Thought your Windows password was safe? Well, think again. As processors are getting faster and more powerful, password cracking is becoming much easier. Ophcrack is a free, open source hash cracker (similar to brute force cracking but uses precomputed tables). Ophcrack uses RainbowTables, an implementation of Philippe Oechslin‘s faster time-memory trade-off technique, to compute hash tables and crack your password in about 30 minutes (depending on your processor).