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Hide an encrypted message inside a photo, in the browser

Hide an encrypted message inside a photo, in the browser

by trivsamt·Jul 2, 2026·1 point·0 comments

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SecurityMid

Using subliminal channels to hide data in TLS handshakes

Uses EdDSA signatures to smuggle arbitrary bytes through TLS handshakes — a classic subliminal-channel trick applied to modern TLS code. The repo includes an actual client/server PoC (https_client.c, https_server.c), a cert generation script, and a bundled wolfSSL build so you can reproduce the experiment. Clever demo, but it reads like research code rather than a hardened tool: there's little on threat modelling, detection, or performance trade-offs.

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