Deepak Prasad

People say they know what SQL injection is, but all they have heard about or experienced are trivial examples. SQL injection is one of the most devastating

Step by step instructions to revoke or delete certificate from keystone and generate CRL Certificate Revocation List) using openssl in Linux with example openssl generate crl.

Create SAN certificate using openssl generate csr with san command line. Openssl sign CSR with Subject Alternative Name. openssl add san to existing certificate

Steps to create client certificate and server certificate using your own Certificate Authority chain (CA bundle) and configure Apache with SSL (HTTPS)

Learn how to generate a ca certificate and how to sign a certificate using openssl. Steps to create certificate authority CA and CSR with openssl

Steps to generate csr (certificate signing request) using openssl in Linux with examples. Create private key with and without passphrase.

Technically you can't renew expired root CA certificate instead you can create a new root ca certificate using private key with openssl. The new root CA certificate can be used to verify old certificates.

Step by Step instructions to renew SSL or TLS certificate (server/client) using OpenSSL command. Retain all SAN fields with X.509 extensions during renewal of certificate.

Step by Step instructions to renew self-signed certificate using OpenSSL command. Export CSR using expired certificate and using existing private key we can renew any kind of certificate

Step by Step instructions to use shell script to generate certificates with openssl. generate both self signed and rootCA signed certificates using bash or shell script without any prompt.

We must consider some important point when creating CSR or else we may face issues later while using the certificate

Step by Step instructions to manually expire any certificate using openssl. Different commands and methods to generate an expired certificate

Detailed comparison between openssl ca vs openssl x509 command with examples. Similarities and difference between ca vs x509 argument of openssl command

Step by Step instructions to add X.509 extensions to certificates, CSR, RootCA using openssl command.

Step by step instructions to generate duplicate certificates with OpenSSL CA using the same CSR with same Subject (Common Name) in all the certificates

Step by step guide to revoke missing or lost certificate using openssl. We can manually update the CA database to mark any certificate revoked and generate CRL

Install an SSL certificate on Nginx in just 4 steps. Secure your website with HTTPS and gain the trust of your visitors with a valid SSL certificate.

Step by Step instruction to install tor browser on Linux. Two different methods to install and launch tor browser using terminal

Top 10 Open-Source Vpn Software for Linux. Check out our list and the pros and cons for every VPN software and choose what suits you best.

Escaping single quotes in SQL is necessary once you want to include a literal single quote character (') in a string within your SQL queries. This is

Updating multiple columns in an SQL database is often done using various ways depending on the requirements. Here I will cover some of the most common and

Step by Step guide to upgrade or migrate CentOS 7 and 8 to Rocky Linux 8. There will be no data loss during the migration.

The process of upgrading from CentOS 7 to CentOS 8 is not straightforward. There are significant differences between the two versions, including the

MAC Spoofing is the process of changing the Media Access Control (MAC) address of a network interface on a device that’s connected to a network. The MAC

Lately while working on Kali Linux I encountered this error when trying to execute yersinia -G and the Yersinia GUI was not working.

ARP (Address Resolution Protocol) is a key network protocol used in IPv4 networks to link IP addresses to their corresponding MAC addresses. It plays an

DNS Cache Poisoning is an attack that's also known as DNS Spoofing. It's a type of cyber attack where hackers exploit vulnerabilities in the Domain Name

Imagine being at a cafe with a friend, trying to have a conversation when all of a sudden, a group of people come in and start shouting. You can’t even hear

Metasploit is a mighty and elastic framework that you can use in the development, examination, and implementation of exploits. In 2003 H.D. Moore created it,

Credential attacks are a type of cybersecurity threat that focuses on one thing: gaining unauthorized access to systems or networks. Attackers do this by