by İsmail Baydan · Published 27/03/2018
Nagios is an open source system, network, application monitoring system. Nagios is designed to be run on Linux operating system or distributions like Ubuntu, Debian, CentOS etc. Architecture and Components Nagios is not a single component to run. Nagios is actually a suite which provides following components. Nagios IX Nagios...
by İsmail Baydan · Published 25/03/2018
OpenSSL is most popular open source cryptography library which provides a lot of tools, libraries, algorithms about cryptography. It is mostly known with Secure Socket Layers (SSL) and Transport Layer Security (TLS) protocols. Supported Encryption Algorithms Encryption is used to make given data unreadable by the intruders. It is mainly...
by İsmail Baydan · Published 28/11/2017
nmap is very popular network scanning tool. Windows operating systems like 7, 10, Server are most used operating systems too. But we know that these two popular things do not meet together in most of time. nmap is by default provided by most of the Linux distributions like Fedora, Ubuntu,...
by İsmail Baydan · Published 01/11/2017
ddrescue is a GNU provided data recovery tool.It can copy and recover file, directory or whole hard drive. The best part of the ddrescue is it can prevent or solve read errors. Install For Ubuntu, Debian, Kali and Mint We can install ddrescue tool for deb based distributions like below....
by İsmail Baydan · Published 31/10/2017
User PC and Servers process a lot of data where some of them are secret. This data may be deleted with conventional ways but this may not enough. Because file systems generally removes file metadata but continue to hold real data. Microsoft sysinternals provides sdelete or secure delete tool which...
by İsmail Baydan · Published 17/08/2017
OpenSSL provides read different type of certificate and encoding formats. OpenSSL supports certificate formats like RSA, X509, PCKS12 etc. We will look how to read these certificate formats with OpenSSL. Read RSA Private Key RSA is popular format use to create asymmetric key pairs those named public and private key....
by İsmail Baydan · Published 17/08/2017
OpenSSL provides cryptographic libraries and features. We can use OpenSSL from reading DER files to generate random numbers. But one of the most used feature is creating a Self Signed Certificate. , Self Signed Certificate X509 is the certificate standard used in internet and corporate today. X509 certificates are designed...
by İsmail Baydan · Published 17/08/2017
DER and PEM are formats used in X509 and other certificates to store Public , Private Keys and other related information. OpenSSL provides a lot of features for manipulating PEM and DER certificates. We can use OpenSSL to convert DER to PEM format and vice versa. Convert DER Format To...
by İsmail Baydan · Published 17/08/2017
OpenSSL is very long running project which have passed a lot of versions. Newer versions provides more features, bug fixes and security patches. For example in year 2014 a serious security hole Heart Bleed discovered in OpenSSL versions and affected OpenSSL libraries are defined as versions.Following versions was vulnerable to...
by İsmail Baydan · Published 17/08/2017
OpenSSL provides different features about security and certificates. Public and Private Key cryptography also supported by OpenSSL. Websites, Firewalls and other applications uses Certificates in order to encrypt their network traffic or authenticate each other. In this tutorial we will look how to create Certificate Signing Request. Generate RSA Key...
