What does 2FA stand for?
AnswerTwo-factor authentication
2FA requires two kinds of proof, such as a password plus a code from your phone.
Coding · Facts & stats
Black Hat facts & stats
7 fact-checked facts about cybersecurity, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
What does a firewall do?
AnswerFilters network traffic based on security rules
A firewall allows or blocks traffic between networks according to set rules.
Going deeper
What is a DDoS attack?
AnswerFlooding a service with traffic from many machines to knock it offline
A distributed denial-of-service attack overwhelms a target using traffic from many sources.
How does the Caesar cipher encrypt text?
AnswerBy shifting each letter a fixed number of places
Julius Caesar reportedly used a shift of three, so A became D.
What is a 'zero-day' vulnerability?
AnswerA flaw unknown to the vendor, with no fix available yet
The name means developers have had zero days to fix the flaw.
Expert level
What is SQL injection?
AnswerInserting malicious database commands through user input
If input isn't handled safely, attackers can make a database run commands it shouldn't.
Why are cryptographic hash functions used to store passwords?
AnswerThey are easy to compute but practically impossible to reverse
Systems store the hash, then compare hashes at login, so the original password isn't kept.
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