Implement a symmetric cryptographic technique (1) In the single complete unit weight for a specific file DES encryption/decryption (2) for the DES key characteristics (8 bytes, 64 bits, which really works for 56 bits), a mechanism designed to generate a secret key (ie, the key used for each session are temporary randomly generated)

DES\.classpath
...\.project
...\.settings\org.eclipse.jdt.core.prefs
...\bin\DESUtil.class
...\out_file\DES_decrypt_result.txt
...\........\DES_encrypt_result.txt
...\src\DESUtil.java
...\test-1.txt
...\.settings
...\bin
...\out_file
...\src
DES

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