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Bruce Schneier

schneier.com

In both a 2021 essay and my 2022 book, A Hacker’s Mind , I talk about AIs finding vulnerabilities and exploits—hacking—the legal system.

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Visit schneier.com → RSS feedOn Hacker News Jul 2008 – Sep 2026

Security & Privacy 152Society, Policy & Culture 88Crypto & Blockchain 10Life, Learning & Writing 9Tools & Productivity 8Math & Algorithms 7

121

Schneier: The Value of Privacy

Last week, revelation of yet another NSA surveillance effort against the American people has rekindled the privacy debate. Those in favor of these programs have trotted out the same rhetorical question we hear every time privacy advocates oppose ID checks, video cameras, massive databases, data mining, and other…

122

1971 Social Engineering Attack

From Betty Medsger’s book on the 1971 FBI burglary (page 22): As burglars, they used some unusual techniques, ones Davidon enjoyed recalling years later, such as what some of them did in 1970 at a draft board office in Delaware. During their casing, they had noticed that the interior door that opened to the draft…

123

The Most Incompetent TSA Story Yet?

The storyline: TSA screener finds two pipes in passenger’s bags. Screener determines that they’re not a threat. Screener confiscates them anyway, because of their “material and appearance.” Because they’re not actually a threat, screener leaves them at the checkpoint. Everyone forgets about them. Six hours later, the…

124

Nice Security Mindset Example

A real-world one-way function: Alice and Bob procure the same edition of the white pages book for a particular town, say Cambridge. For each letter Alice wants to encrypt, she finds a person in the book whose last name starts with this letter and uses his/her phone number as the encryption of that letter. To decrypt…

125

Reassessing Airport Security

News that the Transportation Security Administration missed a whopping 95% of guns and bombs in recent airport security “red team” tests was justifiably shocking. It’s clear that we’re not getting value for the $7 billion we’re paying the TSA annually. But there’s another conclusion, inescapable and disturbing to…

127

NSA E-Mail Eavesdropping

More Snowden documents analyzed by the Guardian—two articles—discuss how the NSA collected e-mails and data on Internet activity of both Americans and foreigners. The program might have ended in 2011, or it might have continued under a different name. This is the program that resulted in that bizarre tale of Bush…

128

American Elections Will Be Hacked

It’s over. The voting went smoothly. As of the time of writing, there are no serious fraud allegations, nor credible evidence that anyone tampered with voting rolls or voting machines. And most important, the results are not in doubt. While we may breathe a collective sigh of relief about that, we can’t ignore the…

130

Security and Privacy Implications of Zoom

Over the past few weeks, Zoom’s use has exploded since it became the video conferencing platform of choice in today’s COVID-19 world. (My own university, Harvard, uses it for all of its classes. Boris Johnson had a cabinet meeting over Zoom.) Over that same period, the company has been exposed for having both lousy…

131

WhatsApp Security Vulnerability

Back in March, Rolf Weber wrote about a potential vulnerability in the WhatsApp protocol that would allow Facebook to defeat perfect forward secrecy by forcibly change users’ keys, allowing it—or more likely, the government—to eavesdrop on encrypted messages. It seems that this vulnerability is real: WhatsApp has the…

132

Changing Passwords

How often should you change your password? I get asked that question a lot, usually by people annoyed at their employer’s or bank’s password expiration policy: people who finally memorized their current password and are realizing they’ll have to write down their new password. How could that possibly be more secure…

133

Intercepting Predator Video

Sometimes mediocre encryption is better than strong encryption, and sometimes no encryption is better still. The Wall Street Journal reported this week that Iraqi, and possibly also Afghan, militants are using commercial software to eavesdrop on U.S. Predators, other unmanned aerial vehicles, or UAVs, and even piloted…

136

Schneier on UAE to Ban BlackBerrys

The United Arab Emirates—Dubai, etc.—is threatening to ban BlackBerrys because they can’t eavesdrop on them. At the heart of the battle is access to the data transmitted by BlackBerrys. RIM processes the information through a handful of secure Network Operations Centers around the world, meaning that most governments…

137

Schneier on Filming the Police

In at least three U.S. states, it is illegal to film an active duty policeman: The legal justification for arresting the “shooter” rests on existing wiretapping or eavesdropping laws, with statutes against obstructing law enforcement sometimes cited. Illinois, Massachusetts, and Maryland are among the 12 states in…

140

Corrupted Word Files for Sale

On one hand, this is clever: We offer a wide array of corrupted Word files that are guaranteed not to open on a Mac or PC. A corrupted file is a file that contains scrambled and unrecoverable data due to hardware or software failure. Files may become corrupted when something goes wrong while a file is being saved e.g…

141

Virtual Mafia in Online Worlds

If you allow players in an online world to penalize each other, you open the door to extortion: One of the features that supported user socialization in the game was the ability to declare that another user was a trusted friend. The feature involved a graphical display that showed the faces of users who had declared…

142

Schneier reviews: Here Comes Everybody

In 1937, Ronald Coase answered one of the most perplexing questions in economics: if markets are so great, why do organizations exist? Why don’t people just buy and sell their own services in a market instead? Coase, who won the 1991 Nobel Prize in Economics, answered the question by noting a market’s transaction…

144

Countering "Trusting Trust"

Way back in 1974, Paul Karger and Roger Schell discovered a devastating attack against computer systems. Ken Thompson described it in his classic 1984 speech, “Reflections on Trusting Trust.” Basically, an attacker changes a compiler binary to produce malicious versions of some programs, INCLUDING ITSELF. Once this is…

146

SHA-1 Broken

SHA-1 has been broken. Not a reduced-round version. Not a simplified version. The real thing. The research team of Xiaoyun Wang, Yiqun Lisa Yin, and Hongbo Yu (mostly from Shandong University in China) have been quietly circulating a paper describing their results: collisions in the the full SHA-1 in 2**69 hash…

147

The Doghouse: Crypteto

Crypteto has a 49,152-bit symmetric key: The most important issue of any encryption product is the ‘bit key strength’. To date the strongest known algorithm has a 448-bit key. Crypteto now offers a 49,152-bit key. This means that for every extra 1 bit increase that Crypteto has over its competition makes it 100%…

148

The Security Mindset

Uncle Milton Industries has been selling ant farms to children since 1956. Some years ago, I remember opening one up with a friend. There were no actual ants included in the box. Instead, there was a card that you filled in with your address, and the company would mail you some ants. My friend expressed surprise that…

149

"Schneier's Law"

Back in 1998, I wrote: Anyone, from the most clueless amateur to the best cryptographer, can create an algorithm that he himself can’t break. In 2004, Cory Doctorow called this Schneier’s law: …what I think of as Schneier’s Law: “any person can invent a security system so clever that she or he can’t think of how to…

150

Random Number Bug in Debian Linux

This is a big deal: On May 13th, 2008 the Debian project announced that Luciano Bello found an interesting vulnerability in the OpenSSL package they were distributing. The bug in question was caused by the removal of the following line of code from md_rand.c MD_Update(&m,buf,j); [ .. ] MD_Update(&m,buf,j); /* purify…