File list (Check if you may need any files):
secret
......\.classpath
......\.project
......\bin
......\...\com
......\...\...\linkage
......\...\...\.......\secret
......\...\...\.......\......\DESPlus.class
......\...\...\.......\......\ReadEnv.class
......\...\...\.......\......\Secret.class
......\src
......\...\com
......\...\...\linkage
......\...\...\.......\secret
......\...\...\.......\......\DESPlus.java
......\...\...\.......\......\ReadEnv.java
......\...\...\.......\......\Secret.java