BARCELONA—I’ve been using my face to open doors for me.

On Monday, I walked into a conference center and, instead of flashing a badge with my name and photo, I positioned myself in front of a head-height camera the size of my fist. Seconds later, the screen read: “PLEASE ENTER.”

No one scanned the digital pass on my phone for me to get into this year’s MWC, the annual tech trade show formerly known as Mobile World Congress. Facial-recognition software did all the work.

Your visage, too, might already be an entry ticket at a venue near you. Delta Air Lines Inc., United Airlines Holdings Inc. and JetBlue Airways Corp. have ticketless face-scanning boarding systems installed at several airports. 

This season, all Mets fans can use facial-recognition express lanes previously reserved for season-ticket holders. Creepy? Cool? Based on my recent brush with the tech, it’s both.

As facial-recognition access points crop up in more public places including airports and concert venues, you might be wondering how you’re supposed to feel about it.

Companies implementing face-matching software tout speed, convenience, security and contactless benefits for customers. Most also stress that it’s only an option. Meanwhile, lawmakers in several U.S. states are looking to tighten regulations around use of this kind of tech, citing privacy concerns as well as allegations of bias. Research has found that the tech isn’t as accurate for people of color and women, in general.

While the answer comes down to the individual, it helps if you know the company providing the service and the expected benefits: Do you want this firm storing your biometric information? Are you getting something useful in return? It also depends on where you are, since local laws affect the extent to which facial recognition can be used and data can be collected.

Facial recognition works by creating a map of your face. The map contains your unique measurements—the distance between your forehead and chin, or between your eyes. These stats are then converted into code called a biometric token or faceprint.

It’s how your iPhone’s Face ID identifies you, how Google Photos can group shots of your kids or how Amazon.com Inc.’s Astro robot can tell family members from burglars. The tokens aren’t shared between distinct services—each uses its own unique, nontransferable token for you.

GSMA, the industry group that organizes MWC and represents mobile-network operators worldwide, used a facial-recognition service called Breez, developed with ScanVis Ltd., a Hong Kong-based company. The service cross references attendees’ faces with previously submitted photos from government-issued IDs. Breez entry is optional, but I chose it for the speed. Ahead of the event, non-Breez attendees could wait several days to confirm their registration. Signing up with the MWC app—which used my phone’s camera to match my face with the image on my passport—took less than a minute.

While the conference’s face-scanning lanes were certainly convenient, each time I stared into the camera, I wondered who was looking back at me. Where does my image go and what can be done with it?

A company that stores your face data could keep it and pivot from venue admission to, say, law enforcement, or be acquired by a company that has an entirely different purpose than what you agreed to. This kind of misuse is largely hypothetical. However, you can’t always track where your face ends up: One company sold facial-recognition tech based on billions of images scraped from Facebook, LinkedIn and other sources.

Before consenting to use of biometric data, Josef Kittler, a professor of machine intelligence at the University of Surrey in the U.K., recommends finding out three things: the purpose of collecting your data, what happens to your face image once you no longer need the service, and how the data is deleted.

The conference’s organizers said attendees’ biometric tokens are encrypted and stored in Europe, though the data can be accessed from Hong Kong. The event’s privacy policy said the data is “securely destroyed” within 28 days of the event in accordance with the European Union’s data-privacy laws. A spokesman for GSMA told me the data will likely be deleted within three days of the event closing. ScanVis, GSMA’s tech partner, didn’t respond to my request for comment.

While you almost always have the ability to opt out of facial recognition, it could eventually come at a cost, said Jennifer King, a privacy and data-policy fellow at Stanford’s Institute for Human-Centered Artificial Intelligence. Think of how the cash lane at a toll stop is almost always far slower than the E-ZPass lanes.

Another issue, she said, is that the U.S. doesn’t have a federal law governing opt-out and nondiscrimination rights, the way the EU does. Not only are there laws in Europe, but there are also regulators empowered to enforce them, said Dr. King. Currently, only a smattering of states, including Illinois, Texas and California, have biometric-privacy rules.

In January, the New York attorney general launched a review into Madison Square Garden Entertainment Corp., after the New York City venue used facial recognition to prevent attorneys from firms suing the company from attending concerts or sporting events. In late February, a pair of court rulings expanded the scope of an Illinois law governing companies’ use of biometric data, which includes face and retinal scans.

Face scanning will only become more prevalent in our travels and entertainment, as well as other areas such as education, banking and law enforcement. We’ve just begun to understand the pros and cons.

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1.How did the author enter the conference center at MWC?

A By showing a badge with their name and photo.

B By scanning a digital pass on their phone.

C By using facial recognition software.

D By providing a fingerprint.

解析：选C。C 由第2段可知，作者描述了将自己定位在头部高度的摄像头前，面部识别软件允许他们进入会议中心。故选C。

2.Which airlines have installed ticketless face-scanning boarding systems at several airports?

A Delta Air Lines, United Airlines, and JetBlue Airways.

B American Airlines, Southwest Airlines, and Alaska Airlines.

C British Airways, Lufthansa, and Air France.

D Emirates, Qatar Airways, and Singapore Airlines.

解析：选A。A 由第4段可知，达美航空公司、联合航空公司和捷蓝航空公司在几个机场安装了无票人脸扫描登机系统。故选A。

3.What are some concerns regarding facial recognition technology?

A Privacy concerns and allegations of bias.

B High cost and limited availability.

C Slow processing and wait times.

D Limited applications and compatibility.

解析：选A。A 由第7段可知，美国几个州的立法者以隐私问题和偏见指控为由，希望加强对面部识别技术使用的监管。故选A。

4.How is the facial recognition data (biometric token) created?

A By measuring the size of your face.

B By analyzing the color and texture of your skin.

C By creating a map of your face and converting it into a biometric token.

D By comparing your face to a database of known faces.

解析：选C。C 由第9段可知，面部识别的工作原理是创建一个人的面部地图，并将唯一的测量值转换为生物特征标记。故选C。

5.What recommendations does Josef Kittler give before consenting to the use of biometric data?

A Determine the purpose of data collection, what happens to your face image once the service is no longer needed, and how the data is deleted.

B Assess the cost, potential benefits, and whether the technology is widely accepted.

C Investigate the company's reputation, data storage policies, and potential risks.

D Understand the technology's accuracy, limitations, and potential for misuse.

解析：选A。A 由第14段可知，Josef Kittler建议在同意使用生物特征数据之前先弄清楚三件事：收集数据的目的，一旦你不再需要该服务，你的面部图像会发生什么，以及如何删除数据。故选A。