@Kimura, Hiroki/木村 浩希
The cipher would depend on the mutual highest with client. You can set your storage account to require TLS1.2 by following this document. The supported cipher suites for TLS can be found on this OpenSSL page. I am not aware of Azure restricting any outside this list. If you have specific concerns I am happy to address them with our service team.
Hope this helps. Let me know if you still have questions or need further assistance.
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