79: Passcode derivation

79_passcode_derivation/main.go

@@ -0,0 +1,11 @@
+package main
+
+//A common security method used for online banking is to ask the user for three random characters from a passcode. For example, if the passcode was 531278, they may ask for the 2nd, 3rd, and 5th characters; the expected reply would be: 317.
+//
+//The text file, keylog.txt, contains fifty successful login attempts.
+//
+//Given that the three characters are always asked for in order, analyse the file so as to determine the shortest possible secret passcode of unknown length.
+
+func main() {
+
+}