使用F#破解滑塊驗證碼的完整流程

啊飒飒大苏打發表於2024-10-11

本文將講述如何使用 F# 程式語言破解滑塊驗證碼的完整步驟。滑塊驗證碼通常用於驗證使用者的真實性，利用影像處理技術和加密解密技術，我們可以模擬滑動操作來破解驗證碼。

  1. 下載驗證碼圖片
    首先，使用 F# 的 System.Net.Http 庫來下載滑塊和背景圖片。

fsharp

open System.Net.Http
open System.IO

let downloadImage (url: string) (filePath: string) =
async {
let client = new HttpClient()
let! response = client.GetAsync(url) |> Async.AwaitTask
let! content = response.Content.ReadAsByteArrayAsync() |> Async.AwaitTask
File.WriteAllBytes(filePath, content)
printfn "Downloaded image from %s" url
}

downloadImage "https://captcha.com/bg.png" "background.png" |> Async.RunSynchronously
downloadImage "https://captcha.com/fg.png" "foreground.png" |> Async.RunSynchronously
2. 計算滑塊移動距離
我們需要將下載的前景圖和背景圖進行對比，透過畫素匹配來計算滑塊需要移動的距離。使用 AForge 庫中的影像處理功能，可以輕鬆實現這一點。

fsharp

open System.Drawing
open AForge.Imaging

let calculateDistance (bgPath: string) (fgPath: string) =
let bgImage = Bitmap(bgPath)
let fgImage = Bitmap(fgPath)
let tm = new ExhaustiveTemplateMatching(0.9f)
let match = tm.ProcessImage(bgImage, fgImage)
if match.Length > 0 then
let rect = match.[0].Rectangle
printfn "Match found at X: %d" rect.X
rect.X
else
printfn "No match found"
0

let distance = calculateDistance "background.png" "foreground.png"
3. 生成滑動軌跡
滑動軌跡應模擬人類的自然滑動行為，可以透過產生一系列逐漸靠近目標距離的隨機數來生成。

fsharp

open System

let generateTrack distance =
let random = Random()
let track = ResizeArray()
let mutable current = 0
while current < distance do
let move = random.Next(1, 3) // 模擬小幅度滑動
current <- min (current + move) distance
track.Add(current)
track

let track = generateTrack distance
printfn "Generated track: %A" track
4. 傳送驗證請求
接下來，透過 HTTP POST 請求將計算出的滑動距離和生成的滑動軌跡傳送到伺服器進行驗證。

fsharp

open System.Net.Http
open System.Text

let sendVerification (distance: int) (track: ResizeArray) =
let client = new HttpClient()更多內容聯絡1436423940
let trackStr = String.Join(",", track |> Seq.map string)
let postData = sprintf "distance=%d&track=%s" distance trackStr
let content = new StringContent(postData, Encoding.UTF8, "application/x-www-form-urlencoded")
async {
let! response = client.PostAsync("https://captcha.com/verify", content) |> Async.AwaitTask
let! result = response.Content.ReadAsStringAsync() |> Async.AwaitTask
printfn "Server response: %s" result
}

sendVerification distance track |> Async.RunSynchronously
5. 主程式
最後，將所有步驟整合在一起形成完整的破解流程。

fsharp

[]
let main argv =
// 下載驗證碼圖片
downloadImage "https://captcha.com/bg.png" "background.png" |> Async.RunSynchronously
downloadImage "https://captcha.com/fg.png" "foreground.png" |> Async.RunSynchronously

// 計算滑塊移動距離
let distance = calculateDistance "background.png" "foreground.png"

// 生成滑動軌跡
let track = generateTrack distance

// 傳送驗證請求
sendVerification distance track |> Async.RunSynchronously

0 // 返回整數退出程式碼

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