A certificate authority (CA) is who issues the digital certificates. We need this for installation of some software, such as OpenVPN. For doing that, we have to download the latest version of EasyRSA. EasyRSA is the CLI utility to build and manage a PKI CA. A CA acts as a trusted 3rd party. The format of these certificates is specified by the X.509 standard. A certificate signed by a … [Read more...]
Computer and Internet
Computer and Internet is catchall section of core computing categories including Cloud Computing, Digital Photography, Virtualization, Networking, Protocols and Others' which are not otherwise more subcategorized. Here also you will get unique articles and news on computer hardware, Software, Networking and Protocols.
Theory for Running OpenVPN on Server
OpenVPN is a free software for building a Virtual Private Network (VPN) via an encrypted TLS connection. For encryption OpenSSL or mbed TLS can be used. OpenVPN uses either UDP or TCP for transport. OpenVPN is under the GNU GPL and supports the Linux operating systems, Solaris, BSD, MacOS, QNX, Windows, Android, iOS. Also, there are customized implementations for a variety of Linux-based … [Read more...]
What is Asymmetric Cryptography?
Asymmetric cryptography or two-key cryptography is the cryptographic method that a pair uses of keys for sending messages. The two keys belong to the same person who will receive the message. One key is public and can be delivered to anyone, the other key is private and the owner must keep it so that no one has access to it. In addition, cryptographic methods guarantee that this key pair can only … [Read more...]
Apache Cassandra Versus Apache Phoenix
In our previous discussions, we have compared Apache Cassandra with Apache Hbase and Apache Cassandra with MongoDB. In one of those articles, we already mentioned that Apache Cassandra is more appropriate to compare with Apache Phoenix than Apache HBase. Also, it will make understand why commonly HBase is compared with Apache Cassandra, not Apache Phoenix. Apache Phoenix is a relational … [Read more...]
Apache Cassandra vs Apache HBase
In the last article we have compared Cassandra with MongoDB. That comparison made it obvious that we need to compare Cassandra with HBase, and MongoDB with HBase to complete the understanding. Cassandra and HBase are similar at many things but Cassandra's consistency model is like DynamoDB to provide eventual consistency. HBase is a part of HDFS which runs on top of Hadoop (based on … [Read more...]
MongoDB vs Cassandra : Comparison of NoSQL Databases
Previously we compared DynamoDB and MongoDB. MongoDB vs Cassandra is another frequently compared NoSQL database. Apache Cassandra is fully Free and Open Source Software which provides scalability. MongoDB is developed by MongoDB Inc, it has other options than just the MongoDB Open Source Software we commonly use. Apache Cassandra has scalability, linear performance, distributed architecture, … [Read more...]
What’s the Difference Between Hadoop and Spark?
Both Apache Hadoop and Apache Spark are big-data frameworks, but they do not serve the same purposes. Actually there are multiple big data frameworks on the market, Apache and Hadoop and Apache Spark are most known among them. They are commonly used to train the starters. But in real life, choosing the right big data framework is a challenge. Businesses consider each of the framework for their … [Read more...]
What is Scaled Agile Framework (SAFe)?
Scaled Agile Framework (SAFe) is an organization and process schema for large-scale deployment of Agile and Lean methods. SAFe tries to answer the problem of large organizations (companies or administrations) who wish to work together several Agile teams. SAFe also aims to deploy Agile and Lean culture and practices across all layers of the organization, from management to developers. Inspired … [Read more...]
What is Predictive Analysis?
Predictive analysis is a group of analysis which uses machine learning, data mining, statistical algorithms to analyze data to make predictions. The goal of predictive analysis is to cross the capability of descriptive statistics and reporting and provide the best assessment on what will happen in the future. The end result helps in streamline decision making and produce new insights. Predictive … [Read more...]
Influence of the Internet of Things (IoT) on Retail : Part IV
This is the forth part on the series on Internet of Things (IoT). The use of IoT technologies in retail enables a multitude of new opportunities and offers great benefits. At the same time, however, it also brings dangers with it. The main benefits are the economic advantages for the dealer and the added value for the customer. However, the security of the Internet of Things, as well as the … [Read more...]
Influence of the Internet of Things (IoT) on Retail : Part III
This is the third article of this series. In the second part of the article on Influence of the Internet of Things on Retail, we have discussed some of use-cases. In this part, we will discuss the rest of the use-cases i.e. Logistics and Online trading. In addition to the actual sale, the processes in the supply chain offer a high potential for optimization. In particular, in the areas of … [Read more...]