Encryption level used to encrypt data stored in vaults

As we know, vault allows to store sensitive data, such as security credentials for back-end services, in encrypted format so that they are protected from unauthorized use as documented here

We would like to know what is the encryption level used for encrypting data stored in the vaults ? Is it AES 128, AES 256, etc ? Can you please provide a detailed document for the same ?

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@Prathima Rao - can you comment on this question?