BL303 — Submission Integrity Decoder

⚠ Open this file in Firefox for accurate results.
Your current browser blocks the SHA-256 API on local file:// pages (Chrome/Edge/Safari). Hash verification will produce false “tampered” verdicts on genuine submissions. Simply re-open decoder.html in Firefox.

Load one submission

📄 Click to choose a .txt file or drag & drop it here

File is read locally — nothing is uploaded anywhere.

— or paste the file contents below —

Select the entire Lamda download folder

📁 Click to choose the Lamda submissions folder

Select the top-level folder (e.g. 863719401-…-assignsubmission).
The browser will read all files inside all student subfolders automatically.
Nothing leaves your computer.

Processing…

0 submissions ⚠️ 0 Tampered ❓ 0 Unsigned ✅ 0 Authentic

Lamda Name	Submitted As	Verdict	Time on Page	⚠ Flags	File

Student Info

Name (form field)—

Lamda folder name—

Course / Exercise—

Signature version—

JS disabled mid-session—

Session Timing

Page opened —

Download clicked —

Total time on page—

Time-on-page indicator (max scale = 60 min)

Hash Verification (Tamper Detection)

Hash embedded at download time (original)

—

Hash of this file’s visible content (current)

—

Per-Field Activity Log

Field	Chars typed	Chars in file	First keystroke	Last keystroke