01-04-2018, 02:02 PM
Hi
I want to brute force a key while I only have access to some cipher texts and some bytes of the corresponding plain text.
The cipher texts are 64 bit encrypted DES and the values of two specific bytes of each corresponding plain text is unknown.
1) Can I use hashcat or libhashcat?
2) Is there an easy way to modify hashcat to do this?
My idea is using decryption with all possible keys and comparing some bytes of the resulting output with the known bytes of plain text. We do the aforementioned search by decryption on one block (cipher text/plain text) and check the candidate keys on next block to find the correct key.
Any idea???
I want to brute force a key while I only have access to some cipher texts and some bytes of the corresponding plain text.
The cipher texts are 64 bit encrypted DES and the values of two specific bytes of each corresponding plain text is unknown.
1) Can I use hashcat or libhashcat?
2) Is there an easy way to modify hashcat to do this?
My idea is using decryption with all possible keys and comparing some bytes of the resulting output with the known bytes of plain text. We do the aforementioned search by decryption on one block (cipher text/plain text) and check the candidate keys on next block to find the correct key.
Any idea???