Welcome to SecNet.Red

Decode the silence. Communicate at vortex@secnet.red.
Greetings, Traveller,
You've reached the nexus where data streams collide and realities fold. Your message has been encrypted in the web of chaos and now waits in the queue of the unknown.
To pass the time in the digital limbo, solve this puzzle:
I am the key without a lock, the echo in the digital block. Seen both at dawn and dusk alike, yet absent in the black of night. What am I?
Unravel this cipher and encode your discovery in the subject line of your message to traverse deeper into the abyss. Your active participation is crucial. Maintain your connection to this frequency and await further instructions.
— Vortex