jrsec Projects

It is important that an organization can trust its secure sensitive data and systems have not been altered. Security teams must plan to check and verify file integrity. To quickly verify file integrity, they can validate a cryptographic checksum, in which they run a hash algorithm against the sensitive file.... [ 46-minute read ]

A shift cipher is a primitive version of a substitution cipher. A substitution cipher uses a translation map for characters. Each character in the text gets translated into another character. The substitution could be into letters, or into numbers or symbols. The result may be visually unreadable, but still very... [ 75-minute read ]

Windows PowerShell is a powerful command-line shell and scripting language tool for automating tasks and simplifying configuration. It can be used to automate almost any task in the Windows ecosystem, including Active Directory and Microsoft Exchange. [ 28-minute read ]

Tcpdump is a powerful yet simple network sniffer that displays traffic from your Ethernet adapter. Basic filtering can be applied to limit the traffic displayed or recorded to a file to only specific IP addresses, networks, TCP/UDP ports, or ICMP packets. [ 31-minute read ]

One of the first things a hacker wants to find out is what computing devices are running on a network. This is the beginning of the process of selecting a target for attack. The term footprinting means determining a network’s layout. [ 29-minute read ]