When running your own mail server you have complete control over its performance and reliability. Here is how to get started with an open-source mail server on AWS EC2.
How to verify the remaining validity of your letsencrypt certificates
In order to figure out how many days your letsencrypt certificates have left, you could check an online services such as:
https://www.ssllabs.com/ssltest/index.html
However, that won’t work for a mail server that’s not also running a web server using the same certificate.
In this case, your best bet is to check the certificate file directly using the openssl command as follows:
openssl x509 -noout -dates -in /etc/letsencrypt/live/smtp.yourmailserverdomainname.com/cert.pem
Maximize your PHP session security by fixing errors and closing the session adoption vulnerability that allows session fixation attacks
When the server can’t write to the session data directory, if will use /var/cache/nginx/fastcgi_temp/ and complain in the error log. You don’t want any of these errors, but a setting considered insecure will not even be reported as such. Here is how to bolster your PHP 7 session security with NGINX and php-fpm.
How to set up remote access via SFTP to a web server root directory on RHEL/CentOS/Fedora using key pairs
Your users want to access a web server instance as a staging or production environment for DevOps… They want access to the web server document root of the sites they manage. Your job is to maintain the integrity of the whole system in terms of cyber security.
If you happen to be running a web server on Linux—for example in EC2 on Amazon AWS—and need to provide site owners remote access in a secure and responsible manner, here is how to do it.
The crypto revolution: an interview with Professor Emin Gün Sirer and Dr. Ittay Eyal about Bitcoin, the blockchain, and FinTech innovation
In a research paper titled “Majority is not Enough: Bitcoin Mining is Vulnerable“, Professor Emin Gün Sirer and Dr. Ittay Eyal of the Department of Computer Science at Cornell University, revealed the Selfish Mining attack on Bitcoin’s blockchain back in 2014.
In this interview, Professor Sirer and Dr. Ittay Eyal demystify Bitcoin and other crypto currencies and provide a first glimpse into the blockchain revolution.
The interview was conducted by Anna E Kobylinska with contribution by Filipe Martins.
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