I was trying to emulate the style found in some math textbooks of having titled paragraphs through a sidebar of sorts, and i was wondering what the best way to go about it was. For now, i am (ab?)using the itemize environment, by changing item names at will, i.e.
\begin{itemize}
\item[Encryption] \textit{Encrypting} means you care about the message's...
\item[Signing] When you sign a message...
\end{itemize}
As you can see, it "works", as long as the paragraph title is not too long, but it does get cumbersome as the paragraphs get longer, and in particular i can't see myself writing a whole document like this (this example was more of a paragraph within a larger document.
Is there an easier way to get this effect? Thanks in advance!

titleseccan do that for you. The manual has just such an example on p. 22. – Ingmar Jun 12 '22 at 06:00itemizekeys bydescription? If you are no are not happy with this new format, see also here. – Fran Jun 12 '22 at 10:49