From: Shalom Bresticker (Shalom.Bresticker@freescale.com)
Date: Wed Feb 02 2005 - 05:46:36 PST
I looked at this a little more.
The term 'asymmetric encryption algorithm' is used a few times in the main text,
but not defined.
The term 'symmetric' is used a few times in Annex H, but also not defined.
You have to remember that while a tool implementor will probably give this section
to an employee who understands protection schemes,
this is not true of a user. The section has to be written so that a user who is a
designer or verifier can understand it. Most will probably have less
background in encryption/decryption schemes than I do. I have a little because
I had a little interest in it when I was in college.
I looked again at the description of data_decrypt_key. There is nothing there that
implies that the key is symmetric or that it is an encryption key. The entire
description relates to it only as a decryption key. These two keywords are also the
only two keywords which mix the encryption and decryption terminology.
I really think this section is not mature editorially, with no reflection on its
> > 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
-- Shalom Bresticker Shalom.Bresticker @freescale.com Design & Verification Methodology Tel: +972 9 9522268 Freescale Semiconductor Israel, Ltd. Fax: +972 9 9522890 POB 2208, Herzlia 46120, ISRAEL Cell: +972 50 5441478
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