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One way functions that transfer character inputs to compressed output value named as hash functions. The input can be infinite(arbitrary), but the output always has a finite(fixed) set of characters. This produces a fingerprint of the file/message/data source: Wikipedia You cannot reverse the function and get the input value in Hash functions. If you have the content, you can use the hash function to calculate the hash value, but the other way around is not possible. If you have the hash value and the function, you can’t use it to get the input text. Below are sample scenarios that hash functions may become useless. If the function is reversible, it’s not secure. Hash values can be exposed to the public. Hence we don’t want someone seeing the hash value. The values may not collision resistant. There may be use cases with two unique input values return the same hash value. Since digital certificates/Signatures using hash fun...

Hello there! This time I’m going to discuss one of the projects I got involved recently. The team is expanding the operations to a new operator and we need to deploy the platform in new servers. One instance is to create database replications in MySQL. Below is the environment I’m working on Master and Slave are CentOS Linux release 7.4 Linux Servers.  Master IP Address is 192.168.100.1.  Slave IP Address is 192.168.100.2.  Master and Slave are on the same LAN network.  Let’s install MySQL on the master server and configure 1. For CentOS 7 and Red Hat (RHEL) 7 yum localinstall https://dev.mysql.com/get/mysql57-community-release-el7-11.noarch.rpm 2. CentOS 7.4/6.9 and Red Hat (RHEL) 7.4/6.9 yum install mysql-community-server 3. Start MySQL server and auto start MySQL on boot. Below commands can be used in Fedora 27/26/25 and CentOS 7.4 and Red Hat (RHEL) 7.4 systemctl start mysqld.service systemctl enable mysqld.service But I couldn’t log in to the MySQL by ...