Reverse website ：aHR0cHM6Ly93d3cucWltaW5ncGlhbi5jbi9maW5vc2RhL3Byb2plY3QvcGludmVzdG1lbnQ=

The data to be captured is as follows ：

1. Observation request

        Open console , Enter the URL and press enter . stay DOC Returned under module html Source code , We didn't find the data we needed , The probability of the returned data is through ajax Back to .

        stay XHR The following two interfaces are found under the module ：

        And the data returned by these two interfaces are encrypted data , as follows ：

        From this analysis ,`encrypt_data` It contains the data we need , It's just encrypted , We can't see normal plaintext data . The next thing we need to do is put these ciphertext data , By analyzing its encryption logic , Restore its plaintext data .

2. location `encrypt_data`

        By searching for keywords `encrypt_data`, only one js file ：
        Click in to change js file , And click... In the lower left corner of the page `{}` Symbol , format js Code ：

        And after formatting js In file , Search for `encrypt_data`  keyword , There are six places containing this keyword :

        And by observing these six codes , I found only one suspicious place , And make a breakpoint here

        Refresh the page , Breakpoints found effective , It shows that our analysis is correct , This breakpoint is where we need to analyze ： 

3. Locate the encryption entry

        stay `Object(d.a)` At the next breakpoint , And click the single step debugging button ：

        It will eventually arrive at `s(e)` This function , And the parameters of this function e, Is the encrypted data `encrypt_data`.

         We output... On the console `s(e)`, The output result is clear text , No longer ciphertext , explain `s(e)` This function is the entry of decryption .

4. analysis s(e) The logic of a function , And construction js Code

        This function calls the function o , Dyadic function o Pass six parameters in , among except `a.a.decode(e)` It needs further Beyond the analysis , The other five are fixed values . Finally through JSON.parse Put function o The return value of is converted to json object . After the analysis here , We can construct a general js It's logical , as follows ：

function s(e) {
    return JSON.parse(o("5e5062e82f15fe4ca9d24bc5", decode(e), 0, 0, "012345677890123", 1))
}

// encrypt_data  That is, the interface returns the ciphertext data 
var encrypt_data = " The string is too long , Copy by yourself encrypt_data Paste here "

decrypt_data = s(encrypt_data)

        In this code , function o It's not defined yet , function o Definition and function of s(e) In the peer Directory , Turn up and you will see , Put function o Copy it all , Put it into our own structure js Go to the code ：

        function o When it's done , It's just `a.a.decode(e)` Parameters , Make breakpoints in the following places ：

          And click the single step debugging button , You will see the following function ：

         Copy all the functions , Put our structure into js In the code .

5. completion js Running environment

        Pass step 4 , We have constructed js file , adopt node The environment runs this js file , You will find the following errors ：

ReferenceError: f is not defined
    at Module._compile (internal/modules/cjs/loader.js:1085:14)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1114:10)
    at Module.load (internal/modules/cjs/loader.js:950:32)
    at Function.Module._load (internal/modules/cjs/loader.js:790:14)
    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:76:12)
    at internal/main/run_main_module.js:17:47

        Tips f Undefined , Through error reporting , We are positioned to f stay decode Called in function ：

        And we can find the definition f The place of , as follows ：

        f Is a constant value , completion f after , Run again js Code , The following errors are found ：

ReferenceError: c is not defined
    at Module._compile (internal/modules/cjs/loader.js:1085:14)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1114:10)
    at Module.load (internal/modules/cjs/loader.js:950:32)
    at Function.Module._load (internal/modules/cjs/loader.js:790:14)
    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:76:12)
    at internal/main/run_main_module.js:17:47

          Tips c  Undefined , And defining f On top of , You can find c Statement of . completion c after , Run again js Code , Normal results ： 

6. summary

        The website is still relatively simple , It is more suitable for novices to practice their hands , For preliminary understanding of the reverse process .

ps: Last , The source code of this project has been submitted to  GitHub  in , Self access if required .