Re: [Proposal] Table-level Transparent Data Encryption (TDE) and KeyManagement Service (KMS)

> What I think Tomas is getting at here is that we don't write a page only
> once.

> A nonce of tableoid+pagenum will only be unique the first time we write
> out that page.  Seems unlikely that we're only going to be writing these
> pages once though- what we need is a nonce that's unique for *every
> write* of the 8k page, isn't it?  As every write of the page is going to
>  be encrypting something new.

> With sufficient randomness, we can at least be more likely to have a
> unique nonce for each 8K write.  Including the LSN seems like it'd be a
> possible alternative.

Agreed.  I know little of the inner details about the LSN but what I read in [1] sounds encouraging in addition to tableoid + pagenum.

[1] https://www.postgresql.org/docs/current/datatype-pg-lsn.html  

Ryan Lambert