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{div:style=padding-lefttop:1.5em;text-indent:-1.5em;}The _production metadata aggregate_ is5ex;}All metadata aggregates are signed usingwith athe newsame self-signedmetadata signing certificate (but with the same key) and a [SHA-2|https://en.wikipedia.org/wiki/SHA-2] digest algorithm (specifically, SHA-256)have exactly the same content.{div}
{div:style=padding-left:1.5em;text-indent:-1.5em;}The _fallback metadata aggregate_ is identical to the production metadata aggregate except that the fallback metadata aggregate is
_Production Metadata Aggregate_
* signed using the SHA-256 digest algorithm
* verify with a new self-signed certificate

_Fallback Metadata Aggregate_
* signed using the SHA-1 digest algorithm. On June 30, 2014, the fallback metadata aggregate will be sync'd with the production metadata aggregate.{div}
{div:style=padding-left:1.5em;text-indent:-1.5em;}The _preview metadata aggregate_ is 
* verify with a new self-signed certificate

_Preview Metadata Aggregate_
* (identical to the productionProduction metadata aggregate.{div}
{div:style=padding-left:1.5em;text-indent:-1.5em;}The _legacy metadata aggregate_ will remain as-is until March 29, 2014, at which time an HTTP redirect from the legacy metadata aggregate to the fallback metadata aggregate will be installed.{div}
{div}Metadata Aggregate)

_Legacy Metadata Aggregate_
* signed using the SHA-1 digest algorithm
* verify with the old CA-signed certificate

See the [InCCollaborate:Phase 1 Implementation Plan] of the Metadata Distribution Working Group for more information.