oclHashCat

Posted by & filed under Numbers, Programming, Security.

I was doing some webapp security audits and needed to use hashcat to attack a few hashes. Definitely a must have when dealing with hashes of any kind.

  • Worlds fastest password cracker
  • Worlds first and only GPGPU based rule engine
  • Free
  • Multi-GPU (up to 128 gpus)
  • Multi-Hash (up to 15 million hashes)
  • Multi-OS (Linux & Windows native binaries)
  • Multi-Platform (OpenCL & CUDA support)
  • Multi-Algo (see below)
  • Low resource utilization, you can still watch movies or play games while cracking
  • Focuses highly iterated modern hashes
  • Focuses dictionary based attacks
  • Supports distributed cracking
  • Supports pause / resume while cracking
  • Supports sessions
  • Supports restore
  • Supports reading words from file
  • Supports reading words from stdin
  • Supports hex-salt
  • Supports hex-charset
  • Built-in benchmarking system
  • Integrated thermal watchdog
  • 80+ Algorithms implemented with performance in mind
oclhashcat

An Interactive Guide To The Fourier Transform

Posted by & filed under Numbers.

Yikes. Rather than deciphering it symbol-by-symbol, let’s experience the idea (hear the song then read the sheet music, dig?).

fourier_transform

Let’s start with a plain-English metaphor:

What does the Fourier Transform do? Given a smoothie, it finds the recipe.
How? Run the smoothie through filters to extract each ingredient.
Why? Recipes are easier to analyze, compare, and modify than the smoothie itself.
How do we get the smoothie back? Blend the ingredients.
Next, we’ll refine the analogy into “math-English”:

The Fourier Transform extracts each “cycle ingredient” from a time-based signal (the cycle strength, delay & speed), resulting in a final “cycle recipe”

betterexplained.com/articles/an-interact…