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Low 35 Bitcoin

feat: update dice roll entropy ui

Public commit record

What the developer wrote

Authored by soralit

62/100 · Adequate
feat: update dice roll entropy ui
✓ Descriptive subject✓ Names a concrete action or component✓ Uses a recognizable type or scope✓ Names security-relevant behavior explicitly! No meaningful explanatory body
The short version

What changed, and why it matters

This commit updates the user interface and internal checks for generating wallet seed phrases using dice rolls as a source of randomness. It enforces a minimum number of dice rolls depending on the desired seed strength: at least 50 rolls for 12-word (BIP39) or 20-word (SLIP39) seeds, and at least 100 rolls for 24-word (BIP39) or 33-word (SLIP39) seeds. Previously, the firmware only required 50 rolls regardless of seed length. The change is a security hardening measure to ensure that higher-strength seeds receive enough physical entropy, but it is a partial patch because the dice-roll input itself is not fully validated and the entropy extraction method is not visible in this diff.

Recommended action

Review the dice-roll-to-entropy conversion function (not shown in this diff) to ensure it uses a constant-time, unbiased extraction such as SHA-256 over the full dice string, and that the resulting entropy is not truncated or reused. Consider adding input validation to reject characters outside the expected dice alphabet and to warn users about biased dice or repeated sequences. Verify that the fallback from 24/33 words to 12/20 words is clearly communicated so users do not unknowingly create a weaker seed than intended.

Security signals we found

01

Enforces minimum entropy input length based on target mnemonic strength

02

Adds server-side/model-layer validation in addition to UI gating

03

Prevents generation of 256-bit seeds from insufficient dice-roll entropy

04

Adds user-facing warnings and fallback word-count behavior

05

Does not validate the character set or distribution of dice-roll input

06

Does not show the hash/entropy reduction algorithm in the diff

Risk score

Why this scored 35/100

Our methodology →
Potential impact 8/30
Exploitability 5/25
Stealth signal 4/15
Affected reach 6/15
Confidence 8/10
Evidence quality 4/5
Human-validated context

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