Detailed parsing Data Encryption

Data Encryption terminology

Plaintext: Raw or unencrypted data. The encryption algorithm is used to encrypt it. The input information of the encryption algorithm is plain text andKey;

Ciphertext: Plaintext encrypted format, which is the output information of the encryption algorithm. The encryption algorithm is public, while the key is not public. Ciphertext, which should not be understood by keyless users for data storage and transmission.

For example, the plaintext is a string: as kingfishers catch fire is easy to use. Assume that the data processed is only uppercase letters and spaces ). Assume that the key is a string: ELIOT

Data Encryption Algorithm

1) block space characters that divide plaintext into multiple Key Strings in length are expressed as "+)

 
 

  
  
AS+KI NGFIS HERS+ CATCH +FIRE 
 
 

2) 00 ~ An integer in the range of 26 replaces each character in the plain text. The space character is 00, A = 01,..., Z = 26:

 
 

  
  
0119001109 1407060919 0805181900 0301200308 0006091805 
 
 

3) Replace each character of the key in the same way as Step 2:

 
 

  
  
0512091520 
 
 

4) for each block in the plain text, replace each character with the corresponding integer encoding and the integer encoding of the character at the corresponding position in the key and the value after the modulo 27:

5) Replace the integer encoding in the result of step 4 with its equivalent character:

 
 

  
  
FDIZB SSOXL MQ+GT HMBRA ERRFY 
 
 

If a key is provided, the decryption process in this example is very simple. The problem is how difficult it is for a malicious attacker to obtain a key using a matched plaintext or ciphertext without knowing the key? For the simple example above, the answer is quite easy, not general, but the complex encryption mode is also very easy to design.

The best case is that the encryption mode allows attackers to pay far more than the benefits they obtain for cracking. In fact, this objective applies to all security measures. The acceptable final goal of this encryption mode is that even the inventor of this mode cannot obtain the key through the matching plaintext and ciphertext, and thus cannot crack the ciphertext.

The introduction of encryption technology is complete, and we hope you can solve it. For more information, see: Detailed parsing of Data Encryption

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