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Design Flaw: Per-Byte Shamir Splitting of BIP-39 Mnemonics Causes Entropy Collapse and Non-Unique Reconstruction

Status: Open.

#65 In bitaps-com/pybtc;

· Petah0411 opened on Dec 13, 2025

*Title*: <code>Exploring Shamir (3-of-5) with 2 Shares - ZeroNights X Bounty</code> - *Body*: Hi @bitaps-com team, exploring PyBTC for the ZeroNights X bounty. Given 2/3 shares: - Share 1: <code>session cigar grape merry useful churn fatal thought very any arm unaware</code> - Share 2: <code>clock fresh security field caution effort gorilla speed plastic common tomato echo</code> Tested <code>recover_secret</code>, no critical flaws yet. Suggestions: sanitize logs, test edge cases, document partial-share handling. Goal: break the scheme (1 BTC prize). @ MSMcloud9bm *Labels (optional)*: <code>bug bounty</code>, <code>security</code>, <code>enhancement</code>

Status: Open.

#64 In bitaps-com/pybtc;

· BTRMMD opened on Dec 7, 2025

Coefficient-Correlation Weakness in pybtc-legacy Shamir Implementation

Status: Open.

#63 In bitaps-com/pybtc;

· bakaxbaka opened on Nov 30, 2025

ritical Shamir's Secret Sharing Coefficient Generation Vulnerability - Entropy Reduction Attack

Status: Open.

#61 In bitaps-com/pybtc;

· typosBtc87 opened on Oct 17, 2025

Security Report — Bitaps pybtc Shamir Secret Sharing (SSS) Issue

Status: Open.

#60 In bitaps-com/pybtc;

· Nyx38 opened on Oct 16, 2025

Threshold Bypass in Shamir Secret Backup Scheme: Full Mnemonic Recovery With Only 2 Shares (Intended 3-of-5)

Status: Open.

#59 In bitaps-com/pybtc;

· joseHbernardino opened on Sep 22, 2025

Evaluator uses indexOf(a) instead of loop index

Status: Open.

#58 In bitaps-com/pybtc;

· angus14 opened on Aug 29, 2025

Shamir SSSS: enforce non-zero leading coefficient &amp; require CSPRNG (prevents 2-share byte leaks)

Status: Open.

#57 In bitaps-com/pybtc;

· angus14 opened on Aug 19, 2025

[BUG] Static Share Index Predictability Weakens Shamir SSS Security (Potential Brute-force)

Status: Open.

#55 In bitaps-com/pybtc;

· Shanto5830 opened on Jul 8, 2025

Recursive Share Mutation Induces Entropy Drift Beyond Threshold In Shamir Scheme

Status: Open.

#54 In bitaps-com/pybtc;

· Yatishs03 opened on Jul 4, 2025

1 BTC Bug: 2 Share Recovery via deterministic x-values in Shamir Scheme

Status: Open.

#53 In bitaps-com/pybtc;

· Yatishs03 opened on Jul 4, 2025

[Security] Weak randomness in shamir.py allows coefficient prediction

Status: Open.

#52 In bitaps-com/pybtc;

· raminrezaei opened on Jun 29, 2025