add correlation and modify capture overview poster

lv/correlation/notes.typ

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+= Problem Statement
+
+The problem of log verification can be devided in sub-problems. The concept of correlation is introduced in the sub-problem 1.1.
+
+== Problem 1
+
+Given a tuple of time series and even series $(t,e)$, establish whether the event series was tampered with.
+
+== Problem 1.1
+
+Given a tuple of time series and even series $(t,e)$, compute a correlation coefficient presenting a monotonic relationship with the number of changes applied to the event series.
+
+== Problem 1.2
+
+Given a set of correlation coefficient computed from known-good $(t,e)$ tuples and a new coefficient computed from an unverified tuple $(t_u,e_u)$, verify whether $e_u$ was tampered with.
+
+= Related Work
+
+