CyberChef
The Cyber Swiss Army Knife - a web app for encryption, encoding, compression and data analysis. Built and maintained by GCHQ (The UK intelligence and security organisation).
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Snort is the foremost Open Source Intrusion Prevention System (IPS) in the world. Snort IPS uses a series of rules that help define malicious network activity and uses those rules to find packets that match against them and generates alerts for users.
