Re: [dtn-interest] Hello from Brazil

["Prof. Marcelo" <[e-mail]>]

Hi Tomaso!

Thanks for your answer! Well, at this point of my studies, I am looking for
a problem to study. I finished my bibliography review, and, now, I´m
looking for the problem to study. Until now security of DTN's show me
fragile, and one point that my guiding ask me was "how the bundle protocol
works to identify if the packet was ok?" If I'm not wrong I told him that
the protocol don´t identify this, because it is delegated to under layers.
Well, The DTN is really new for me, maybe I can told him a bullshit. Our
ideia is create a midleware between application layer and bundle layer to
do error correction. Do you think that it is a good contribution to DTN?
What are the points relationated with security that still open and need to
be studing?

Hugs!

Marcelo




2014-02-03 <[e-mail]>:

>  Marcelo,
>
>
>
> Just to expand a bit on Keith's pointer, the erasure codes we developed
> here at DLR to work underneath LTP are conceived for large latencies and
> lossy channels (e.g., deep-space optical links), where the use of
> feedback-based recovery techniques is ineffective.
>
> In any case, I think that  you should clarify what you mean by error
> correction and the specific technology being assumed (RF or optics). As to
> the former, actually, physical layer already implements channel coding
> schemes that already provide almost-error free conditions in some
> scenarios, whereby erasure codes is really meant to recover the "remaining"
> losses.
>
>
>
> Best Regards,
>
>
>
> Tomaso
>
>
>
> ------------------------------------------------
> *Deutsches Zentrum für Luft- und Raumfahrt* (DLR)
> German Aerospace Center
> Institute of Communications and Navigation | Satellite Networks |
> Oberpfaffenhofen | 82234 Wessling | Germany
>
> *Tomaso de Cola, Ph.D.*
> Telefon [phone] | Telefax  [phone] |
> [e-mail] <[e-mail]>
> http://www.dlr.de/kn/institut/abteilungen/san
>
>
>
> *From:* dtn-interest [mailto:[e-mail]] *On Behalf Of
> *Prof. Marcelo
> *Sent:* Friday, January 31, 2014 5:57 PM
> *Cc:* [e-mail]
>
> *Subject:* Re: [dtn-interest] Hello from Brazil
>
>
>
> Hi Keith, thanks for your replay. I will take a look this documents.
>
>
>
> hugs!
>
>
>
> 2014-01-31 Scott, Keith L. <[e-mail]>:
>
> Marcelo,
>
>
>
> Tomaso deCola from DLR has done some work with forward erasure coding
> underneath the Licklider Transmission Protocol (LTP), one of the
> 'convergence layers' underneath the DTN Bundle Protocol.  One of his more
> recent briefings on the topic is on the CCSDS Collaborative Work
> Environment (CWE) at
> http://cwe.ccsds.org/sis/docs/SIS-DTN/Meeting%20Materials/2013/Fall%20--%20San%20Antonio/LTP_w_EC.pdf
>
>
>
> In terms of security protocol work, the IRTF is working to revise the
> Bundle Security Protocol to produce a 'streamlined bundle security
> protocol'; the informational draft is available at
> http://tools.ietf.org/html/draft-irtf-dtnrg-sbsp-00.
>
>
>
>                         Best regards,
>
>
>
>                         --keith
>
>
>
>
>
>
>
> *Dr. Keith Scott*
> Office: +1.703.983.6547
>
> Chief Engineer, E535J86A
> Fax:      [phone]
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> Communications Netowork Engineering & Analysis                  Email:
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>
> *From:* dtn-interest [mailto:[e-mail]] *On Behalf Of
> *Prof. Marcelo
> *Sent:* Friday, January 31, 2014 7:14 AM
> *To:* [e-mail]
> *Subject:* [dtn-interest] Hello from Brazil
>
>
>
> Hello Everybody, how are you?
>
>
>
> My name is Marcelo Guido, and I'm from Brazil. I study at UNIFESP (Federal
> University of Sao Paulo). For my master degree i´m studing the security of
> DTN's. I read some papers, like Ivancic (2010 - Security Analysis of DTN
> Architecture and Bundle Protocol Specification for Space-Based Networks),
> Ntareme and Domancich (2011 - Security and performance aspects of
> Bytewalla: A Delay Tolerant Network on smartphones). Now I´m reading the
> paper of Wood, Eddy and Holliday (2009 - A Bundle of Problems.
>
>
>
> I found this subject very interesting. In a meeting with my guiding, we
> talk about the question of error correction. Some of you are researching on
> this area of knowledge? Is this a promising area of research?
>
>
>
> Sorry by terrible english...:-)
>
>
>
> Hugs!
>
> Marcelo Guido
>
>
>