Title: Primality testing Speaker: Hendrik Lenstra Summary In the summer of 2002, three Indian computer scientists showed that there exists a deterministic polynomial time algorithm that tests a given integer for primality. Their algorithm allows an algebraic formulation, which reveals a connection with another fundamental computational problem, namely, the problem of constructing finite fields. This insight leads to a significant improvement in the Indian primality test, both from a practical and from a theoretical perspective. Prerequisites Elementary number theory and basic abstract algebra. A number of results from computer algebra, algebraic number theory, and analytic number theory may be taken for granted.