What is Non-repudiation?

Non-repudiation means you can’t deny that you did something, it’s like leaving a fingerprint on a glass that everyone can see.

Imagine you and your friend are playing a game with marbles. You both agree to take turns rolling the marble into a cup, but when it's your turn, you roll the marble in without telling anyone. Later, your friend says, “I didn’t do that!” But if there’s a camera recording every move, you can't deny (that’s repudiation) you rolled the marble, because the camera shows you did it.

Think of non-repudiation like signing your name on a drawing. If you draw something and sign your name at the bottom, no one can say, “That wasn’t you!” because your signature proves you were there.

Sometimes, people use special tools, like a digital stamp, to make sure they can't deny doing something, just like how you might press your hand into clay to leave a print that everyone knows is yours. Non-repudiation means you can’t deny that you did something, it’s like leaving a fingerprint on a glass that everyone can see.

Imagine you and your friend are playing a game with marbles. You both agree to take turns rolling the marble into a cup, but when it's your turn, you roll the marble in without telling anyone. Later, your friend says, “I didn’t do that!” But if there’s a camera recording every move, you can't deny (that’s repudiation) you rolled the marble, because the camera shows you did it.