#### Vol. 2, 2019

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Generating subgroups of ray class groups with small prime ideals

### Benjamin Wesolowski

Vol. 2 (2019), No. 1, 461–478
##### Abstract

Explicit bounds are given on the norms of prime ideals generating arbitrary subgroups of ray class groups of number fields, assuming the extended Riemann hypothesis. These are the first explicit bounds for this problem and are significantly better than previously known asymptotic bounds. Applied to the integers, they express that any subgroup of index $i$ of the multiplicative group of integers modulo $m$ is generated by prime numbers smaller than $16{\left(ilogm\right)}^{2}$, subject to the Riemann hypothesis. Two particular consequences relate to mathematical cryptology. Applied to cyclotomic fields, they provide explicit bounds on generators of the relative class group, needed in some previous work on the shortest vector problem on ideal lattices. Applied to Jacobians of hyperelliptic curves, they allow one to derive bounds on the degrees of isogenies required to make their horizontal isogeny graphs connected. Such isogeny graphs are used to study the discrete logarithm problem on said Jacobians.

##### Keywords
class group, ray class group, prime ideal, isogeny graph
##### Mathematical Subject Classification 2010
Primary: 11R29
Secondary: 11M06, 11R37, 14K02