QR Code Utility
Generate QR codes from any text or URL, and decode QR codes by uploading or pasting an image.
Open tool →JWT Decoder & Encoder
Decode, inspect, and re-sign JSON Web Tokens. Edit header and payload, switch algorithms, and generate HS256 signatures.
Open tool →OAuth2 / OIDC
Build and send OAuth2 / OpenID Connect authorization requests. Supports PKCE, nonce, and state. Exchange authorization codes for tokens.
Open tool →IK Generator
Generate a valid German Institutionskennzeichen (IK) number with correct Luhn checksum, starting with prefix 3001.
Open tool →Group Assignment
Randomly assign training participants into groups. Drag and drop to adjust, reset assignments or everything. State is persisted across sessions.
Punycode Encoder & Decoder
Convert internationalized domain names (IDN) between Unicode and their ASCII-compatible Punycode representation. Detect homograph phishing domains.
Open tool →TOTP Generator
Generate current, previous, and next TOTP codes from an otpauth URI. Includes a countdown timer and code history table.
Open tool →oose Trainingsübersicht
Overview of oose training courses and seminars with scheduling and availability information.
Open tool →Certificate Decoder
Paste or drop a certificate, chain, CSR or CRL in any common format — PEM, DER, PKCS#7, PKCS#12 — and read it as openssl would print it.
Open tool →Timer
Countdown of up to an hour on a clock face: click the minutes to start, watch the red slice shrink, pause, and add a minute on the fly.
Open tool →API Key Vault
Store AI API keys encrypted on the server and let the training VMs fetch them over an authenticated request. Write-only, with an audit log of every access.
Open tool →Certificate Generator
Issue fresh Let’s Encrypt certificates for the training VM domains via DNS challenge, and rebuild the bundle the VMs fetch at boot.
Open tool →Quick Paste
Post a snippet to a shared board and copy it back verbatim on another machine. Keeps the newest 20 pastes, updates live without reloading.
Open tool →Claude Vulnerability Scoring Service
Score vulnerabilities with CVSS v4.0 and v3.1 — click, paste a vector, or let the AI assistant score a description with you. Share as links, or use the JSON API.
Open tool →PSI-Autoresponder
Paste a templated vulnerability report and send the standard “incomplete / invalid” reply, with the report quoted, from an Atomic Mail inbox. Sign-in required.
Open tool →Sequence Diagrams
Write sequence diagrams in sequencediagram.org syntax or draw them with the mouse — and edit them together, live, via a shared secret link. Export as SVG or PNG.
Open tool →