WiFi quan cafe co an toan? Tan cong MITM, WiFi gia va cach bao ve ban than

Sang thu Bay, ban ngoi tai Highland Coffee, ket noi WiFi mien phi va mo ung dung ngan hang de chuyen tien. Moi thu dien ra binh thuong -- cho den khi nhan duoc thong bao "giao dich bat thuong" tu ngan hang. Tai khoan bi truy cap tu thiet bi la. So du giam dan. Ban khong hieu chuyen gi da xay ra.

Day khong phai kich ban phim. Day la chuyen that dang xay ra moi ngay tai cac quan cafe o Viet Nam, noi WiFi mien phi duoc coi nhu dieu hien nhien.

Cach hacker tan cong qua WiFi cong cong

Tan cong Man-in-the-Middle (MITM)

Hacker ngoi ngay trong quan cafe, su dung laptop de "chen vao giua" ket noi cua ban va router WiFi. Moi du lieu ban gui di -- mat khau, tin nhan, thong tin the -- deu di qua may cua hacker truoc khi den dich.

Evil Twin -- WiFi gia mao

Hacker tao mot mang WiFi co ten giong het WiFi cua quan: "Highland_Coffee_Free" hay "PhucLong_Guest". Dien thoai cua ban tu dong ket noi vi da tung dung ten tuong tu. Tu luc do, toan bo luu luong mang cua ban thuoc ve hacker.

Nghe len goi tin (Packet Sniffing)

Tren mang WiFi khong ma hoa, hacker su dung cong cu nhu Wireshark de thu thap moi goi du lieu truyen qua mang. Khong can ky thuat cao -- chi can mot phan mem mien phi va vai phut.

Nhung gi bi de doa khi dung WiFi cong cong?

• Ung dung ngan hang: Vietcombank, Techcombank, MoMo, ZaloPay -- thong tin dang nhap co the bi danh cap
• Tin nhan: Zalo, Messenger -- noi dung tro chuyen bi doc trom
• Mat khau: Tai khoan email, mang xa hoi, dich vu truc tuyen
• Vi tri: GPS va dia chi IP tiet lo ban dang o dau
• Cookie phien: Hacker co the "chiem" phien dang nhap cua ban ma khong can mat khau

Danh sach kiem tra bao mat WiFi cong cong

1. Su dung VPN -- Ma hoa toan bo ket noi. Cac VPN pho bien tai Viet Nam: NordVPN, Surfshark, ProtonVPN
2. Chi truy cap trang HTTPS -- Tim bieu tuong o khoa tren thanh dia chi trinh duyet
3. Tat tu dong ket noi WiFi -- Vao Cai dat > WiFi > Tat "Tu dong ket noi"
4. Quen mang sau khi dung -- Xoa mang WiFi cua quan cafe khoi danh sach da luu
5. Tat chia se tep va AirDrop -- Giam dien tan cong
6. Bat xac thuc 2 yeu to (2FA) -- Them lop bao ve cho tai khoan quan trong
7. Cap nhat phan mem thuong xuyen -- Va cac lo hong bao mat da biet

Hoat dong an toan va nguy hiem tren WiFi cong cong

Hoat dong	Muc do an toan	Ghi chu
Doc bao, luot web thong thuong	An toan	Khong co thong tin nhay cam
Xem YouTube, nghe nhac	An toan	Chi la streaming
Dang nhap email ca nhan	Nguy hiem	Mat khau co the bi danh cap
Giao dich ngan hang	Rat nguy hiem	Nguy co mat tien truc tiep
Mua sam truc tuyen	Nguy hiem	Thong tin the tin dung bi lo
Gui mat khau qua tin nhan	Rat nguy hiem	Du lieu truyen khong ma hoa
Dang nhap mang xa hoi	Nguy hiem	Tai khoan co the bi chiem
Su dung VPN + HTTPS	An toan	Du lieu duoc ma hoa

Bao ve lien ket nhay cam truoc khi chia se tren mang cong cong

Mot sai lam pho bien: ban ngoi trong quan cafe, gui link tai khoan ngan hang, mat khau WiFi nha, hoac thong tin ca nhan qua Zalo tren WiFi cong cong. Neu bi nghe len, hacker co toan bo thong tin.

Giai phap: truoc khi chia se bat ky thong tin nhay cam nao, hay bao ve chung bang mat khau. LOCK.PUB cho phep ban tao lien ket duoc bao ve bang mat khau -- nguoi nhan chi co the xem noi dung khi nhap dung mat khau. Du hacker co chan duoc lien ket, ho cung khong the doc duoc noi dung ben trong.

Dieu nay dac biet huu ich khi ban can chia se:

• Thong tin dang nhap tai khoan
• Lien ket tai lieu quan trong
• Mat khau WiFi cho khach
• Thong tin ca nhan nhay cam

Ket luan

WiFi mien phi tai quan cafe la tien loi, nhung cung la moi nguy tiem tang. Hacker khong can la thien tai cong nghe -- chi can mot laptop va vai cong cu co ban la du de danh cap thong tin cua ban.

Hay su dung VPN, chi truy cap HTTPS, va khong bao gio gui thong tin nhay cam tren mang cong cong ma khong ma hoa. Voi LOCK.PUB, ban co the bao ve moi lien ket va thong tin quan trong chi voi vai cu nhap chuot -- de WiFi mien phi chi la tien loi, khong phai la rui ro.

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Bao ve thong tin cua ban ngay hom nay tai lock.pub