Hong Kong CNN  — 

On a humid Sunday night in Hong Kong’s financial district, hundreds of young people ready themselves for the latest protest.

Some wear flimsy medical masks and swimming goggles, others wear heavy-duty respirators and protective glasses. All are covering their faces to protect themselves not only from police tear gas – but also to obscure their identities.

Hong Kong’s pro-democracy activists are concerned about being identified by authorities and prosecuted. Since mass demonstrations kicked off in June, roughly 700 people have been arrested, many for unlawful assembly.

This weekend, demonstrators attempted to tear down or dismantle some of the city’s 50 newly-installed so-called “smart lamp posts” – which have cameras and sensors – in a protest against perceived government surveillance. The Hong Kong government said the lamp posts, which are intended to track data such as air quality and traffic flow, are not equipped with facial recognition software and “would not infringe upon personal privacy.”

But Hong Kong’s protesters aren’t the only ones worried about protecting their identities.

Activists, designers and artists around the world are inventing creative ways to avoid detection.

As state surveillance becomes more advanced – and widely used – wearable technology has been proposed as a way to thwart monitoring systems.

A protester wearing a mask during anti-government protests, which began in response to a proposed extradition law, in Tai Po, Hong Kong, on August 10, 2019.

Fighting technology with technology

After witnessing police brutality at protests in his native Brazil in 2013, United States-based designer Pedro Oliveira began researching how authorities around the world deploy technology against demonstrators.

In some countries, there were internet black outs. In others, widespread censorship.

Hoping to raise awareness about the tactics authorities were using against protesters, Oliveira and fellow designer Xuedi Chen created a slick-looking protest kit as part of their art and design project, Backslash.

It includes a “smart” bandana that serves to simultaneously conceal the wearer’s identity, while communicating messages between protesters through a computer-generated pattern that can only be read by a custom app.

A woman wears Backslash's smart bandana. According to the concept's designers, different messages can be unlocked depending on which way the bandana is folded.

The kit also features a wearable device that alerts fellow demonstrators to the presence of police, and a stencil that creates graffiti “tags” – readable only by an app – to inform protesters when an area is under surveillance.

But the kits are not for sale. Instead, Oliveira and Chen hoped to start a dialogue about what they see as an increasing power imbalance between authorities and demonstrators.

“We didn’t feel that these should be offered to protesters as a solution. We just thought it was important to research and have a conversation about the hyper-militarization of police and all this technology being used against protesters,” Oliveira said in a phone interview.

Backlash's survival kit for future protesters includes a router for localized communication during an internet blackout.

Advancements in facial recognition technology is of particular concern to demonstrators and privacy campaigners.

The technology, much of which is still in development, works by capturing images of people’s faces and matching biometric information – such as the distance between facial features – with existing photo ID databases.

In his project CV Dazzle, artist Adam Harvey proposes a number of inventive ways to evade surveillance technology, including face jewels and elaborate hairstyles. On his website, he claims that applying tonal gradients of make-up can create fake contours that obscure people’s features – a kind of “anti-face,” as he puts it – making it harder for facial recognition systems to collect the data needed to identify individuals.

He also recommends make-up be applied asymmetrically, in order to throw off facial-recognition algorithms.

Alternatively, London-based Zach Blas has invented “collective masks” using biometric data from multiple faces in his project “Facial Weaponization Suite.” The artist’s conceptual masks are a statement on the “inequalities these (biometric facial recognition) technologies propagate,” according to his website.

One of the masks addresses facial recognition software’s built-in prejudices towards skin color, a criticism that activists have raised before. Critics say that if software is trained using a disproportionate number of male and white faces, there could be an increased chance of women and people of color being misidentified.

Zach Blas' project "Facial Weaponization Suite" comprises of three different types of masks that he claims cannot be detected as human faces by facial recognition software.
Participants in a public art performance by Zach Blas in Mexico City.

The resulting disguises look like amorphous, colorful blobs that Blas claims can fool facial recognition technology – to the extent that wearers aren’t even identified as human.

But these unusual tactics can create problems of their own. As artist Leo Selvaggio points out: “Walking out with this make-up on your face … actually makes you conspicuous.”

Selvaggio believes that people have also been “weaponized” into being part of surveillance, meaning that someone would likely report anything out of the ordinary – like unusual make-up or a blob-like mask – to the authorities.

“(Anti-surveillance projects) don’t really take into account the human aspect of surveillance,” he added in a phone interview.

The artist has proposed another solution: prosthetic masks of his own face. Like Blas’ “collective” masks, they hide the wearer’s true identity. But unlike Blas’ disguises, they would be analyzed as a human face by surveillance systems, fooling authorities into thinking that one person is in multiple places at the same time.

Selvaggio has designed a 3D-printed prosthetic of his face.
A prosthetic mask created by artist Leo Selvaggio. Selvaggio also created a paper mask as an alternative for groups of activists and protesters.

Simple solutions in Hong Kong

On the streets of Hong Kong, protesters have opted for readily available solutions.

“People tend to experiment a lot in protest movements,” said Gavin Grindon, who curated a 2014 exhibition at the Victoria and Albert Museum in London on objects used in protests.

“It’s often the simple solution – the quick solution – that’s the elegant and effective one,” said Grindon.

When it comes to avoiding detection, many opt for a medical or gas mask paired with goggles to obscure their identities.

“We need to hide ourselves so if we get caught on camera, we’re safe,” said a 22-year-old volunteer first aider, who spoke on condition of anonymity, for security reasons.

She is concerned that if police spot her at the scene, they could pin a crime on her that she didn’t commit, or later identify her online, which could put her friends and family at risk.

Protesters point laser beams at policemen during a protest in Hong Kong, on August 11, 2019.

Young Hong Kong protesters also employ other tactics to cover their digital tracks, such as organizing themselves on encrypted app Telegram, using new SIM cards and single-journey subway tickets, rather than travel cards registered to their names, and adopting code names while talking to one another at demonstrations.

Umbrellas are also widely used to block security cameras, ward off tear gas and provide cover for those painting slogans on walls or unscrewing metal railings from the sidewalk. In recent weeks, protesters have strategically used laser pointers to blind security cameras and distract the police.

Laser beams shone by protesters light up the Sham Shui Po police station in Hong Kong on August 14, 2019.

The 22-year-old volunteer first aider said that these ideas form organically from online discussions.

Protesters offer each other advice, such as wearing identical outfits and taping over brands on their shoes, to blend in with one another. She’s also seen some put reflective tape on their goggles, taking a cue from the silver strips that Hong Kong riot police sometimes place on their protective visors.

A police spokesperson would not disclose why they did so, for operational reasons. But the material helps prevent observers from identifying the wearer, as their eyes are hidden from view. A post on online forum LIHKG, the city’s answer to Reddit, instructs protesters where to affix it to hide their identity.

A protester wears tape under goggles in an attempt to protect his identity during a demonstration on June 12, 2019, in Hong Kong.
Police stand guard outside Mong Kok police station as pro-democracy protesters gather on August 17, 2019 in Hong Kong.

The use of reflective materials to evade surveillance isn’t just being explored in Hong Kong. In 2016, American artist Scott Urban set up a Kickstarter page to crowdfund his anti-surveillance sunglasses, Reflectacles.

The eyewear is made from a material that reflects infrared light, meaning the frames appear as flashes of white light in surveillance footage. Because of the glare, a person could appear anonymous in images and photos, his website claims.

Urban said his website has experienced a spike in hits from Hong Kong, as a result of the recent protests.

“I’m not trying to hawk a product,” Urban said in a phone interview. “I’m just trying to tell people that when your face becomes your identity, there’s no going back. You’re going to be tracked constantly in any pu