From viruses to digital signature
		Menaces
			Virus and worm
			Troian horses
			Spamming
			Spyware
			Phishing
		Safety requirements
		Cryptography
			Symmetric cryptography
			Asymetric cryptography
				The authentication
				Secrecy
				Key distribution
			Lenght of keys
		Net Security
			Techniques
				Security protocols
					SSL
				Firewall
				VPN
			Net dangers
				Packet sniffing
				Address spoofing
				DOS (Denial of Service)
		Digital signature