(6) Web security | penetration test | network security encryption and decryption ciphertext related features, with super encryption and decryption software

Super encryption and decryption tool ：

link ：https://pan.baidu.com/s/1lmi8bF5N5_cIYT6QG99TDQ 
Extraction code ：hj12

Many common web addresses are encrypted , prevent sql Inject

Analysis of common encryption and coding algorithms

MD5,SHA,AES, Base number , Time stamp ,URL,BASE64,Unescape,DES etc.

Understand the characteristics of conventional encryption algorithms

Length digits , Character law , The code analysis , Search for, etc

md5 encryption （ Default 32 position , Irreversible ）

After encryption is 16 Bit or 32 A character , It consists of letters and numbers , Letters are case sensitive , Theoretically, it cannot be decrypted , Unless we crack it violently

SHA encryption

SHA-1 The encrypted ciphertext is 40 Characters , And it is composed of numbers and letters

SHA256     64 Character composition

SHA384    96 Character composition

SHA512   128 Character composition

（1 The letters seem to be lowercase , I don't know if I haven't encrypted enough ）

 

AES encryption

  The larger the number of data blocks , More output

128 position   base64 Output 24 position   hex Output 32 position

192 position   base64 Output 32 position   hex Output 48 position

Time stamp

Time stamp (Unix timestamp) Transformation tool - Online tools (tool.lu)

 

URL encryption

The code is characterized by a string % Two character style .

URL The encoding is a character ascii The hexadecimal of the code , Then you need to add “%”.

for example “\”, its ascii Code is 92,92 The hexadecimal of is 5c, therefore “\” Of URL The encoding is %5c.

 

BASE64

  The length characteristic of ciphertext string is 4 Integer multiple . The symbolic value of string can only be A-Z, a-z, 0-9, +, /, = total 65 Of the characters , And = If it appears, it must appear at the end .

Analysis of common encryption forms and algorithms

Direct encryption , belt salt, With the code , With offset , Band number , Band mode , With interference , Custom combination, etc

Common decryption methods

enumeration , Custom reverse algorithm , Reversible （ Is to use various tools ）