In cryptography, the DES algorithm is a common block encryption algorithm, and it is the most widely used symmetric encryption algorithm. There are many encryption algorithms, and the DES algorithm is just one of them. So is the DES encryption algorithm safe? What are the advantages and disadvantages of the DES encryption algorithm? The following article will analyze and explain these issues, hoping to help everyone further understand the DES encryption algorithm.
What is DES encryption algorithm
DES encryption is a symmetric encryption algorithm, which is a relatively traditional encryption method. The encryption and decryption operations use the same key, and the sender of the message and the receiver of the message must jointly hold the password (called a symmetric cipher).
DES encryption principle
DES uses a 56-bit key with an additional 8-bit parity bit, resulting in a maximum block size of 64 bits. This is an iterative block cipher , using a technique called Feistel where the encrypted text block is split in half. Apply a loop function to one half using the subkey, then XOR the output with the other half; the halves are then swapped, and the process continues without swapping in the final loop. DES uses 16 loops and uses four basic operations: XOR, permutation, substitution, and shift operations. Is the
DES encryption algorithm safe? The
DES algorithm is extremely secure. In addition to using the exhaustive search method to attack the DES algorithm, no more effective method has been found. The exhaustive space for a 56-bit key is 256, which means that if a computer was capable of detecting one million keys per second, it would take nearly 2285 years to search for all the keys.
With the development and advancement of technology, the possibility of decrypting DES has become greater. Some netizens have tried to use the free decryption website online: https://md5.cn/ to decrypt DES. The operation method is simple. After opening the website and logging in to your account, click [Online Tools] - [DES Encryption and Decryption].
Then enter the ciphertext that needs to be decrypted:
U2FsdGVkX1/50h75q6vAEYxtBm68HJnSsXiTeWKpjO8lzTZvp2pxrg==
Then enter the key: 12345, and finally click decrypt to get the result: Let's go play together. Whether it can be solved is one thing. The key is where does the key come from? Advantages and disadvantages of
DES encryption algorithm
Advantages: The DES encryption algorithm key uses only 56 bits of 64 bits, which has higher security. So far, apart from using the exhaustive search method to attack the DES algorithm, no more effective method has been found. Disadvantages of
: relatively short grouping, too short key, short password life cycle, and slow operation speed.
In summary, the DES encryption algorithm is a relatively secure algorithm. The advantage of the DES algorithm is that it has high security and is often used in computer network communications, electronic fund transmission systems, user file protection, user identification and other fields. You can choose different encryption algorithms according to your needs.
