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A large numerical value that is used to encrypt data

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Generating RSA Private and Public Keys

We use SSH, HTTPS, etc., on a daily basis. These programs depend on RSA asymmetric key encryption and decryption for providing security.Asymmetric key encryption involves two keys, public key and private key. Public key is used for encrypting the message and Private key is used for decrypting the message.In this post, we will look into how a public key and private key pair are generated using simple mathematics.We will use small numbers for simplicity.Public Key ( e, n )Public key is made up of two numbers called e and n.Generation of nGenerate two prime numbers.Prime number 1, p = 7Prime number 2, q = 17n = p x qn = 7 x 17 = 119Thus n = 119Generation of eCompute totient of n, ϕ(n) = ( p -1) x (q -1)Choose a random prime number that has a greatest common divisor (gcd) of 1 with ϕ(n)ϕ(n) = ( 7 — 1 ) x ( 17–1 ) = 6 x 16 = 96Prime numbers between 1 and 96 are,2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89Lets us choose a random prime number that has a GCD of 1 with 96We cannot use 2, since 2 is the GCD for 96 and 2.We cannot use 3, since 3 is the GCD for 96 and 3.13 is a good number, since 1 is the GCD for 96 and 13.Now, we have got, e = 13Public Key ( e, n ) = ( 13, 119 )Private Key ( d, n )We have already generated n, which is 119. Now, we need to generate d.Generation of dd is the multiplicative inverse of (e) with ϕ(n)ie, find d, which is the multiplicative inverse of e (13) with 96e = 13, ϕ(n) = 96d * e ≡ 1 mod ϕ(n)d * 13 ≡ 1 mod 96i.e., ( d * 13 )% 96 should yield a remainder of 1This requires computing numbers one by one, until we find the right number. This is hard to do by hand, so let’s use a small python program to generate d,# Python program to find modular # inverse of a under modulo m # A naive method to find modulor # multiplicative inverse of 'e' under modulo 'm'def modInverse(e, m) : e = e % m; for x in range(1, m) : if ((e * x) % m == 1) : return x return 1 # Driver Programe = 13m = 96print(modInverse(e, m))37Computed value of d is 37Verify dd * e ≡ 1 mod ϕ(n)d = 37d * e = 37 * 13 = 48196 * 5 = 480481 % 96 = 1thus d * e ≡ 1 mod ϕ(n)Private Key ( d, n ) = ( 37, 119 )So FarWe have generated a public key and private key, using simple mathematics.Public Key ( e, n ) = ( 13, 119)Private Key ( d, n ) = ( 37, 119 )Generating RSA Private and Public Keys was originally published in Hacker Noon on Medium, where people are continuing the conversation by highlighting and responding to this story.
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Bobby Lee Shares How a Bitcoin Public Key For Fundraising Works Via QR Code

Bobby Lee: Bitcoin Public Key Great to Raise Money BTCC CEO Bobby Lee spoke at the Blockchain Cruise Conference in China and discussed the advantages of Bitcoin QR code. He mentioned that Bitcoin’s public key can be used to raise money. Essentially, the process can be facilitated by people creating QR codes for fundraising for causes such as natural disasters and the like. He also mentioned that the same method can be used to send money with Bitcoin account private key QR code. As he explained: So there is a QR code, there this long string . . . so what I just di is, share with you my public account and also my private key. So for those of you who are interested I’m actually giving away $100. So if you go and look on the blockchain, you’ll have $100 in that account. He noted that bitcoin money is in the cloud and that this is significant because bitcoins are moving on the blockchain. You know with all these blocks that keep coming up and it’s all on the cloud, it’s actually not here per say. Even if the private key is here, the private key is just the location, if you knew the password for the account. So this is going to be interesting. I’m curious to see what will happen in the future. He then continued to discuss that currently, the boarding control restricts people from carrying gold and money in currencies. People are required to declare if they are carrying more than $10,000 or 10,000 euros and they fail to do so, authorities can confiscate the funds. On the other hand, bitcoin and other cryptocurrencies prevent authorities from knowing how much a passenger is carrying with them. As he exemplified “For example I came into Barcelona yesterday on a plane, international flight. Did I bring a $100 worth Bitcoin? Did I bring a $1,000 worth of Bitcoin? Or did Bitcoin stay in the cloud? So, this would be interesting to see.”
Bitcoin Exchange Guide

Bitcoin [BTC] account public key is a great way to raise money, says Bobby Lee

During the Blockchain Cruise conference, Bobby Lee, the CEO of BTCC, one of the largest Bitcoin [BTC] exchange platform in China, spoke about the advantages of a Bitcoin QR code. Bobby Lee said that the public key of the Bitcoin account is a great way to raise money. People can put the QR codes to raise money for a natural disaster and people from across the globe can send money to the address, he added. He continued to say that the same method can also be used to send money with the use of the QR code of the Bitcoin accounts private key. He said: “So there is a QR code, there this long string… so what I just did is, share with you my public account and also my private key. So for those of you who are interested, I’m actually giving away a $100. So if you go and look on the blockchain, you’ll have $100 in that account.” Bobby stated that Bitcoin [BTC] is money in the cloud. According to him, this is important as the Bitcoins are moving around on the blockchain. He said: “… you know with all these blocks that keep coming up and it’s all in the cloud, it’s actually not here per say. Even if the private key is here, the private key is just the location, if you knew the password for the account. So this is going to be interesting. I’m curious to see what happens in the future.” The CEO continued to say that, at present, the boarding control restricts people to carry gold and money in currencies. People will require a clear sign from the authorities in order to carry $10000 or 10000 Euros. If failed, then the authorities can confiscate the money. Whereas, with Bitcoin and cryptocurrencies, the authorities will not know how much a passenger is carrying with them. Giving an example, Bobby said: “For example I came into Barcelona yesterday on a plane, international flight. Did I bring in a $100 worth Bitcoin? Did I bring in a $1000 worth of Bitcoin? Or did Bitcoin stay in the cloud? So, this would be interesting to see.” The post Bitcoin [BTC] account public key is a great way to raise money, says Bobby Lee appeared first on AMBCrypto.
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XRP, BAT and Dash are The Favorite Cryptos Among Uphold Users

A recent report published by Uphold revealed that the most popular tokens among its users are XRP, BAT, and DASH. The investment in these cryptocurrencies has increased considerably during the period from January 2018 to January 2019. According to information from AMB Crypto, Uphold reported that despite the sharp drop in the prices of cryptocurrencies, its user base reached record stats: Not only did they increase their userbase to more than 1 million registered users, but the number of funded wallets and transactions also grew by more than 2X compared to last year. The Uphold team revealed that altcoins played a special role in the growth of its platform. Dash had the highest increase, followed by Basic Attention Token and Ethereum. However other tokens such as BTC, LTC, and BTG also reported significant growth despite the negative performance of the markets: Holdings of all currencies increased materially over the period, but DASH and BAT were the 2018 standouts (up 281% and 183% respectively). Uphold also saw good growth in holdings of ETH (up 70%), BTG (up 54%), BTC (up 41%) and LTC (up 24%) Uphold Explains The Reasons Behind The Popularity of Every Token According to the firm’s analysis. The growth rate of BTC, LTC, and ETH was lower than last year. Apparently, the public lost interest in these cryptocurrencies to focus on other more attractive alts such as XRP, which grew from 0 to 39% from March 2018 to January 2019. Uphold Interface The growing interest in XRP is consistent with the intense media presence that Ripple has had in the community over the past few months. The launch of xRapid and the numerous partnerships with essential players in the world of finance increased the trading of this cryptocurrency which eventually reached number 2 in the global market cap. Something similar happened with Basic Attention Token. The cryptocurrency is strongly pushed by Brave browser. The popularity of the browser and the positive rating of several specialized sites, as well as the launch of BAT trading in Coinbase Pro, were critical for the token to become one of the favorites among Uphold users. Uphold finally attributed DASH’s growth to a successful campaign in which they made their philosophy have an important influence on the community. “DASH represents itself as digital money which can be used to make instant, private payments online or in-store using its secure, open-source platform hosted by thousands of users around the world.” The post XRP, BAT and Dash are The Favorite Cryptos Among Uphold Users appeared first on Ethereum World News.
Ethereum World News

New Shapeshift Crypto Exchange Rebrand Plans Announced by CEO Erik Voorhees at ETHDenver

At the recently held ETHDenver, ShapeShift CEO Erik Vorhees announced that his company would be undergoing a major rebranding exercise in 2019. The first step in this will take place on Monday, February 17, 2019. During this time, the exchange will begin holding a closed beta programme where selected users will be invited to test out a new and improved version of Shapeshift. The new version, Vorhees says, will focus on improving on the user experience. These improvements will include making the user interface simpler and synchronizing the use of all the exchange’s products including its cryptocurrency pricing tracker CoinCap. This Information was made available by the CMO of ShapeShift Emily Coleman. Besides making this announcement, Vorhees also spoke at a panel focused on leadership “in times of ambiguity.” In this panel, he was joined by founder of cryptocurrency micropayments service Earn.com Lily Liu, CSO of ethereum venture capital studio ConsenSys Sam Cassatt, and co-founder of decentralized application platform Holochain Arthur Brock. Tough Calls As part of the discussion, the panelists were asked what the hardest decision was that they have had to make in the running of the business. “If you’re going to be a company in the crypto industry, you’re attached to the severe market cycles of the industry. That’s full of good and bad,” said Voorhees. Vorhees, on his part, said that the hardest decision he had had to make was the introduction of know-your-customer protocols on the exchange last year. “I felt like I had to do something morally wrong to allow the company to persist…It’s a really awful position to be in,” said Voorhees. According to Vorhees, the decision was a hard one because he was personally against the idea of asking users to give up their personal information. He eventually conceded to the decision as a form of picking and choosing his battles and considering the long-term implications. Despite the tough decision that was made, Vorhees is still confident that, in the future, people will be able to carry out transactions in a completely decentralized manner and without any censorship or interference. “Society is comfortable about this idea that people should be able to talk freely with each other … the fact that money is treated differently is a huge injustice. I hope that crypto breaks that discrepancy,” he said. Despite the CEO’s optimism, the company has faced some challenges in recent times, especially with having to lay off a third of its staff due to the crypto price slump.
Bitcoin Exchange Guide

Federal Judge in Crypto Proceeding Re-examines Blockvest (BLV Token) Case

In November of 2018, a California federal judge refused to approve a preliminary injunction as was requested at the time because there were a few inquiries and it was yet to be determined if, based on the Howey Test, the token in the case was a security. However, the same judge seemed to have re-assessed the situation and has made the decision to grant a motion the SEC’s requested, for Partial Reconsideration. Details of the Case The SEC, at the time, had charged a few offenders on account of transacting business involving sales of securities that were unapproved and not registered. The tokens, called BLV tokens, were defended by their stakeholders with the claim that they had been pre-approved by the CFTC, the National Futures Association and even the SEC. The accused also claimed on their website, that they had received approval from an agency called the “BEC”, although that seemed to have been fabricated. The Re-Assessment Generally, it almost never happens that during a prosecution, a federal judge will have a change of mind. This only happens when a motion for re-examination has been put forward. However, when a case has new evidence or laws have been changed or wrongly applied, a judge could consider a change of mind. The judge has now decided that the information on the accused’s website contained offers for transacting in unapproved tokens and this still holds water whether or not a transaction was completed. The Howey test is a divided into three parts and all three were violated. The accused expressed their opinion that an injunction is too much of a response from the courts especially because some progress had been made regarding admittance of guilt, an addition of a proper counsel to the team and the decision for these people not to do an ICO. However, the court did not agree especially because of the made up agency – BEC – and many other different falsities. The court also considered the possibility that the accused might not discontinue all the wrongdoings. Reactions to the case and the court rulings have been polar with some proclaiming it as appropriate while other have expressed that it might be an overreaction.
Bitcoin Exchange Guide

Top 5 Crypto Performers Overview: Dash, Neo, Binance Coin, EOS, Ethereum

Top 5 Crypto Performers Overview: Dash, Neo, Binance Coin, EOS, Ethereum Argentina has recently settled an export deal with Paraguay in Bitcoin. Although the net value of the deal was only $7,100, it is a welcome step. Gradually, more countries will recognize the advantage of using cryptocurrencies for cross-border deals. Digital asset management fund Grayscale […] Cet article Top 5 Crypto Performers Overview: Dash, Neo, Binance Coin, EOS, Ethereum est apparu en premier sur Bitcoin Central.
Bitcoin Central
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