Ctf steganography (1)

1. Mainly introduce the copy command in dos.

The copy command says to copy one or more files to another location, and in the process, we can copy the two files together so that a new file can be created.

Copy 2.jpg/b+2.txt/a 2.1.jpg

(cd\ enter the home directory, and then enter the folder. Remember to enter the folder where the file is located during the operation. )

The contents of the 2.txt file are stuffed into the picture, and in the hexadecimal view of the 2.1.JPG file, you can see that the contents of the txt file appear at the end of the jpg file.

2, when we view a file, we do not adhere to its current file format, if a file in the hexadecimal look-up appears .txt or .jpg and so on, then the original format of the file may be compressed package class files, we need to change the suffix name to .zip or .rar to view the content.