Hi all,
Pete, thank you for the comments.
I've changed the draft and took into account all the comments from this
email. Some comments are below, inline.
Suresh Krishnan wrote:
Introduction:
There is a great variaty of hash functions, but only MD5 and SHA-1
are in the wide use, which is also the case for SEND
This sentence makes a statement about MD5 and SHA-1 being the only
widely
used hash functions, but I can't figure out what it is saying about
SEND.
Is it saying that SEND is widely used? Or did you mean to say that SEND
implementations typically only implement MD5 and SHA-1?
The latter. I propose changing the text to
"There is a great variety of hash functions, but only MD5 and SHA-1
are widely used. SEND implementations also typically use these two
hash algorithms."
I've changed the text according to your suggestion Suresh.
But this sentence is just plain
incorrect (see below).
Due to
the birthday attack, if the hash function is supplied with a random
input, it returns one of the k equally-likely values, and the number
of operations can be reduced to the number of 1.2*2^(n/2) operations.
There is no "birthday attack." And I think you meant 2^n instead of k.
The result you give is due to an equation that is commonly illustrated
with
a problem known as the "birthday paradox."
Right. A birthday attack is an attack that exploits the mathematics
behind the birthday paradox. It is a fairly commonly used term. Would
you like me to change something?
That's right -- birthday attack is common term, but only in
cryptography. I was relying on Bruce Schneier's book "Applied
cryptography" where he uses both the term "birthday attack" and the
equation. Maybe i can make the sentence more clear:
"Due to the birthday attack, if the hash function is supplied with a
random input, it returns one of the equally-likely n-bit hash values,
and the number of operations can be reduced to the number of 1.2*2^(n/2)
operations."
Other comments are fixed.
Ana
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