| Encryption at rest <br>Microsoft managed keys | Encryption is fully internalized in the indexing process, with no measurable impact on indexing time-to-completion or index size. It occurs automatically on all indexing, including on incremental updates to an index that is not fully encrypted (created before January 2018).<br><br>Internally, encryption is based on [Azure Storage Service Encryption](https://docs.microsoft.com/azure/storage/common/storage-service-encryption), using 256-bit [AES encryption](https://en.wikipedia.org/wiki/Advanced_Encryption_Standard).<br><br> Encryption is internal to Azure Cognitive Search, with certificates and encryption keys managed internally by Microsoft, and universally applied. You cannot turn encryption on or off, manage or substitute your own keys, or view encryption settings in the portal or programmatically.<br><br>Encryption at rest was announced in January 24, 2018 and applies to all service tiers, including the free tier, in all regions. For full encryption, indexes created prior to that date must be dropped and rebuilt in order for encryption to occur. Otherwise, only new data added after January 24 is encrypted.|
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