UCA Nana
One shortcut freezes keyboard and mouse - even ones plugged in later. Your film keeps playing, your dashboard keeps updating. Anyone who touches it gets a shaking screen and a “Na na naaa”.
Windows 10 and 11 · no install needed · one file
Windows' lock screen hides everything. UCA Nana hides nothing: it just stops every key and click until you say so.
Default Ctrl + Alt + N - or any combination you record. A hologram appears at the top, scans, and settles into a corner.
Videos, calls, builds, dashboards keep running. Keyboard, mouse, touchpad and any device plugged in now are frozen.
Press the shortcut again, put your USB key in, or type your PIN and press Enter. A small chime - and you are back.
A key, a click or a push of the mouse shakes the whole screen, glows the edges and shows your message. Never more than once in 0.7 s - no strobe.
“Na na naaa”, “Nope.”, “Cat detected” - or write your own message and pick your emoji. Add an away note like “Back in 10 min”.
A small living badge: turning rings, a scan line, a breathing core. Ember, cyan, violet or lime; any corner; any size.
Turn any stick into a key. In: unlocked. Pull it out and walk away: the PC freezes behind you.
Type it on the frozen screen and press Enter. Five wrong tries and it waits, longer each time.
Every try is counted. When you are back: “7 tries - 5 on the keyboard, 2 with the mouse, first at 14:02”.
Freeze by itself after you are idle. Or unfreeze by itself after 20 minutes - a film for the kids, a cat on the keyboard.
The pointer may still move to point at things - clicks and keys stay frozen.
The shortcut only locks; out only with the PIN or the USB key. The settings are behind the PIN too.
UCA Nana makes a signing key pair (ECDSA P-256). The private half goes onto the stick, your PC keeps only the public half. To unlock, the stick must sign a fresh random challenge - every time.
The key knows the stick it was made on. A copy of the file on another stick does not open anything. Lost it? Remove it in the settings with your PIN.
A key is only made after your PIN and your shortcut - so nobody can make one while you are away.
Stick gone? The shortcut and the PIN still work. And Ctrl + Alt + Del always works - Windows never lets any app block it, so nobody is ever locked out for good.
Corner, size, how much the screen dims (default: not at all), sounds, “Reduce flashing”.
No - it is for the moments when you want the screen to stay visible and running: a video, a presentation, a long build, a dashboard on a wall, kids or pets nearby. For real security when you leave, use Windows + L as well.
No, on purpose. Windows reserves it, so there is always a safe way out. After it, UCA Nana is still frozen.
It is frozen too. UCA Nana stops input at the system level, whatever device it comes from.
No. Your PIN is stored only as a strong hash on your PC, the USB key only on the stick. The app only asks nana.ucagg.de whether a newer version exists.
No. It runs as you and starts with Windows if you want.