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Stop using the same login credentials everywhere. The top password managers we've tested create a unique and strong password for each of your online accounts and alert you to potential data leaks. I ...

Here's your chance to crack ciphers similar to those Bletchley Park's codebreakers faced during World War II. Below, we present three ciphers of different levels of difficulty, from easiest to most ...

On a foggy Saturday morning in 1953, a tall, skinny 24-year-old man fiddled with shapes he had cut out of cardboard. They represented fragments of a DNA molecule, and young James Watson was trying to ...

Containers move fast. They're created and removed in seconds, but the vulnerabilities they introduce can stick around. Learn 5 core practices to help engineering and security teams manage container ...

Select the cell. Go to Format | Cells | Protection Tab. Deselect Locked. If an exclamation point appears, click on and choose Help On This Error to read Excel's warning.