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UID:pretalx-pts2026-9VXT39@cfp.pass-the-salt.org
DTSTART;TZID=CET:20260702T151000
DTEND;TZID=CET:20260702T154500
DESCRIPTION:**Shamir's Secret Sharing (SSS)** has been trusted for decades 
 by organizations like ICANN (DNSSEC root key ceremonies)\, Trezor (SLIP-39
 )\, and Coinbase \; yet it remains largely inaccessible to individual prac
 titioners and small teams who need cold storage for cryptocurrency wallets
 \, SSH keys\, infra recovery keys\, or root CA credentials.\n\nThis talk i
 ntroduces **Fractum**\, an open-source (MIT) CLI tool that combines AES-25
 6-GCM authenticated encryption with Shamir's Secret Sharing over GF(2^8) t
 o split sensitive files into K-of-N threshold shares. Designed as an air-g
 apped\, portable & offline-first tool with zero network dependencies\, Thi
 s tool brings information-theoretic security to anyone with a terminal.\n\
 nI will walk through the cryptographic design decisions: why GCM over CBC\
 , how polynomial interpolation in GF(256) actually works at the byte level
 \, how we handle entropy collection from multiple sources\, and the trade-
 offs of implementing memory protection (SecureString with mlock and multi-
 pass overwrite) in a garbage-collected language like Python. A pre-recorde
 d demo will show a full encrypt-split-distribute-reconstruct cycle running
  inside a network-isolated Docker container.\n\n**Attendees will take away
 **: a clear mental model of how threshold cryptography works in practice\,
  an understanding of the security properties (and honest limitations) of i
 mplementing SSS in Python\, and a free tool they can use immediately for t
 heir own cold storage needs.\n\nGitHub: https://github.com/katvio/fractum
DTSTAMP:20260514T103035Z
LOCATION:Amphitheater 122
SUMMARY:Fractum: an open-source CLI for Threshold-Based Cold Storage of Cri
 tical Secrets - Cédric - Katvio.com
URL:https://cfp.pass-the-salt.org/pts2026/talk/9VXT39/
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