Network security - Novice introduction

MISC

      1、 Simple steganography

       2、 Looking for your sister

CRYPTO

      1、 Four Caesars or four fences

       2、 Beautiful notes

       3、 Little rabbit

 WEB

       1、 Sign in

       2、EZphp

1、 Simple steganography

Open the topic prompt , Follow the instructions , Search for CTF Steganography routine   Search for

Check the picture information according to our search results and find that there is no relevant flag Information about . Open according to the second method   010Editor.exe Software   Ctrl+F Search for

  The result appears .

SLsec{e2e0061f251355de79777499528d6d75}

2、 Looking for your sister

  Download the file on the topic , Because the file is zip Format , So rename the file and open the compressed package

  After opening the compressed package, there are two files

  After the first one opens

  good heavens , This is the declassification of the type of socialist core values .

  After decryption, he told me this flag It's not true , So I opened the second compressed package ,

  When looking at the properties, I didn't find   What useful information , Drag it into 010Editor.exe Search for flag

 flag{you_are_lucky_d0g}

CRYPTO

1、 Four Caesars or four fences

According to the title prompt, first decrypt the characters by Caesar , The title says four , Then the number may be 4

 

 

Then the decrypted characters will be decrypted , The number is still chosen 4,

 flag:slsec{55fb656d28c55e09ecc45424f952370f}

2、 Beautiful notes

Open file

 

  Because they are all decryption type topics , Search for notes and decrypt , Decrypt the characters in the file to get a string of characters

Characters consist of the case of letters and numbers base64 The encryption type of , And then decrypt it

SLsec{D0FA06CD93335C8CAE357FFE5CD1C4E9}

3、 Little rabbit

The title says little rabbit , So we went to search rabbit Decrypt Open file

 

Decryption requires a key. Today is a good day , Fill in the date of the day when you do the question , Decrypt .

SLsec{f330ad0d5bba3bab338d99a7b2ba81ca}

 WEB

1、 Sign in

Click the title link

F12 Key to view the source code

 

 

 SLsec{We1c0me__T0_SLsec_Recru1t new [email protected]}

2、EZphp

Open the title link

Look at the code , first if It means if a If it is a number, it stops running , the second if Means to a=8848, stay php In the weak type of ,php Will compare the number before the character with the number after the character , So you should not only input a=8848 Also enter one or more characters after

 

 SLsec{[email protected]@ge}