Done on 20121105:
  Plan for lectures to come.
  Some publicity about DL record for GF(2^619)
  Congruences of squares;
  Dixon;
  CFRAC;
  Ideas behind QS, but not going into sieving yet.
  Adleman's algorithm for discrete logs. Subtletlies on the linear system
  being solved.
  Elements for analysis. Canfield-Erdos-Pomerance as an L function.
  Exercices for the last 15mn. Asymptotic row weight in algorithms based
  on smoothness tests. Minimum safe key length as a function of time in
  presence of a subexponential attacker algorithm.