ROT13
A Caesar shift of thirteen, which is its own inverse — encoding twice returns the original.
This is not encryption. One possible key, published. This hides text from a glance, not from a person.
What it is made of
- Is this encryption?
- No. It hides text from a glance, not from a person.
- Possible keys
- 1
- Broken since
- antiquity
- Runs in
- Your browser and the server
What it is
A Caesar shift of thirteen, which is its own inverse — encoding twice returns the original.
Where it runs
Both lanes. By default the lab runs it in your own browser over the Web Crypto API, so nothing leaves your device — there is no upload, no size limit and no queue. The server lane is there when you want it, and it is the only way an agent or a script can reach the same engine.
Why a real encryption tool ships a broken cipher
Because this is the only kind of cipher you can run by hand, and doing that once is what makes "key" and "keyspace" mean anything. You cannot save an encrypted file with it here — the lab will not write a container claiming to protect something that anyone can read. What it will do is break the Caesar one in front of you, with no key, and show you all twenty-five wrong answers beside the right one.
Try it
Open the Classical bench in the lab and type into it. Then hand the result to the breaker and watch it come apart without a key. The lab is a Leumas membership away; everything on this page is free.