What a Chat App Can Be Forced to Hand Over

What a Chat App Can Be Forced to Hand Over

Same court order, sent to two apps. The answers couldn't be more different. One comes back as a thick file, and the other as two dates. What can most apps be made to hand over? Quite a lot more than the messages themselves. Who you talked to. When, and how often. Your contacts. The groups โ€ฆ

Why Deleting a Message Does Not Delete It

Why Deleting a Message Does Not Delete It

You hit delete on a message and felt a little better. That relief is mostly imaginary. The message left your screen, but it did not leave the world. What survives after I press delete? A backup still has a copy. Your chats back up to Google Drive or iCloud on a schedule. That copy was โ€ฆ

Encryption Hides What You Say, Not Who You Talk To

Encryption Hides What You Say, Not Who You Talk To

"It's encrypted, so I'm totally safe." Most of us have said some version of that line and relaxed. It is half true, and the missing half is the part worth understanding. What does encryption actually protect? Encryption scrambles your message so only the person at the other end can read it. End-to-end encryption means the โ€ฆ

That Friendly Find Friends Button Is Not About Friends

That Friendly Find Friends Button Is Not About Friends

You install a new app and the very first screen is warm and helpful. "Find Friends" it says, with a big button underneath: Allow Contacts. It feels like a small favour to yourself, so you tap it. What did I just hand over? Every name and number stored in your phone. Your relatives, your doctor, โ€ฆ

Your Address Book Belongs to Other People Too

Your Address Book Belongs to Other People Too

We think of privacy as a personal choice. My phone, my data, my decision. Then we tap "allow access to contacts". And quietly make that decision for everybody else in it. Whose data is in my address book? Not yours. Your mother's number is her number, not your property. Your accountant gave you his details โ€ฆ

3.5 Billion Accounts, and What Actually Leaked

3.5 Billion Accounts, and What Actually Leaked

Most of us have received that forward warning about a WhatsApp hack. Usually it is nonsense. This one was not, and the number is genuinely hard to take in. What was the number again? Roughly 3.5 billion accounts. That is not a typo, and it is not a subset. It is close to every WhatsApp โ€ฆ

Four Messages Can Tell Your Whole Story

Four Messages Can Tell Your Whole Story

"It's just who I messaged, not what I said." Almost everybody says this, and it sounds reasonable. Let me show you why it falls apart. What can four messages reveal? Picture two ordinary days on somebody's phone. Message one goes to a divorce lawyer. Message two goes to an apartment listing site. Message three goes โ€ฆ

Your Phone Learns From You Even When You Say Nothing

Your Phone Learns From You Even When You Say Nothing

We picture tracking as somebody reading what we write. So we watch our words, and feel careful. The truth is that your silence is just as readable. What can my habits give away? When you are online and when you are asleep. Which contacts get an instant reply and which wait until evening. Who you โ€ฆ

How a Call Log Can Reveal a Diagnosis

How a Call Log Can Reveal a Diagnosis

Think about a single morning of phone calls. Not the words in them, only the numbers dialled. That short list can say something you have not told a soul. What do four calls look like from outside? The first call goes to an oncology clinic. The second goes to your partner, and it is longer โ€ฆ

If an App Is Free, How Does It Make Money?

If an App Is Free, How Does It Make Money?

We download free apps without a second thought. Free feels like a gift, and gifts do not need examining. Then you notice the company behind it is worth billions. Something does not add up. What is the question I should be asking? Ask it every single time: how does this make money? Servers cost money, โ€ฆ