Hello,
I just read this draft.
in section 3, of draft-ietf-dane-openpgpkey-03.txt
"
If it("local-part" in the mail message ) is written in another encoding it
should be
converted to UTF-8. Next, it is turned into lowercase and hashed
using the SHA2-256 [RFC5754] algorithm, with the hash truncated to
28 octets and represented in its hexadecimal representation, to
become the left-most label in the prepared domain name.
Truncation comes from the right-most octets. This does not
include the at symbol ("@") that separates the left and right
sides of the email address.
"
Question:
1, why should it be hash truncated to 28 octets ? why choose 28 not other
numbers?
2,since some local-parts are longer than 28 octets, are there some collisions
after hash truncated to 28 octets ?
Best Regard
Jiankang Yao_______________________________________________
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