Yashotantra Academy logo
← React Native theorytheory 0/50 · 0%
level 1
Curious · 0 XP
streak
0d
perfect
0
badges
0

100 XP to Apprentice

Security · medium

29. Secure storage and biometrics

Protecting keys and enabling biometric unlock.

1 min read3 questionsup to 50 XPtopic 29/50

Read in another language

AI translates the explanation and quiz text while preserving code and answer scoring.

Sensitive data like a wallet's encrypted seed should live in hardware-backed secure storage (`react-native-keychain` or `expo-secure-store`), not AsyncStorage, and biometric prompts add a second factor before revealing it.

import * as SecureStore from "expo-secure-store";

async function saveSecret(key: string, value: string) {
  await SecureStore.setItemAsync(key, value);
}

async function readSecret(key: string): Promise<string | null> {
  return SecureStore.getItemAsync(key);
}

Even with secure storage, never display a full seed phrase without an explicit user action and a warning — assume the screen could be recorded or shoulder-surfed.

How to study this topic

  1. 1. Read the explanation once end to end, skipping the code.
  2. 2. Re-read the code snippets and say out loud what each line does.
  3. 3. Answer the quiz without scrolling back — that is the real check.
  4. 4. Read every explanation, even for the answers you got right.

Scoring

  • · Up to 30 XP from quiz accuracy.
  • · +15 XP for a perfect first attempt.
  • · +5 XP while a 3-day streak is running.
  • · 75% or higher marks the topic complete.

Check your understanding

  1. 1. Where should an encrypted wallet seed be stored?

  2. 2. What adds a second factor before revealing secrets?

  3. 3. Why be cautious about displaying a seed phrase on screen?

Badges

First light
Pass your first topic
Sharp shooter
3 perfect first-try quizzes
On a roll
Study 3 days in a row
Week warrior
Study 7 days in a row
Grinder
Earn 500 XP
Deep diver
Earn 1500 XP