DES encryption and decryption tool

DES encryption and decryption tool Introduction

1. Data Encryption Standard (DES) is a symmetric key encryption algorithm developed by IBM.

2, DES is a block cipher, it divides the plaintext data into 64 bit blocks, and uses the 56-bit key to encrypt these blocks.

3, the key length of DES is 56 bits, but in fact, one out of every eight bits is used for parity, so the effective key length is 56 bits.

4. The DES algorithm has some security problems, such as the key length is too short, the encryption mode is attacked, and the sub-key generation algorithm may lead to some weak keys.