Encryption Keys Rotation

Hello People...

Have a query regarding Key Rotation activity. As per the regulatory requirements, we are required to perform encryption key rotation on an annual basis. So just wanted to know few things about it -
1. How to manage historical data which was encrypted with an old key?
2. How to identify data which was encrypted with new keys post rotation?
3. Is it necessary that we have to decrypt and then re-encrypt all the old data with the …

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