[Cisspstudy] cisspstudy Digest, Vol 19, Issue 16
gerritsjs
gerritsjs at gmail.com
Tue Jan 19 20:32:13 EST 2010
Clement,
Agree, the question is not properly vetted and also agree that in ASYMMETRIC
the total number of keys is 20.
Also, agree in symmetric the total number of keys is N(N-1)/2.
_____
From: cisspstudy-bounces at cccure.org [mailto:cisspstudy-bounces at cccure.org]
On Behalf Of Clement Dupuis
Sent: Tuesday, January 19, 2010 4:07 PM
To: The CISSP Study Mailing list
Cc: twitwicki at hannaford.com
Subject: Re: [Cisspstudy] cisspstudy Digest, Vol 19, Issue 16
Good day,
I agree with Tom that it seems like the questions were definitively not
vetted properly.
The total number of keys needed for asymmetric is simply total number of
users multiply by 2
10 users is 20 keys that would be created overall.
If it was Symmetric then you would use the formula: total number of users X
total number of users minus one divided by two. 10 x (10-1)/2 which is
45 keys.
For the second question: all the services would be provided using Digital
Signatures which can only be achieve within asymmetric crypto systems.
While creating the digital signature the hashing algorithm would be use.
Take care
Clement
On Tue, Jan 19, 2010 at 16:07, Nimal Gunarathna <ng949 at yahoo.com> wrote:
Hi Tom,
This question puzzles me..
In an asymmetric system how many keys are required for 10 users to fully
communicate?
Every user has a one private and a one public key. I can send my same public
key to all others. For 10 people, 20 keys are needed.. I am not sure how 110
come from?
Is this a private com session or just a different comm session with each
pair?
Thanks,
Nimal Gunarathna
--- On Tue, 1/19/10, cisspstudy-request at cccure.org
<cisspstudy-request at cccure.org> wrote:
From: cisspstudy-request at cccure.org <cisspstudy-request at cccure.org>
Subject: cisspstudy Digest, Vol 19, Issue 16
To: cisspstudy at cccure.org
Date: Tuesday, January 19, 2010, 11:00 AM
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Today's Topics:
1. cisspstudy - Cryptography questions (twitwicki at hannaford.com
<http://mc/compose?to=twitwicki@hannaford.com> )
2. Re: New to CISSP Cert (Mark Price)
3. Re: New to CISSP Cert (jack wang)
4. Re: New to CISSP Cert (Jeronimo Zucco)
----------------------------------------------------------------------
Message: 1
Date: Mon, 18 Jan 2010 14:48:26 -0500
From: twitwicki at hannaford.com <http://mc/compose?to=twitwicki@hannaford.com>
To: cisspstudy at cccure.org <http://mc/compose?to=cisspstudy@cccure.org>
Subject: [Cisspstudy] cisspstudy - Cryptography questions
Message-ID:
<OF8F407D94.BBDB76DE-ON852576AF.006B4314-852576AF.006CCD97 at hannaford.com
<http://mc/compose?to=OF8F407D94.BBDB76DE-ON852576AF.006B4314-852576AF.006CC
D97 at hannaford.com> >
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Hello all,
I'd like your thoughts on these questions from Michael Gregg's CISSP
Practice questions:
In an asymmetric system how many keys are required for 10 users to fully
communicate?
A. 10
B. 20
C. 45
D 110
The answer states D. 110 - "Each user would have his private, phus his
public key, plus each of the nine other public keys"
Shouldn't the answer be B. 20 because the public keys is only couned once
for each private/public pair? This also seems consistent with the formula
for symmetric keys: N(N-1)/2 where N is the number of users needing to
communicate. In this case the secret key is only counted once even if it's
shared between users.
Here's another question that has me puzzled:
Which cryptographic system can be used for integrity, authenticity and
non-repudiation?
A. Asymmetric encryption
B. Symmetric encryption
C. Hashing
D. None of the above
The answers states A. Asymmetric. Shouldn't the answer be D. None of the
above because Hashing is needed for integrity?
Your thoughts will be much appreciated.
Tom Witwicki, CIPP
Director, Information Security
Hannaford Bros. Co.
207-885-2073
Join me on Linkedin!
http://www.linkedin.com/in/tomwitwicki
------------------------------
Message: 2
Date: Mon, 18 Jan 2010 21:47:45 +0000
From: "Mark Price" <prinext at gmail.com
<http://mc/compose?to=prinext@gmail.com> >
To: "The CISSP Study Mailing list" <cisspstudy at cccure.org
<http://mc/compose?to=cisspstudy@cccure.org> >
Subject: Re: [Cisspstudy] New to CISSP Cert
Message-ID:
<1180962559-1263851266-cardhu_decombobulator_blackberry.rim.net-147941822- at b
da153.bisx.prod.on.blackberry
<http://mc/compose?to=1180962559-1263851266-cardhu_decombobulator_blackberry
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I have heard each edition is an update of the previous plus more of the
latest technology and or standards.
I have the 4th and the DVD set, they plus cccure.org worked for me.
V/r,
Mark Price
PRINEXT
c:240-743-7654
mprice at prinext.com <http://mc/compose?to=mprice@prinext.com>
www.prinext.com
-----Original Message-----
From: Cert Prep <bugtraq.mailbox at gmail.com
<http://mc/compose?to=bugtraq.mailbox@gmail.com> >
Date: Mon, 18 Jan 2010 13:22:40
To: The CISSP Study Mailing list<cisspstudy at cccure.org
<http://mc/compose?to=cisspstudy@cccure.org> >
Subject: Re: [Cisspstudy] New to CISSP Cert
Thanks Jeronimo. I will listen to it.
I have Shon Harris Second Edition which I bought many years back. I
have heard that 5th edition is about to come. Is it ok to prepare from
second edition until 5th edition is out? Does anybody know the
differences between 2nd and 4th? I am sure there will be many but are
those drastic to the extent that I will have to revise the stuff,
which I have already gone through using second edition, from 5th
edition once it is published?
Any help would be appreciated.
Thanks.
Adam
On Mon, Jan 18, 2010 at 12:51 PM, Jeronimo Zucco <jczucco at gmail.com
<http://mc/compose?to=jczucco@gmail.com> > wrote:
> 2010/1/18 Cert Prep <bugtraq.mailbox at gmail.com
<http://mc/compose?to=bugtraq.mailbox@gmail.com> >:
>> Hi Folks,
>>
>> I am planning to prepare for CISSP Cert and would like to know which
>> book or material is best for the preparations.
>
>
> http://www.cccure.org/flash/intro/player.html
>
>
>
> --
> Jeronimo Zucco
> http://jczucco.blogspot.com
>
> _______________________________________________
> cisspstudy mailing list
> cisspstudy at cccure.org <http://mc/compose?to=cisspstudy@cccure.org>
> http://cccure.org/mailman/listinfo/cisspstudy_cccure.org
>
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------------------------------
Message: 3
Date: Tue, 19 Jan 2010 20:05:00 +0800
From: jack wang <windjie at gmail.com <http://mc/compose?to=windjie@gmail.com>
>
To: The CISSP Study Mailing list <cisspstudy at cccure.org
<http://mc/compose?to=cisspstudy@cccure.org> >
Subject: Re: [Cisspstudy] New to CISSP Cert
Message-ID:
<3c43566f1001190405t2bfd204as4a953dd160a5b92b at mail.gmail.com
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Shon Harris Second Edition,plus www.cccure.org,they are enough
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Message: 4
Date: Tue, 19 Jan 2010 10:34:19 -0200
From: Jeronimo Zucco <jczucco at gmail.com
<http://mc/compose?to=jczucco@gmail.com> >
To: The CISSP Study Mailing list <cisspstudy at cccure.org
<http://mc/compose?to=cisspstudy@cccure.org> >
Subject: Re: [Cisspstudy] New to CISSP Cert
Message-ID:
<2d6b298c1001190434i6f1eb72ct1157b63b80fe9301 at mail.gmail.com
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l.com> >
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All-in_one edition 5:
http://www.amazon.com/CISSP-All-One-Guide-Fifth/dp/0071602178/ref=sr_1_2?ie=
UTF8
<http://www.amazon.com/CISSP-All-One-Guide-Fifth/dp/0071602178/ref=sr_1_2?ie
=UTF8&s=books&qid=1263898897&sr=8-2> &s=books&qid=1263898897&sr=8-2
I always recommend the last edition, because of updates and
corretions. Or you can read all erratas for your edition.
2010/1/19 jack wang <windjie at gmail.com
<http://mc/compose?to=windjie@gmail.com> >:
> ?Shon Harris Second Edition,plus www.cccure.org,they are enough
>
--
Jeronimo Zucco
http://jczucco.blogspot.com
------------------------------
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