Platform

Cross-Platform

Description

There appears to be a fair amount of low hanging fruit that, if my understanding is correct, may dramatically improve performance of encrypted packet usage (and by extension, battery usage). Areas of interest:

• Nodes relaying packets on encrypted channels must decrypt the entire payload. Encrypting a few bytes separately from the payload would allow relayers to check if they could decrypt the message without necessarily needing to.
• The shared secret used for encrypted channels is recomputed for every packet. Generating an ECDH secret is typically an order of magnitude (or more!) expensive than encryption/decryption. If true, caching secrets could cut CPU/battery usage during decryption by 50% or more for small packets (< 1kb). There are some hurdles to tackle like the memory usage of such a cache, but at a glance it appears achievable.

Feel free to assign this to me. I am still exploring the codebase.