Verisign is in the process of increasing the size and strength of
the DNSSEC Zone Signing Keys (ZSKs) for the top-level domains that
it operates. As part of this process, the ZSK for the .ARPA zone
will be increased in size from 1024 to 2048 bits.
On July 11, 2019 the 2048 bit ZSK will be pre-published in the .ARPA
zone. On July 21, the .ARPA zone will be signed with the 2048 bit
ZSK. On August 10, the 1024 bit ZSK will be removed from the zone.
We do not anticipate any problems from this upgrade. In accordance
with our normal operating procedures we have a rollback process
should it become necessary to revert to the 1024 bit ZSK.