Privacy coin is the name given to cryptocurrencies that enable digital anonymous payments (digital cash). Bitcoin was still considered a privacy coin at the beginning of its launch, and it found its application as a means of payment on numerous darknet marketplaces. However, due to the increasing integration of cryptocurrencies into existing government payment systems, regulatory requirements, … [Read more...]
How Can I Take Better Pictures With My Samsung Galaxy S24 Ultra?
The Galaxy S22 Ultra and Galaxy 23 Ultra were powerful phones with great cameras. However, the camera has been better in Samsung Galaxy S24 Ultra with the updates. In S22 and S23 Ultra, you had to apply the updates and install a few Samsung apps to get all the features. However, a few tricks can get the most out of the features of the hardware and take great photos every time. The sets are … [Read more...]
Configure WordPress on Ubuntu 22.04 to Send Emails
To follow this guide, you need configure msmtp by following our previous guide. After following this guide, WordPress PHP and installation will be able to send you email. Check Whether PHP Can Send Emails Using mSMTP We need to test whether the php mail() function is working or not. Create a php script like the one below on your server, edit the required fields and save it … [Read more...]
What Are Fediverse and ActivityPub
Fediverse refers to a network of federated, independent social networks, microblogging services and websites for online publication or data hosting. The concept emerged in 2008 with StatusNet on Identi.ca and from 2012 with GNU Social, and in 2016 it became increasingly widespread with Mastodon and the ActivityPub communication protocol defined by the World Wide Web Consortium (W3C) in 2018. … [Read more...]
How to Add a SSH Pre-Login Message in Ubuntu 22.04
An SSH Pre-login message can deliver a legal warning to unauthorized users. If the response after typing root@ip.address displays only the password: field, then an attacker's advocate in the court may argue that we have not warned his/her innocent client. Of course, you must enable a Passwordless SSH Login method whenever possible, even add a Bastion host for login purpose. But, we can not use … [Read more...]
Basics of Mail Server and Mail Transfer Agent (MTA)
In contrast to telephone or Internet relay chat, which enable simultaneous (synchronous) communication, e-mail – like letter mail – is an asynchronous communication medium: the sender sends his message regardless of whether the recipient can receive it immediately or not. A mail server is a server that can receive, forward, hold, and send emails. The e-mail addresses whose e-mail mailboxes are … [Read more...]
Basics of Configuration File
A configuration file is a file on a computer that stores certain settings (the configuration) of computer programs or hardware components. The use of simple text files in the usual encoding on the respective operating system, such as ASCII or UTF-8, is widespread, so that they can be edited with a wide variety of programs, e.g. any text editor or on the command line. Configuration files can also … [Read more...]
Set Up Email with mSMTP on Ubuntu 22.04 Server
This is a sendmail emulator system which delivers email from a local computer to an SMTP server. This method avoids the usage of cloud-based transactional email subscriptions. This is useful if you already using a paid tier of Outlook Gmail or Zoho for your domain. In other words, you'll get domain-branded, whitelisted email from your server to your mailbox. Normally we need server cron and … [Read more...]
How to Optimize Apache Keepalive Settings (Ubuntu Server + WordPress)
In our earlier articles, we have discussed How to Install Apache and PHP on Ubuntu 22.04 Server and What is Keepalive in the Context of Apache Webserver. From the previous articles, we have learned that: Keepalive is a mechanism in data transmission with the goals of maintaining a network connection and convincing oneself of the accessibility and function of a communication partner. Keepalives … [Read more...]
What is Keepalive (in the Context of Apache Webserver)
Keepalive is a mechanism in data transmission with the goals of maintaining a network connection and convincing oneself of the accessibility and function of a communication partner. Keepalives are usually specific packets of a network protocol. A keep-alive signal is often sent at predefined intervals. If no response is received after a signal is sent, it is assumed that the connection is lost, or … [Read more...]
What is Data Packet
In data processing, a data packet is a compilation of related digital data, precisely defined by the communication protocol, which is sent through a data network during data transmission. This packet transmission is common in all forms of the Internet and is the basis for the functioning of the networks. Internet data packets have a 24-byte header. A data packet has a prescribed number of bits. … [Read more...]