Another user tries to write a new data piece to his hard drive, but there is no space left. He refuses to delete anything since ‘he will need it later’. What should we do in this situation?

Such a problem is not a unique one. We have terabytes of data laying somewhere on our hard drives and it is not going to shrink any time soon. But how unique is it? All in all, every file is just a bit sequence, and it is probable that every new one is not all that different from the already stored ones.


We used to think of Telegram as a reliable and secure transmission medium for messages of any sort. But under the hood it has a rather common combination of a- and symmetric encryptions. Where’s fun in that? And why would anyone trust their private messages to a third-party anyway?

Spy vs Spy art by Antonio Prohías

TL;DR — inventing a private covert channel through users blacklisting each other.

Covert channels

There are many workarounds to transmit data between two users avoiding direct contact. You can use a middlemen, crypto- and steganography methods, broadcasting relay networks, and other extensions of existing protocols. But sometimes it’s useful being able to establish…

Labunsky Artem

Russian information security specialist (literally stated in my ISCED-7 diploma). Looking for a job.

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