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https://en.wikipedia.org/wiki/One-time_pad

What’s the significance of the first six characters? They repeat them multiple times before reading off the full message multiple times.

Those six are the preamble, they identify the message.

If you wanted to ask someone whether they received a message, you'd ask if they received the preamble, and not the entire message which can be quite long.

An OTP is secure only if the key is truly random.

As we saw from eMudhra this week, people do stupid things.

eMudhra does stupid things, NSA does not. Not with NC2.

There are four lights.

I wonder if the programmer too got brainwashed-failed in ST:NG