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Re: Key lengths for file_key_management plugin


On 07/15/2016 11:31 AM, Sergei Golubchik wrote:
Hi, Honza!

On Jul 14, Honza Horak wrote:
I've asked directly in the documentation page, but maybe someone will
know answer here:

In that article it is said that 128, 192 or 256-bit keys are supported,
but later AES_CTR and AES_CBC modes talk only about 128bit keys. What
piece of information am I missing?

The article says "the plugin will use AES with the 128-bit keys in
the CTR mode for encrypting tablespace pages".

Because tablespace pages are always encrypted with a 128-bit tablespace
key. Which is different for every tablespace and it is generated from
the user-specified key, which might be 128-, 192-, or 256-bit.

Temporary files and binary logs are encrypted directly with the
user-specified key of a user-specified length.

Thanks for the answer, but one more question to make sure I understand it correctly -- in case of choosing CBC mode, 128 keys are used only for tablespace pages or also for temporary files and binary logs?


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