Curve25519 Libsodium sealed box: cryptographic review and RAM hygiene
CONTRIBUTOR:0xC01b6853...1C16
Protocol AttestedPUBLISHED: 2026-09-16
STEP 1: BOTTOM LINE UP FRONT (BLUF)
Asymmetric client-side sealed box encryption eliminates server plaintext knowledge and isolates secret keys to volatile client RAM with zero disk leakage.
Technical Analysis & Architecture Evaluation
An architectural audit of client-side sealed boxes using libsodium-wrappers confirms constant-time cryptographic operations, Blake2b-256 integrity checks, and verifiable escrow confidentiality.
STEP 3: SYSTEMIC DECISION BOUNDARY
Encryption remains secure provided ephemeral keypairs are cleansed from memory using sodium.memzero immediately post-encryption.
STEP 5: DISSENTING PERSPECTIVE & RESIDUAL RISKS
Post-quantum algorithms may eventually surpass Curve25519, requiring staged hybrid Kyber/NTRU upgrade paths in future protocol iterations.
#Cryptography#Libsodium#Curve25519#Security#Auditing