des encryption algorithm is a symmetric encryption algorithm, but in reality security is high enough

DES\.classpath
...\.project
...\des\E_converse.class
...\...\E_converse.java
...\...\F_diedai.class
...\...\F_diedai.java
...\...\Get_surface.class
...\...\Get_surface.java
...\...\Ipconverse.class
...\...\Ipconverse.java
...\...\K_pc1.class
...\...\K_pc1.java
...\...\Nip.class
...\...\Nip.java
...\...\P_converse.class
...\...\P_converse.java
...\...\S_box.class
...\...\S_box.java
...\...\Uncover.class
...\...\Uncover.java
...\...\test.class
...\...\test.java
...\des
DES

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