Brute-force with only half of the cipher text

[sverrets]

Hi!

I want to brute-force DES and recover the key. The problem is that I only have the first half of the cipher text, but the entire plain text.

Example:

• Plain text:    0000 0000 0000 0000
  
• Cipher text: 1111 1111 ???? ????
  

Is it possible to brute-force this and get all possible keys as output? I have another first half of a cipher text, so I then want to brute-force which of the first keys are used.

Is it something like this?

hashcat -m 14000 0000000000000000:11111111?????????? -o cracked.txt -a 3 -1 ./hashcat-3.40/charsets/DES_full.charset --hex-charset ?1?1?1?1?1?1?1?1 -w 3