\u1ebfn c\u00e1c \u0111\u1ecba \u0111i\u1ec3m quan t\u00e2m, ch\u1eb3ng h\u1ea1n nh\u01b0 m\u1ed9t t\u00e1c ph\u1ea9m ngh\u1ec7 thu\u1eadt trong b\u1ea3o t\u00e0ng, ho\u1eb7c cung c\u1ea5p n\u1ed9i dung d\u1ef1a tr\u00ean v\u1ecb tr\u00ed, ch\u1eb3ng h\u1ea1n nh\u01b0 qu\u1ea3ng c\u00e1o khi \u0111i ngang qua m\u1ed9t c\u1eeda h\u00e0ng trong trung t\u00e2m mua s\u1eafm. Tuy nhi\u00ean, trong m\u00f4i tr\u01b0\u1eddng k\u00edn, \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a v\u1ec7 tinh th\u1ea5p, khi\u1ebfn c\u1ea7n ph\u1ea3i s\u1eed d\u1ee5ng c\u00e1c c\u00f4ng ngh\u1ec7 kh\u00e1c \u0111\u1ec3 \u0111\u1ecbnh v\u1ecb hi\u1ec7u qu\u1ea3.<\/p>\n\n\n

C\u00f4ng ngh\u1ec7 \u0111\u1ecbnh v\u1ecb trong nh\u00e0<\/h2>\n\n\n

C\u00e1c d\u1ecbch v\u1ee5 d\u1ef1a tr\u00ean v\u1ecb tr\u00ed trong nh\u00e0 \u0111\u00e3 t\u1ea1o ra s\u1ef1 quan t\u00e2m l\u1edbn do \u00fd ngh\u0129a x\u00e3 h\u1ed9i v\u00e0 ti\u1ec1n t\u1ec7 c\u1ee7a ch\u00fang, v\u1edbi gi\u00e1 tr\u1ecb th\u1ecb tr\u01b0\u1eddng d\u1ef1 ki\u1ebfn \u0111\u1ea1t 10 t\u1ef7 \u0111\u00f4 la v\u00e0o n\u0103m 2020. Do s\u1ef1 k\u00e9m hi\u1ec7u qu\u1ea3 c\u1ee7a GPS trong m\u00f4i tr\u01b0\u1eddng trong nh\u00e0, c\u00e1c c\u00f4ng ngh\u1ec7 thay th\u1ebf nh\u01b0 WiFi ho\u1eb7c Bluetooth l\u00e0 c\u1ea7n thi\u1ebft. Beacon lu\u00f4n ph\u00e1t ra t\u00edn hi\u1ec7u c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c nh\u1eadn b\u1edfi c\u00e1c thi\u1ebft b\u1ecb t\u01b0\u01a1ng th\u00edch BLE kh\u00e1c. Ch\u00fang ph\u00f9 h\u1ee3p cho c\u00e1c h\u1ec7 th\u1ed1ng \u0111\u1ecbnh v\u1ecb v\u00ec ch\u00fang r\u1ebb, ti\u00eau th\u1ee5 \u00edt n\u0103ng l\u01b0\u1ee3ng v\u00e0 d\u1ec5 thi\u1ebft l\u1eadp. Tuy nhi\u00ean, c\u00e1c \u1ee9ng d\u1ee5ng hi\u1ec7n c\u00f3 c\u1ee7a c\u00e1c thu\u1eadt to\u00e1n theo d\u00f5i trong nh\u00e0 s\u1eed d\u1ee5ng c\u00f4ng ngh\u1ec7 kh\u00f4ng d\u00e2y th\u01b0\u1eddng kh\u00f4ng ch\u00ednh x\u00e1c. C\u00e1c thu\u1eadt to\u00e1n d\u1ef1a tr\u00ean \u0111o l\u01b0\u1eddng RSSI trong m\u1ea1ng WiFi th\u01b0\u1eddng kh\u00f4ng ch\u00ednh x\u00e1c do s\u1ef1 bi\u1ebfn \u0111\u1ed5i l\u1edbn c\u1ee7a t\u00edn hi\u1ec7u \u0111\u01b0\u1ee3c \u0111o t\u1ea1i m\u1ed7i th\u1eddi \u0111i\u1ec3m. M\u1eb7c d\u00f9 nhi\u1ec1u kh\u00eda c\u1ea1nh c\u1ee7a WiFi \u0111ang \u0111\u01b0\u1ee3c c\u1ea3i thi\u1ec7n, \u0111\u1ed9 ch\u00ednh x\u00e1c v\u1eabn c\u00f2n m\u1ed9t ch\u1eb7ng \u0111\u01b0\u1eddng d\u00e0i ph\u00eda tr\u01b0\u1edbc. <\/p>\n\n\n

Truy\u1ec1n th\u00f4ng kh\u00f4ng d\u00e2y<\/h2>\n\n\n
\"Truy\u1ec1n<\/figure>\n\n\n\n
<\/div>\n\n\n\n

Trong truy\u1ec1n th\u00f4ng kh\u00f4ng d\u00e2y, ph\u01b0\u01a1ng ti\u1ec7n \u0111\u1ec3 g\u1eedi th\u00f4ng tin lu\u00f4n \u0111\u01b0\u1ee3c chia s\u1ebb. \u0110\u00e2y l\u00e0 m\u1ed9t \u0111i\u1ec3m kh\u00e1c bi\u1ec7t l\u1edbn so v\u1edbi c\u00f4ng ngh\u1ec7 c\u00f3 d\u00e2y. \u0110\u1ec3 tr\u00e1nh ch\u1ed3ng ch\u00e9o d\u1ea3i t\u1ea7n v\u00e0 nhi\u1ec5u, ph\u1ea3i c\u00f3 c\u00e1c quy t\u1eafc nghi\u00eam ng\u1eb7t v\u1ec1 c\u00e1ch s\u1eed d\u1ee5ng kh\u00f4ng gian. C\u00e1c giao th\u1ee9c truy\u1ec1n th\u00f4ng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng b\u1edfi m\u1ed7i thi\u1ebft b\u1ecb tham gia c\u00f3 tr\u00e1ch nhi\u1ec7m ph\u1ed1i h\u1ee3p truy c\u1eadp v\u00e0o ph\u01b0\u01a1ng ti\u1ec7n. Hi\u1ec7u qu\u1ea3 c\u1ee7a m\u1ea1ng kh\u00f4ng d\u00e2y ph\u1ee5 thu\u1ed9c v\u00e0o nhi\u1ec1u y\u1ebfu t\u1ed1, bao g\u1ed3m s\u1ed1 l\u01b0\u1ee3ng m\u00e1y t\u00ednh chia s\u1ebb m\u1ea1ng, \u0111i\u1ec1u ki\u1ec7n m\u00f4i tr\u01b0\u1eddng, nhi\u1ec5u \u0111i\u1ec7n t\u1eeb, ch\u01b0\u1edbng ng\u1ea1i v\u1eadt v\u00e0 \u0111\u1ed9 tr\u1ec5. <\/p>\n\n\n\n

T\u1ed1c \u0111\u1ed9 truy\u1ec1n d\u1eef li\u1ec7u t\u1ed1i \u0111a kh\u00f4ng bao gi\u1edd \u0111\u1ea1i di\u1ec7n cho t\u1ed1c \u0111\u1ed9 truy\u1ec1n d\u1eef li\u1ec7u \"h\u1eefu \u00edch\" t\u1ed1i \u0111a v\u00ec m\u1ed9t ph\u1ea7n c\u1ee7a khung \u0111\u01b0\u1ee3c chi\u1ebfm b\u1edfi th\u00f4ng tin v\u1ec1 ki\u1ec3m so\u00e1t truy c\u1eadp ph\u01b0\u01a1ng ti\u1ec7n, ki\u1ec3m so\u00e1t lu\u1ed3ng, m\u00e3 h\u00f3a, v.v. T\u1ed1c \u0111\u1ed9 truy\u1ec1n d\u1eef li\u1ec7u th\u1ef1c t\u1ebf lu\u00f4n th\u1ea5p h\u01a1n so v\u1edbi m\u1ee9c \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh trong c\u00e1c ti\u00eau chu\u1ea9n. V\u00ec m\u1ea1ng kh\u00f4ng d\u00e2y \u0111\u01b0\u1ee3c ph\u00e1t s\u00f3ng qua kh\u00f4ng kh\u00ed, b\u1ea3o m\u1eadt tr\u1edf th\u00e0nh y\u1ebfu t\u1ed1 quan tr\u1ecdng, y\u00eau c\u1ea7u x\u00e1c th\u1ef1c v\u00e0 m\u00e3 h\u00f3a d\u1eef li\u1ec7u \u0111\u1ec3 ng\u0103n ch\u1eb7n truy c\u1eadp tr\u00e1i ph\u00e9p.<\/p>\n\n\n

\u0110\u1ecbnh v\u1ecb trong nh\u00e0 b\u1eb1ng WiFi<\/h2>\n\n\n

WiFi, vi\u1ebft t\u1eaft c\u1ee7a Wireless Fidelity, ra \u0111\u1eddi t\u1eeb nhu c\u1ea7u thi\u1ebft l\u1eadp m\u1ed9t c\u01a1 ch\u1ebf k\u1ebft n\u1ed1i kh\u00f4ng d\u00e2y t\u01b0\u01a1ng th\u00edch gi\u1eefa c\u00e1c thi\u1ebft b\u1ecb kh\u00e1c nhau. N\u00f3i c\u00e1ch kh\u00e1c, Wi-Fi l\u00e0 c\u00f4ng ngh\u1ec7 kh\u00f4ng d\u00e2y cho ph\u00e9p ng\u01b0\u1eddi d\u00f9ng k\u1ebft n\u1ed1i kh\u00f4ng d\u00e2y v\u1edbi nhau th\u00f4ng qua c\u00e1c thi\u1ebft b\u1ecb \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 Access Points (APs) ho\u1eb7c \u0111i\u1ec3m ph\u00e1t s\u00f3ng. N\u00f3 th\u01b0\u1eddng ho\u1ea1t \u0111\u1ed9ng tr\u00ean t\u1ea7n s\u1ed1 2,4 GHz v\u00e0 5 GHz v\u00e0 \u0111\u01b0\u1ee3c chu\u1ea9n h\u00f3a b\u1edfi Institute of Electrical and Electronics Engineers (IEEE). Trong nhi\u1ec1u n\u0103m qua, nhi\u1ec1u ti\u00eau chu\u1ea9n giao th\u1ee9c WiFi \u0111\u00e3 \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n, c\u1ea3i thi\u1ec7n nhi\u1ec1u kh\u00eda c\u1ea1nh so v\u1edbi c\u00e1c phi\u00ean b\u1ea3n tr\u01b0\u1edbc \u0111\u00f3.<\/p>\n\n\n

S\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a c\u00f4ng ngh\u1ec7 Wi-Fi<\/h2>\n\n\n

Ti\u00eau chu\u1ea9n ch\u00ednh th\u1ee9c \u0111\u1ea7u ti\u00ean l\u00e0 802.11b, ti\u1ebfp theo l\u00e0 802.11a, 802.11g, 802.11n v\u00e0 802.11ac. C\u00e1c phi\u00ean b\u1ea3n b v\u00e0 g ho\u1ea1t \u0111\u1ed9ng trong b\u0103ng t\u1ea7n 2.4 GHz v\u00e0 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i nh\u1ea5t. N\u0103m 2019, 802.11ax (g\u1ecdi l\u00e0 Wi-Fi 6) \u0111\u00e3 \u0111\u01b0\u1ee3c ra m\u1eaft, \u0111\u01b0\u1ee3c \u01b0\u1edbc t\u00ednh c\u00f3 hi\u1ec7u su\u1ea5t g\u1ea5p b\u1ed1n l\u1ea7n so v\u1edbi 802.11ac. Trong khi m\u1ea1ng 5GHz \u0111\u1ea1t t\u1ed1c \u0111\u1ed9 nhanh h\u01a1n 2.4 GHz, ch\u00fang k\u00e9m hi\u1ec7u qu\u1ea3 h\u01a1n trong vi\u1ec7c xuy\u00ean qua c\u00e1c ch\u01b0\u1edbng ng\u1ea1i v\u1eadt nh\u01b0 t\u01b0\u1eddng v\u00e0 \u0111\u1ed3 n\u1ed9i th\u1ea5t, d\u1eabn \u0111\u1ebfn ph\u1ea1m vi ph\u1ee7 s\u00f3ng th\u1ea5p h\u01a1n. M\u1ed9t m\u1ea1ng Wi-Fi trung b\u00ecnh c\u00f3 ph\u1ea1m vi 300 feet ngo\u00e0i tr\u1eddi ho\u1eb7c 150 feet trong nh\u00e0.<\/p>\n\n\n\n

L\u1ee3i \u00edch ch\u00ednh c\u1ee7a vi\u1ec7c s\u1eed d\u1ee5ng m\u1ea1ng Wi-Fi \u0111\u1ec3 \u0111\u1ecbnh v\u1ecb l\u00e0 c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng \u0111\u00e3 c\u00f3 s\u1eb5n trong c\u00e1c t\u00f2a nh\u00e0. Do s\u1ef1 ph\u00e1t tri\u1ec3n nhanh ch\u00f3ng c\u1ee7a m\u1ea1ng kh\u00f4ng d\u00e2y cho m\u1ee5c \u0111\u00edch gia \u0111\u00ecnh v\u00e0 kinh doanh, vi\u1ec7c t\u00ecm th\u1ea5y nhi\u1ec1u h\u01a1n m\u1ed9t \u0111i\u1ec3m truy c\u1eadp Wi-Fi trong m\u1ed9t t\u00f2a nh\u00e0 l\u00e0 \u0111i\u1ec1u ph\u1ed5 bi\u1ebfn. C\u00e1c \u0111i\u1ec3m truy c\u1eadp n\u00e0y c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c l\u1eafp \u0111\u1eb7t \u0111\u1ed9c l\u1eadp ho\u1eb7c \u0111\u1ebfn t\u1eeb c\u00e1c \u0111\u1ecba \u0111i\u1ec3m kh\u00e1c g\u1ea7n \u0111\u00f3. M\u1eb7t kh\u00e1c, v\u1ea5n \u0111\u1ec1 l\u1edbn nh\u1ea5t l\u00e0 giao th\u1ee9c 802.11 kh\u00f4ng \u0111\u01b0\u1ee3c t\u1ea1o ra \u0111\u1ec3 s\u1eed d\u1ee5ng theo c\u00e1ch n\u00e0y. M\u1ed7i khi b\u1ea1n mu\u1ed1n x\u00e1c \u0111\u1ecbnh v\u1ecb tr\u00ed c\u1ee7a m\u00ecnh, b\u1ea1n ph\u1ea3i g\u1eedi tin nh\u1eafn \u0111\u1ebfn t\u1ea5t c\u1ea3 c\u00e1c \u0111i\u1ec3m truy c\u1eadp Wi-Fi \u0111\u1ec3 y\u00eau c\u1ea7u th\u00f4ng tin ch\u00ednh x\u00e1c, \u0111i\u1ec1u n\u00e0y l\u00e0m ch\u1eadm m\u1ea1ng. \u0110\u1ebfn l\u01b0\u1ee3t n\u00f3, c\u00f3 th\u1ec3 x\u1ea3y ra tr\u01b0\u1eddng h\u1ee3p m\u1ed9t s\u1ed1 \u0111i\u1ec3m truy c\u1eadp thu\u1ed9c v\u1ec1 b\u00ean th\u1ee9 ba ch\u1eb7n c\u00e1c y\u00eau c\u1ea7u nh\u01b0 v\u1eady.<\/p>\n\n\n\n

C\u00e1c ti\u00eau chu\u1ea9n kh\u00f4ng d\u00e2y IEEE 802.11 s\u1eed d\u1ee5ng m\u1ed9t giao th\u1ee9c truy c\u1eadp m\u00f4i tr\u01b0\u1eddng g\u1ecdi l\u00e0 CSMA\/CA (Carrier Sense Multiple Access with Collision Avoidance). T\u00ean c\u1ee7a n\u00f3 t\u01b0\u01a1ng t\u1ef1 nh\u01b0 giao th\u1ee9c \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong m\u1ea1ng Ethernet c\u00f3 d\u00e2y (CSMA\/CD: Carrier Sense Multiple Access with Collision Detection), nh\u01b0ng c\u00e1ch ho\u1ea1t \u0111\u1ed9ng c\u1ee7a n\u00f3 kh\u00e1c nhau. Trong tr\u01b0\u1eddng h\u1ee3p kh\u00f4ng d\u00e2y, CA \u0111\u1ec1 c\u1eadp \u0111\u1ebfn vi\u1ec7c tr\u00e1nh va ch\u1ea1m, trong khi \u1edf Ethernet, n\u00f3 l\u00e0 v\u1ec1 ph\u00e1t hi\u1ec7n va ch\u1ea1m. M\u1ea1ng Wi-Fi l\u00e0 b\u00e1n song c\u00f4ng, c\u00f3 ngh\u0129a l\u00e0 c\u00e1c thi\u1ebft b\u1ecb kh\u00f4ng th\u1ec3 truy\u1ec1n v\u00e0 nh\u1eadn \u0111\u1ed3ng th\u1eddi tr\u00ean c\u00f9ng m\u1ed9t k\u00eanh v\u00f4 tuy\u1ebfn. M\u1ed9t thi\u1ebft b\u1ecb kh\u00f4ng th\u1ec3 \"nghe\" trong khi \u0111ang truy\u1ec1n, v\u00ec v\u1eady n\u00f3 kh\u00f4ng th\u1ec3 ph\u00e1t hi\u1ec7n va ch\u1ea1m. V\u00ec l\u00fd do n\u00e0y, c\u00e1c chuy\u00ean gia IEEE \u0111\u00e3 s\u1eed d\u1ee5ng m\u1ed9t c\u01a1 ch\u1ebf tr\u00e1nh va ch\u1ea1m m\u00e0 h\u1ecd g\u1ecdi l\u00e0 DCF (Distributed Control Function).<\/p>\n\n\n

B\u1ea3o m\u1eadt m\u1ea1ng WiFi<\/h2>\n\n\n

V\u00ec ph\u01b0\u01a1ng ti\u1ec7n truy\u1ec1n d\u1eabn l\u00e0 kh\u00f4ng kh\u00ed, v\u1ed1n d\u0129 c\u00f3 th\u1ec3 truy c\u1eadp \u0111\u01b0\u1ee3c b\u1edfi b\u1ea5t k\u1ef3 thi\u1ebft b\u1ecb n\u00e0o, n\u00ean vi\u1ec7c \u0111\u1ea3m b\u1ea3o r\u1eb1ng quy\u1ec1n truy c\u1eadp m\u1ea1ng b\u1ecb h\u1ea1n ch\u1ebf \u0111\u1ed1i v\u1edbi c\u00e1c thi\u1ebft b\u1ecb \u0111\u01b0\u1ee3c \u1ee7y quy\u1ec1n l\u00e0 r\u1ea5t quan tr\u1ecdng. \u0110\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c \u0111i\u1ec1u n\u00e0y, ti\u00eau chu\u1ea9n 802.11i \u0111\u1ecbnh ngh\u0129a c\u00e1c h\u1ec7 th\u1ed1ng kh\u00e1c nhau, ch\u1eb3ng h\u1ea1n nh\u01b0 WEP<\/strong>, WPA<\/strong> v\u00e0 WPA2<\/strong>, trong \u0111\u00f3 c\u00e1c thi\u1ebft b\u1ecb s\u1eed d\u1ee5ng kh\u00f3a \u0111\u1ec3 x\u00e1c th\u1ef1c. C\u00e1c Access Points \u0111\u1ecbnh k\u1ef3 ph\u00e1t qu\u1ea3ng c\u00e1o ch\u1ee9a SSID<\/strong> (Service Set Identifier), cho ph\u00e9p ng\u01b0\u1eddi d\u00f9ng x\u00e1c \u0111\u1ecbnh AP ch\u00ednh x\u00e1c v\u00e0 k\u1ebft n\u1ed1i v\u1edbi n\u00f3. Qu\u00e1 tr\u00ecnh k\u1ebft n\u1ed1i b\u1eaft \u0111\u1ea7u b\u1eb1ng th\u1ee7 t\u1ee5c x\u00e1c th\u1ef1c, trong \u0111\u00f3 m\u1ed9t kh\u00f3a \u0111\u01b0\u1ee3c t\u1ea1o ra. M\u1ea1ng WiFi c\u00f3 ba lo\u1ea1i x\u00e1c th\u1ef1c.<\/p>\n\n\n\n

    \n
  1. Kh\u00f3a B\u1ea3o M\u1eadt T\u01b0\u01a1ng \u0110\u01b0\u01a1ng C\u00f3 D\u00e2y (WEP)<\/strong>:<\/li>\n<\/ol>\n\n\n\n

    M\u1ee5c ti\u00eau c\u1ee7a h\u1ec7 th\u1ed1ng b\u1ea3o m\u1eadt n\u00e0y l\u00e0 l\u00e0m cho c\u00e1c m\u1ea1ng kh\u00f4ng d\u00e2y an to\u00e0n nh\u01b0 c\u00e1c m\u1ea1ng c\u00f3 d\u00e2y. Th\u1eadt kh\u00f4ng may, n\u00f3 \u0111\u00e3 nhanh ch\u00f3ng b\u1ecb x\u00e2m ph\u1ea1m v\u00e0 hi\u1ec7n t\u1ea1i kh\u00f4ng \u0111\u01b0\u1ee3c khuy\u1ebfn ngh\u1ecb s\u1eed d\u1ee5ng. Khi b\u1eaft \u0111\u1ea7u qu\u00e1 tr\u00ecnh x\u00e1c th\u1ef1c, thi\u1ebft b\u1ecb kh\u00e1ch g\u1eedi m\u1ed9t tin nh\u1eafn v\u0103n b\u1ea3n kh\u00f4ng m\u00e3 h\u00f3a, m\u00e0 AP m\u00e3 h\u00f3a b\u1eb1ng m\u1ed9t kh\u00f3a chia s\u1ebb v\u00e0 tr\u1ea3 l\u1ea1i cho kh\u00e1ch h\u00e0ng. C\u00e1c kh\u00f3a th\u01b0\u1eddng l\u00e0 128 ho\u1eb7c 256 bit. V\u1ea5n \u0111\u1ec1 ch\u00ednh v\u1edbi WEP l\u00e0 qu\u1ea3n l\u00fd kh\u00f3a. Th\u00f4ng th\u01b0\u1eddng, c\u00e1c kh\u00f3a \u0111\u01b0\u1ee3c ph\u00e2n ph\u1ed1i th\u1ee7 c\u00f4ng ho\u1eb7c th\u00f4ng qua m\u1ed9t tuy\u1ebfn \u0111\u01b0\u1eddng an to\u00e0n kh\u00e1c. WEP s\u1eed d\u1ee5ng c\u00e1c kh\u00f3a chia s\u1ebb, c\u00f3 ngh\u0129a l\u00e0 n\u00f3 s\u1eed d\u1ee5ng c\u00f9ng m\u1ed9t kh\u00f3a cho t\u1ea5t c\u1ea3 c\u00e1c kh\u00e1ch h\u00e0ng, v\u00ec v\u1eady n\u1ebfu kh\u00f3a b\u1ecb ph\u00e1t hi\u1ec7n, t\u1ea5t c\u1ea3 ng\u01b0\u1eddi d\u00f9ng \u0111\u1ec1u g\u1eb7p r\u1ee7i ro. \u0110\u1ec3 l\u1ea5y \u0111\u01b0\u1ee3c kh\u00f3a, ch\u1ec9 c\u1ea7n l\u1eafng nghe cho \u0111\u1ebfn khi nh\u1eadn \u0111\u01b0\u1ee3c ph\u1ea3n h\u1ed3i c\u1ee7a c\u00e1c khung x\u00e1c th\u1ef1c. S\u1eed d\u1ee5ng WEP t\u1ed1t h\u01a1n l\u00e0 kh\u00f4ng c\u00f3 g\u00ec; khi kh\u00f4ng c\u00f3 g\u00ec t\u1ed1t h\u01a1n, n\u00ean s\u1eed d\u1ee5ng n\u00f3. M\u1ed9t khuy\u1ebfn ngh\u1ecb t\u1ed1t l\u00e0 s\u1eed d\u1ee5ng b\u1ea3o m\u1eadt \u1edf c\u00e1c l\u1edbp tr\u00ean, ch\u1eb3ng h\u1ea1n nh\u01b0 m\u00e3 h\u00f3a SSL, TSL, v.v.<\/p>\n\n\n\n

      \n
    1. Truy C\u1eadp \u0110\u01b0\u1ee3c B\u1ea3o V\u1ec7 Wi-Fi (WPA)<\/strong><\/li>\n<\/ol>\n\n\n\n

      \u0110\u1ec3 kh\u1eafc ph\u1ee5c c\u00e1c l\u1ed7 h\u1ed5ng b\u1ea3o m\u1eadt c\u1ee7a WEP, WPA \u0111\u00e3 \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n. H\u1ec7 th\u1ed1ng n\u00e0y \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf d\u01b0\u1edbi s\u1ef1 b\u1ea3o tr\u1ee3 c\u1ee7a WiFi Alliance v\u00e0 s\u1eed d\u1ee5ng m\u1ed9t ph\u1ea7n c\u1ee7a ti\u00eau chu\u1ea9n 802.11i, sau n\u00e0y \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt \u0111\u1ec3 thay th\u1ebf WEP. M\u1ed9t trong nh\u1eefng y\u1ebfu t\u1ed1 ch\u00ednh c\u1ee7a WPA l\u00e0 TKIP<\/strong> (Temporal Key Integrity Protocol), m\u1ed9t ph\u1ea7n c\u1ee7a ti\u00eau chu\u1ea9n 802.11i v\u00e0 ho\u1ea1t \u0111\u1ed9ng b\u1eb1ng c\u00e1ch t\u1ea1o ra c\u00e1c kh\u00f3a \u0111\u1ed9ng. WPA c\u00f3 th\u1ec3 t\u00f9y ch\u1ecdn s\u1eed d\u1ee5ng AES-CCMP<\/strong> (Advanced Encryption Standard \u2013 Counter Mode with Cipher Block Chaining Message Authentication Code Protocol) \u0111\u1ec3 thay th\u1ebf TKIP.<\/p>\n\n\n\n

        \n
      1. WPA2\/WPAv2<\/strong>:<\/li>\n<\/ol>\n\n\n\n

        \u0110\u00e2y hi\u1ec7n l\u00e0 k\u1ef9 thu\u1eadt t\u1ed1t nh\u1ea5t c\u00f3 s\u1eb5n \u0111\u1ec3 b\u1ea3o m\u1eadt m\u1ea1ng WiFi. N\u00f3 s\u1eed d\u1ee5ng AES-CCMP b\u1eaft bu\u1ed9c v\u00e0 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong t\u1ea5t c\u1ea3 c\u00e1c thi\u1ebft b\u1ecb \u0111\u01b0\u1ee3c s\u1ea3n xu\u1ea5t ng\u00e0y nay.<\/p>\n\n\n

        Ti\u00eau chu\u1ea9n<\/h2>\n\n\n

        Hi\u1ec7n t\u1ea1i ch\u00fang t\u00f4i c\u00f3 quy\u1ec1n truy c\u1eadp v\u00e0o c\u00e1c m\u1ea1ng kh\u00f4ng d\u00e2y kh\u00e1c nhau cung c\u1ea5p k\u1ebft n\u1ed1i cho nhi\u1ec1u thi\u1ebft b\u1ecb ch\u00fang t\u00f4i s\u1eed d\u1ee5ng h\u00e0ng ng\u00e0y. C\u00e1c ti\u00eau chu\u1ea9n truy\u1ec1n th\u00f4ng kh\u00e1c nhau th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng d\u01b0\u1edbi t\u00ean \u201eWiFi\u201d, bao g\u1ed3m:<\/p>\n\n\n\n

        802.11a<\/strong>: m\u1ed9t m\u1ea1ng kh\u00f4ng d\u00e2y s\u1eed d\u1ee5ng b\u0103ng t\u1ea7n ISM 5 GHz v\u00e0 t\u1ed1c \u0111\u1ed9 truy\u1ec1n d\u1eef li\u1ec7u l\u00ean \u0111\u1ebfn 54 Mbps.<\/p>\n\n\n\n

        \u2022 802.11b<\/strong>: m\u1ed9t m\u1ea1ng kh\u00f4ng d\u00e2y v\u1edbi s\u00f3ng mang trong b\u0103ng t\u1ea7n ISM 2.4 GHz v\u00e0 t\u1ed1c \u0111\u1ed9 truy\u1ec1n d\u1eef li\u1ec7u l\u00ean \u0111\u1ebfn 11 Mbps. <\/p>\n\n\n\n

        \u2022 802.11g<\/strong>: m\u1ed9t m\u1ea1ng kh\u00f4ng d\u00e2y c\u00f3 s\u00f3ng mang trong b\u0103ng t\u1ea7n ISM 2,4 GHz v\u00e0 t\u1ed1c \u0111\u1ed9 truy\u1ec1n d\u1eef li\u1ec7u l\u00ean \u0111\u1ebfn 54 Mbps.<\/p>\n\n\n\n

        \u2022 802.11i<\/strong>: x\u00e1c th\u1ef1c v\u00e0 m\u00e3 h\u00f3a.<\/p>\n\n\n\n

        \u2022 802.11n<\/strong>: m\u1ed9t m\u1ea1ng kh\u00f4ng d\u00e2y c\u00f3 s\u00f3ng mang trong b\u0103ng t\u1ea7n ISM 2,4 GHz v\u00e0 5 GHz, v\u1edbi t\u1ed1c \u0111\u1ed9 truy\u1ec1n d\u1eef li\u1ec7u l\u00ean \u0111\u1ebfn 600 Mbps.<\/p>\n\n\n\n

        \u2022 802.11ac<\/strong>: m\u1ed9t m\u1ea1ng kh\u00f4ng d\u00e2y c\u00f3 t\u1ea7n s\u1ed1 d\u01b0\u1edbi 6 GHz, v\u1edbi t\u1ed1c \u0111\u1ed9 truy\u1ec1n d\u1eef li\u1ec7u \u00edt nh\u1ea5t 1 Gbps trong ho\u1ea1t \u0111\u1ed9ng \u0111a tr\u1ea1m v\u00e0 500 Mbps trong m\u1ed9t li\u00ean k\u1ebft \u0111\u01a1n.<\/p>\n\n\n

        K\u1ebft lu\u1eadn<\/h2>\n\n\n

        Gi\u1eef cho m\u1ea1ng WiFi c\u1ee7a b\u1ea1n an to\u00e0n c\u0169ng gi\u1ed1ng nh\u01b0 vi\u1ec7c kh\u00f3a c\u1eeda ch\u00ednh\u2014b\u1ea1n kh\u00f4ng mu\u1ed1n ai c\u0169ng c\u00f3 th\u1ec3 v\u00e0o \u0111\u01b0\u1ee3c, \u0111\u00fang kh\u00f4ng? M\u1eb7c d\u00f9 Wired-Equivalent Privacy (WEP) t\u1eebng l\u00e0 m\u1ed9t t\u00f9y ch\u1ecdn \u0111\u1ec3 b\u1ea3o v\u1ec7 m\u1ea1ng c\u1ee7a b\u1ea1n, gi\u1edd \u0111\u00e2y n\u00f3 \u0111\u00e3 l\u1ed7i th\u1eddi v\u00e0 c\u00f3 nh\u1eefng l\u1ed7 h\u1ed5ng \u0111\u00e3 bi\u1ebft. Wi-Fi Protected Access (WPA) v\u00e0 phi\u00ean b\u1ea3n k\u1ebf nhi\u1ec7m c\u1ee7a n\u00f3, WPA2\/WPAv2, l\u00e0 c\u00e1c bi\u1ec7n ph\u00e1p b\u1ea3o m\u1eadt hi\u1ec7u qu\u1ea3 h\u01a1n nhi\u1ec1u. C\u00e1c ti\u00eau chu\u1ea9n giao ti\u1ebfp WiFi kh\u00e1c nhau cung c\u1ea5p c\u00e1c t\u1ed1c \u0111\u1ed9 truy\u1ec1n d\u1eef li\u1ec7u v\u00e0 t\u1ea7n s\u1ed1 kh\u00e1c nhau, v\u00ec v\u1eady \u0111i\u1ec1u quan tr\u1ecdng l\u00e0 ch\u1ecdn ti\u00eau chu\u1ea9n ph\u00f9 h\u1ee3p v\u1edbi nhu c\u1ea7u c\u1ee7a b\u1ea1n. B\u1eb1ng c\u00e1ch th\u1ef1c hi\u1ec7n c\u00e1c bi\u1ec7n ph\u00e1p n\u00e0y, b\u1ea1n c\u00f3 th\u1ec3 gi\u1eef cho m\u1ea1ng WiFi c\u1ee7a m\u00ecnh an to\u00e0n m\u00e0 kh\u00f4ng l\u00e0m m\u1ea5t \u0111i s\u1ef1 ti\u1ec7n l\u1ee3i c\u1ee7a k\u1ebft n\u1ed1i kh\u00f4ng d\u00e2y.<\/p>","protected":false},"excerpt":{"rendered":"

        Gi\u1edbi thi\u1ec7u Trong nh\u1eefng n\u0103m g\u1ea7n \u0111\u00e2y, v\u1ea5n \u0111\u1ec1 v\u1ecb tr\u00ed ng\u00e0y c\u00e0ng tr\u1edf n\u00ean quan tr\u1ecdng. C\u00e1c d\u1ecbch v\u1ee5 nh\u01b0 Google Maps \u0111\u00e3 gi\u00fap b\u1ea1n d\u1ec5 d\u00e0ng \u0111i\u1ec1u h\u01b0\u1edbng v\u00e0 \u0111\u1ecbnh v\u1ecb c\u00e1c \u0111i\u1ec3m c\u1ee5 th\u1ec3 \u1edf b\u1ea5t k\u1ef3 \u0111\u00e2u tr\u00ean\u2026 Ti\u1ebfp t\u1ee5c \u0111\u1ecdc C\u1ea3m bi\u1ebfn di \u0111\u1ed9ng: \u0110\u1ecbnh v\u1ecb trong nh\u00e0 b\u1eb1ng WiFi<\/span><\/a><\/p>","protected":false},"author":1,"featured_media":1486,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[30],"tags":[],"class_list":["post-1484","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tech","entry"],"yoast_head":"\nMobile Sensing: WiFi Indoor Localization | Security Briefing<\/title>\n<meta name=\"description\" content=\"Keep your WiFi network secure with WEP, WPA, or WPA2. 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