Re: Agenda for Encryption group meeting - 02-Feb-2005 at 1100 US/Eastern

From: Shalom.Bresticker@freescale.com
Date: Tue Feb 01 2005 - 19:44:30 PST

  • Next message: Shalom Bresticker: "re: data/digest_decrypt_key"

    I write these small comments from home and rather quickly, without deep thought:

    > 4.1) About transforming protect pragma directives during encryption:
    >
    > The example shows how the directives preceding the encryption
    > envelope (i.e., preceding the begin keyword) are transformed
    > and/or moved.
    >
    > In this example, the directives came immediately before the
    > envelope.
    >
    > What happens if the directives are far away, many lines before
    > the encryption envelope?
    >
    > What happens if they are even in a different file?
    >
    > What happens if the directives are followed by more than one
    > encryption envelope?
    >
    > Are the answers to these in the current text?
    >
    > -> Duplicate of 4.d from last meeting

    I think the questions here may widen the scope of the issue.

    > 4.4) 28.2 (now 28.3) is "Envelope Directives": This is a term which
    > is not used anywhere else, and is thus ambiguous.
    >
    > Further, the intro to this clause says that pragma expressions
    > PRECEDING begin or begin_protected are called 'envelope
    > keywords' where those after those keywords are 'CONTENT
    > keywords'.
    >
    > A similar question applies to the name of the following
    > subclause which is called 'Envelope encoding keywords': What
    > does it refer to and what not?

    Was this resolved? I don't say it wasn't, I haven't time to check now.

    > 4.5) Table 28-1 contains:
    >
    > data_decrypt_key Specifies the data encryption session key
    > digest_decrypt_key Specifies the digest encryption session key
    >
    > From the text in 28.3.14 and 28.3.20, it seems that these are
    > decryption keys, not encryption keys?
    >
    > -> These pragma expressions record the symmetric algorithm key
    > used during encryption. Does this need further explanation in
    > the text?

    I have not read the text in a systematic way. 'symmetric' means the same
    key is used for both encryption and decryption? Where does the text say that?
    Yes, if so, a reminder should be stated here. I'll add a few more words on this
    later.

    > 4.6) Need to clarify allowing white space in pragma expressions.
    >
    > -> Grammar currently permits white-space. This issue was fixed
    > in draft d4, approved in committee and by the WG. Is further
    > clarification needed?

    True, the BNF implies it. But the text should state it explicitly as well.

    Shalom 

    -- 
Shalom Bresticker                        Shalom.Bresticker @freescale.com
Design & Verification Methodology                    Tel: +972 9  9522268
Freescale Semiconductor Israel, Ltd.                 Fax: +972 9  9522890
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