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Deepfake scams, the new face of online fraud

Deepfake scams, the new face of online fraud

2024-07-21

Scammers are using AI not just to clone voices, but also to replicate faces. Deepfake videos are media manipulated by AI, to show a person saying or doing something that they didn’t do. Initially used to clone celebrities, this technology is now widely accessible, making it easier than ever to impersonate just about anyone.

Olga Loiek, a Ukrainian YouTuber, was shocked to discover that her likeness had been stolen. Ironically, her face was being used online to sell Russian products.

Olga Loiek
Victim
She has my voice, my face, and she speaks fluent Mandarin. I’m terrified to realize that there’s not one, but an army of my clones. I’ve seen them before, how they impersonate celebrities and political figures. But I never expected to see myself.

When it comes to deepfakes, the most advanced technology allows for instant face-swapping. A deepfake can be created in real-time, during a video call. On this screen, the first frame shows a person’s actual face. The second frame shows green dots tracking his facial features. The third shows the deepfake video.

Hsu Chih-chung
National Cheng Kung University data science professor
With the passage of time, people are discovering how to collect better-quality samples. At the same time, modeling technology – AI technology – is also improving. As the quality of deepfake generation improves, interesting applications like face swapping are achieving more realistic results.

In the hands of scammers, AI can be used to create convincing deepfakes in live video calls.

Chao Yun
Criminal Investigation Bureau personnel
What you can do is ask them to turn their head, or to wave their hand in front of their face. When they’re waving, you might see some disruptions to the deepfake video.

Hsu Chih-chung
National Cheng Kung University data science professor
But the key variable is speed. If they move their hand quickly, you might not be able to detect changes in the image. So they need to wave their hand a bit slower. When they turn their head, they need to do it quickly. If they turn too slowly, the flaws can be quite hard to detect. When they move their head, they need to do it to the left, right, up, and down, all at the same speed. It’s only when the speed is consistent that you can detect artifacts. Covering the face, either with a hand or an object, can also reveal flaws. For example, you can see part of the hand disappear.

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深偽影片 如何破解?

2024-07-21

AI科技運用在犯罪,除了聲音,還有換臉的深偽影片。深偽影片一開始多用於名人,在科技日趨成熟與普及,製作虛假影片的門檻也降低,這意味著大眾受害風險也增加了。

烏克蘭的網紅Olga在網友告知下,發現自己居然被盜臉,諷刺的是,還是用於銷售敵國俄羅斯的商品。

[[深偽受害者 Olga Loiek]]
“她有我的聲音、我的臉,還說一口流利中文,我很震驚的發現,不只一個在網路有一群我的複製人,我看過深偽影片,都是模仿名人或政治人物,沒想過會發生在我身上。”

以深偽來說,目前較先進的技術是即時換臉,也就是能一邊視訊 一邊同步深偽。像畫面第一格是正常的臉,第二格綠點是抓他的五官位置,第三格是要換上的臉。

[[成大數據科學研究所副教授 許志仲]]
“隨著時間發展,大家比較逐漸意識到說,我知道怎麼收集品質才會好,然後模型的技術,AI的技術也一直發展,生成品質越來越好,所以當然它對於換臉的有趣應用,也變得更生動。”

若這些科技被用在詐騙上,到時視訊另一端的人,是不是這張臉、是不是這聲音,難辨真假。

[[刑事局預防科偵查員 趙雲]]
“你可以請他做轉頭的動作,或是說讓他的手在臉前揮一下,在揮的過程之中,可能在AI深偽的技術,它在轉換的過程之中,就會產生一些不連貫,或是破碎的狀況發生。”

[[成大數據科學研究所副教授 許志仲]]
“但一切的關鍵是在於說速度,你的速度如果,比方說手很快的話,你可能看不出來它有變化,所以你手遮蔽的時間,要久一點,要慢一點,轉頭則是要快一點。如果你慢慢轉,其實看不太出來,所以速度上下左右都一樣,速度快才會產生假影的狀況。另外遮蔽的話,不管用手還是任何物品遮蔽,你可以看得到,被遮蔽的手會不見的現象。”

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