Hundreds of recent victims have been underage students, according to cyber experts.
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Attackers are using free online artificial intelligence (AI) tools to turn photos and videos posted on social media into fake porn videos.
Though a global phenomenon, cases are currently surging in Greece.
Euronews correspondent Symela Touchtidou spoke to cybersecurity experts in Athens about their findings from investigations into how AI is being used to make fake sex videos.
"AI has made it easy for the villains," Manolis Sfakianakis, founder of the Cybersecurity Institute, told Euronews.
"They find the AI tools that are very easy to use; they do not need sophisticated training. They take your photos, they take your face and place it into an erotic video. They distribute the video on various platforms.
"Their goal is to take revenge, ransom or just have fun".
Privacy breach cases have tripled in Greece over the last decade with the Greek government preparing a new law to combat the rise of deepfakes and offline them as quickly as possible.
Watch the full report in the player above to find out more.
