An Overview of Cryptography As an aside, the AES selection process managed by NIST was very public. A similar project, the New European Schemes for Signatures, Integrity and Encryption (NESSIE), was designed as an independent project meant to augment the work of NIST by putting out an open call for new cryptographic primitives. NESSIE ran from about 2000-2003. While several new algorithms were found during the NESSIE process, no new stream cipher survived cryptanalysis. CAST-128/256: CAST-128, described in Request for Comments (RFC) 2144, is a DES-like substitution-permutation crypto algorithm, employing a 128-bit key operating on a 64-bit block. A digression: Who invented PKC? 3.3. Let me reiterate that hashes are one-way encryption. Hash algorithms that are in common use today include: Message Digest (MD) algorithms: A series of byte-oriented algorithms that produce a 128-bit hash value from an arbitrary-length message. A digression on hash collisions.
If You're Too Busy to Meditate, Read This This morning, like every morning, I sat cross-legged on a cushion on the floor, rested my hands on my knees, closed my eyes, and did nothing but breathe for 20 minutes. People say the hardest part about meditating is finding the time to meditate. This makes sense: who these days has time to do nothing? It’s hard to justify. Meditation brings many benefits: It refreshes us, helps us settle into what’s happening now, makes us wiser and gentler, helps us cope in a world that overloads us with information and communication, and more. How? Research shows that an ability to resist urges will improve your relationships, increase your dependability, and raise your performance. Our ability to resist an impulse determines our success in learning a new behavior or changing an old habit. As it turns out, that’s one of the things meditation teaches us. When I sat down to meditate this morning, relaxing a little more with each out-breath, I was successful in letting all my concerns drift away.
Top Ten Myths About Evolution Steven Dutch, Natural and Applied Sciences, University of Wisconsin - Green Bay First-time Visitors: Please visit Site Map and Disclaimer. Use "Back" to return here. 1. Humans Evolved From Monkeys Humans and great apes had a common ancestor about 5 million years ago Humans and monkeys had a common ancestor about 50 million years ago. 2. “Theory” does not mean “hypothesis” or “guess” “Theory” means an organized set of related ideas. Number Theory is the branch of mathematics that deals with the properties of numbers. 3. If you find your house trashed and your TV and stereo missing, will you hesitate to call the police because nobody saw it happen? 4. Maybe not. 5. Critics of evolution are fond of citing Piltdown Man or Nebraska Man (actually the tooth of a fossil pig erroneously claimed to be human). “Survival of the Fittest” was borrowed by Darwin from the economic writings of Herbert Spencer. 6. This is a claim for which there is a monosyllabic definition: lie. 7. 8. 9. 10. 11.
I want sparks & I want them NOW! Update May 2003 - Marx Three is now up & running Do you like the idea of tesla coils and other high-voltage sparking stuff, but don't have the time, money or patience to build something that elaborate? Here's a fun little project that can make big, fat, noisy sparks at least 2 inches long, and can be built very quickly and cheaply. The Marx generator consists of an array of resistors, capacitors and spark gaps arranged as follows: The capacitors, C, are charged up in parallel via the 1M (one megohm) resistors, so they each become charged to the input voltage. Rb has a ballasting effect. Although it is possible to make a Marx generator with just an array of resistors, capacitors and spark gaps, it can be hard to make it fire reliably, as it will depend on the breakdown voltage of the spark gaps, and there can be a fine line between not firing and firing before all the capacitors are fully charged. Component choice An input voltage of about 4-8KV is recommended. Power supply "Marx Two"
The Right Way to Respond to Failure My wife Eleanor and I were visiting some friends on a Saturday when their nine-year-old daughter, Dana*, came home. She was close to tears, barely holding it together. “Oh sweetie,” her mom said. Dana is an excellent swimmer. It isn’t like that for all her endeavors. “I was disqualified,” she told us. We were in the foyer of the house and she sat down on the bottom stair of the staircase, her swim bag still on her shoulder, staring into space, almost expressionless. “Honey,” her dad said, “there are a lot more swim meets in the season. I told her, “The fact that you left the block prematurely means you were at your edge. “Every swimmer on every team has been disqualified at some point,” Eleanor said. “I’m sure your coach will help you practice your starts before the next meet,” her mom said, “and you’ll figure out exactly when to spring off the block so that you don’t waste a second but you don’t dive too early either. Nothing we said seemed to have any impact on her. Empathy. Almost.
Top 40 Useful Sites To Learn New Skills The web is a powerful resource that can easily help you learn new skills. You just have to know where to look. Sure, you can use Google, Yahoo, or Bing to search for sites where you can learn new skills , but I figured I’d save you some time. Here are the top 40 sites I have personally used over the last few years when I want to learn something new. Hack a Day - Hack a Day serves up fresh hacks (short tutorials) every day from around the web and one in-depth ‘How-To hack’ guide each week.eHow - eHow is an online community dedicated to providing visitors the ability to research, share, and discuss solutions and tips for completing day-to-day tasks and projects.Wired How-To Wiki - Collaborate with Wired editors and help them build their extensive library of projects, hacks, tricks and tips.
Lucid Dreaming/Using Dream stabilization[edit] Once you are able to dream lucidly, you may find that it is difficult to stay in the dream; for example, you may wake instantly or the dream may start “fading” which is characterized by loss or degradation of any of the senses, especially vision. Alternatively, a new lucid dreamer could easily forget that they are in a dream, as a result of the shock of the sensation. Don't worry if you wake immediately after becoming lucid. You can avoid more gradual fadings by stimulating your senses. Ideally you should be able to use the techniques below to stabilize your dream before it starts to fade (or “black out”). If you still can’t stabilize your dream, you may decide to try and wake up with the aim of remembering your dream as accurately as possible while its still fresh in your mind. Hand Touching[edit] Rub your hands together and concentrate on the rubbing. Spinning[edit] You spin around in your dream much as you would if you suddenly want to feel dizzy in real life.
47 Mind-Blowing Psychological Facts You Should Know About Yourself I’ve decided to start a series called 100 Things You Should Know about People. As in: 100 things you should know if you are going to design an effective and persuasive website, web application or software application. Or maybe just 100 things that everyone should know about humans! The order that I’ll present these 100 things is going to be pretty random. So the fact that this first one is first doesn’t mean that’s it’s the most important.. just that it came to mind first. Dr. <div class="slide-intro-bottom"><a href="