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Public Key Cryptography
The Caesar cypher just described is known as a symmetric cypher because the same key is used to encrypt and decrypt the message. In public key cryptography, the key used to decrypt a message is different (but mathematically linked) to the key used to encrypt the message. Public key cryptography is described as an asymmetric scheme, because the key used to decrypt the message is not the same as the key used to encrypt it. This makes it more secure. Using asymmetric cryptography, if you want to receive encrypted messages you create two mathematically linked keys: a public key and a private key. Together they are called a key pair. You can share your public key with the world, and anyone can use it to encrypt messages for you. You use your private key, known only to you, to decrypt those messages. Anyone who sends you encrypted messages using your public key knows that only you can decrypt them.
By Daniel Joseph 4 years ago in Education
Brainstorming for any satirical essay
Brainstorming is the first step in any essay writing process. For all essay writers, brainstorming is an important tool that can be used even when writing satirical essays ("Satire Essay," 2019,). There are many writing strategies that can be used in the planning stages, but there are also other options that are equally effective for satire writing. A bubble map is one of the most popular tools we use and love. A bubble map can be used in elementary schools. It associates words with your topic of interest. If you want to create a bubble map of Donald Trump for him, for example, you can use words such as father, husband, adulterer, divorcee, New York City and orange, bombastic, real-estate, and home alone.
By William Nielsen4 years ago in Education
HASHES
A hash function is a series of mathematical steps or algorithms that you can perform on some input data, resulting in a fingerprint, or digest, or simply, a hash. There are basic hash functions (not used in blockchains) and cryptographic hash functions (used in blockchains). We’ll need to understand basic hash functions before moving to cryptographic hash functions. Basic Hash Function A really basic hash function might be ‘Use the first character of the input’. So using this function you’d get: Hash(‘What time is it?’) => ‘W’ The input to this function is ‘What time is it?’ and is sometimes called the preimage or the message. The output of this function is ‘W’ and is called the digest, the hash value, or simply the hash. Hash functions are deterministic because the output is determined by the input. If a function is deterministic, it always produces the same output for any given input. All mathematical functions are deterministic (adding, multiplying, dividing, etc). Cryptographic Hash Functions A cryptographic hash function is special and has some characteristics that makes it useful in cryptography and for cryptocurrencies, as we will see later. Wikipedia70 states that the ideal cryptographic hash function has five main properties (my comments in parentheses): 1. It is deterministic so the same message always results in the same hash 2. It is quick to compute the hash value for any given message (you can easily go ‘forwards’) 3. It is not feasible to generate a message from its hash value except by trying all possible messages (you can’t go ‘backwards’) 4. A small change to a message should change the hash value so extensively that the new hash value appears uncorrelated with the old hash value (a small change makes a big difference) 5. It is not feasible to find two different messages with the same hash value (it is hard to create a hash clash) What does this mean? The combination of properties 2 (you can easily go ‘forwards’) and 3 (you can’t go ‘backwards’) means that cryptographic functions are sometimes called ‘trapdoor function’. It is easy to create a hash from a message, but you can’t re-create the input from the hash. Nor can you guess or infer what the message may be by looking at the hash (property 4). The only way to go backwards is to try every possible combination of inputs and see if the hash value matches the one you are trying to reverse. This is called a brute force attack. So would our previous hash function (‘Use the first character’) be a good cryptographic hash function? Let’s see: 1. Yes, it is deterministic. ‘What time is it?’ always hashes to ‘W’. Yes, it is quick to compute the output, you simply take the first character. Yes, by knowing only ‘W’ it is not feasible to guess the original sentence (but see 5). No, a small change in the message doesn’t necessarily change the output. ‘What time is at?’ also hashes down to ‘W’. No, we can easily create loads of inputs that will all hash down to the same output. Anything starting with ‘W’ will work. So our earlier hash function is no good as a cryptographic hash function. So what is a good cryptographic hash function? There are some established industry standard cryptographic hash functions that meet all of these criteria. They have names like MD571 (Message Digest) or SHA-256 (Secure Hash Algorithm), and they have an additional benefit in that their output is usually of a fixed length. This means that whatever you use as an input to the hash function, whether it is a sentence, a file, a hard drive, or an entire data centre, you will always get a short digest back.
By Daniel Joseph 4 years ago in Education
Debunking 4 Common Myths of College Majors
After I graduated with my undergraduate degree, I took on a role as an admissions counselor at my alma mater - my feeble attempt to make enough money to keep the lights on while I figured out what I wanted to do with my life.
By Brad Bartlett4 years ago in Education
Change your ineffective study habits
One of the biggest issues with reading study guides is that they lack structure. For example, I always studied bible study guides, but I was always disappointed by the lack of structure. Would I ever find it again? Of course not. When I started my own study guide, I designed it to be easy to follow, but also useful in the long run; and that’s exactly what I promised myself when it was created.
By Taimoor Khan4 years ago in Education
Jobs & Career after Learning the German language
Are you a polyglot anticipating a career in the language universe? If yes, here’s the good news for you! Learning a foreign language can take you a long way ahead in terms of career as well as intrapersonal development. So, why wait? Start today. Here, in this post, I'll walk you through the multitudinous possibilities in Jobs and Careers after Learning the German language. Ok, Why German might be the next question in your mind. Let us explore this a bit. Below are the pointers to depict the benefits of learning German.
By Tena Singh4 years ago in Education
What are The Most Important Chapters in Class 10 Science?
Class 10 is an important stage in every student's life. Scoring good marks is necessary for Class 10 students. Scoring good marks in the Class 10 Board Exam will help you to select your favorite stream, and get admission into a good school/college. So many students complain that they struggle to understand science and mathematics concepts.
By Aadi Narayan4 years ago in Education
Things You Should Know About Free Learning Apps for Kids
Learning applications for kids have arrived to save the day! When parents have educational games and learning apps to rely on, they find it much easier to teach their children basic concepts or revise those taught in school. Learning applications include benefits such as early learning for toddlers, social skills for preschoolers, and math skills for 6-year-olds. You may believe that each download will be too expensive and that it is preferable to teach them the traditional manner. So, guess what? There are numerous free learning applications available that will provide your children with access to some excellent preschooler learning games, SKIDOS being one of them. Here's everything you need to know about spelling games for kids and the different advantages they provide.
By skidos20214 years ago in Education
12 Facts You Need to Know About Free Learning Apps for Kids
Learning apps for children are here to save the day! Parents find that teaching kids basic concepts or revising the ones that have been taught in school are much easier when they have some educational games and learning apps to depend on. Early learning for toddlers, social skills for preschoolers, and math skills for 6-year-olds are only a few of the benefits of learning apps. You may think that every download will cost a fortune and it's easier to let them learn the traditional way. Well, guess what? There are loads of free learning apps that you will find that will give your kids access to some amazing educational games for kids, SKIDOS being one of them. Here's all you need to know about free learning apps for kids and the various benefits they bring to kids.
By skidos20214 years ago in Education
