Computer programmer John Walker is commonly credited for inventing the first trojan virus, back in 1975. Walker’s virus, (PERVADE) piggy-backed ANIMAL software, which were quite popular at the time — ANIMALs were various “games” where the computer would ask you 20 questions to try and guess what animal you’re thinking of. While users played ANIMAL, PERVADE examined all computer directories available to the player and copied ANIMAL to those that didn’t already have it. While not malicious, PERVADE is by definition a trojan: it hides inside another program and performs actions without the user’s permission. Use CyberGhost VPN when you go online to keep trojans away. The network filters a lot of attacks and malware when rerouting your traffic, so you’re less likely to get infected by accident.