Question 1

What is ROT13?

Accepted Answer

ROT13 is a special case of the Caesar cipher where each letter is replaced by the letter 13 positions after it in the alphabet. It is its own inverse — applying ROT13 twice returns the original text.

Question 2

What is a Caesar cipher?

Accepted Answer

The Caesar cipher is one of the oldest known encryption techniques. It shifts each letter in the alphabet by a fixed number of positions. For example, with a shift of 3, A becomes D, B becomes E, and so on.

Question 3

Is this cipher secure?

Accepted Answer

No. Caesar cipher and ROT13 are simple substitution ciphers and provide no real security. They are great for puzzles, learning, hiding spoilers, and obscuring text — not for protecting sensitive information.

Question 4

Does it work with numbers and symbols?

Accepted Answer

Yes. You can enable the option to shift digits (0-9) and ASCII symbols along with letters, which gives you a more complete cipher for mixed text.