Air-gapped file encryption as self-decrypting HTML page

Details

External ID

49827375

Source

HN

Company

—

Product

Air-gapped file encryption as self-decrypting HTML page

Website domain

apeleg.com

Launched

Sept. 24, 2026

Cohort

—

Upvotes

90

Upvotes percentile

0.9130781499202552

Tags

—

Fetched at

Sept. 28, 2026, 5:01 p.m.

Updated at

Sept. 28, 2026, 5:01 p.m.

Description

Air-gapped file encryption packed into a single, self-decrypting HTML page. Repo: https://github.com/ApelegHQ/ts-cms-ep-sfxI was inspired by self-extracting archives. I wanted to share files with basically no dependencies. The goal was: 1. Something that didn't require any installation (assuming a web browser) 2. Have a single file with no network that could self-decrypt 3. Be fully auditable The second point is done by having (sort of(*)) reproducible builds and embedded OpenPGP signatures.The first point is made by cleverly manipulating the HTML structure so that it can decrypt without breaking the PGP signature. It can even decrypt using bare openssl (which was a design goal too, though getting the exact structure right took some work and bug reports).The third point is accomplished by the first two, and by the source being freely available.(*) Depends on the OS at the moment.

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