phanen / DES

c++ implementations of DES(Data Encrypt Standard) and it attack.

Introduction

Here is some c++ implementations of DES(Data Encrypt Standard) and it attack.

DES implementation

Two kinds of implementation are included.

1. A intelligible implementation based on the <bitset.h>.
2. A Faster implementation based on bit operation.

DES attack

The previous faster implementation was used.

Exhaustive search

It doesn't use complementary theory. Pure brute-forced.

Look-up table

In essence, the efficiency of this attack is no different from exhaustion

Differential attack

A advanced attack which was first published in the 1990s, which is challenging DES-like block cipher.