IBM Systems Magazine, Power Systems - June 2015 - 52

R&D

need to access. Now the question
is how does that process work?

password hashes, a method by
which passwords are encrypted
using fixed-length fields before
they're stored. In some sense,
this isn't as bad as the passwords
themselves, but these hashes can
be used for an offline dictionary
attack [an attempt to defeat
an authentication mechanism
by trying hundreds or even
millions of likely passphrase
possibilities, such as words in a
dictionary]. These attacks have
become so efficient on modern
hardware that your password
is essentially broken as soon as
the password hash of it has been
leaked. That's pretty much what
our protocol addresses. Instead
of having password hashes on
which a dictionary attack can be
performed, we split the password
verification so none of those
servers sits on any one database
with hashes.
ISM: So is your proposal to
split master passwords across
different servers?
Jan Camenisch (JC): Right.
Instead of just storing passwords
on your computer, you would also
store them in a digital fashion on
multiple servers such that none of
the servers by themselves would
contain the entire key. If there
were an attack, it would have to
compromise most or some threshold of servers. If the attack doesn't
do that, nobody gets your keys.
But we've kind of bitten our
tails because now you would have
to authenticate to those servers
with your password to get those
keys back so you can log in to the
original server that you want to
authenticate to. That is where our
protocol comes into play, where
we can enter our master password
on a desktop computer or mobile
phone that would then retrieve
the encrypted keys from those
servers and then, with those keys,
allow you to log in to the site you
52 // JUNE 2015 ibmsystemsmag.com

Jan Camenisch (above) and Maria
Dubovitskaya were part of a team
to develop a new technology to
"mask" online passwords.

VIDEO
EXTRA
Watch Gregory Neven discuss
the Memento Protocol:
youtu.be/O_0pt90IBTc

ISM: And how would it work?
JC: I would compare this to your
banking card. Your four-digit
PIN works because the ATM will
swallow your card if you incorrectly enter your password three
times. That's why passwords work
for ATMs but not for websites,
because if you steal the password
file or the hash file from someone,
you can attempt as many offline
attacks as you want and nobody is
stopping you from doing that.
This is how our protocol is
different. We distribute the
password to many servers, so if
you just hack or break into a few
of those servers, you don't have
enough information about the
password to run an offline attack.
You can only run an online attack,
with the servers realizing, "Okay,
somebody tried for the third time
in a row to enter a password but
didn't do it correctly. We can now
shut down the account."
GN: Of course, shutting down
is extreme. Instead, you could
simply slow down the attack by
enforcing time delays between
different attempts or, for example,
presenting a CAPTCHA, which
are distorted letters to determine
whether there's a human at the
other side of the line or a machine
conducting a brute force attack.
ISM: How would this work
if, say, I'm going to Facebook?
GN: You would have a separate
password for Facebook-a completely random one, a password
that you would never be able
to remember because it's too
complex. Instead, you would store
it in a password file that's in the
cloud but in an encrypted form
under a strong key that you're going to recover using our protocol.
So when you log in to
Facebook, you're not actually


http://youtu.be/O_0pt90IBTc http://www.ibmsystemsmag.com

IBM Systems Magazine, Power Systems - June 2015

Table of Contents for the Digital Edition of IBM Systems Magazine, Power Systems - June 2015

Table of Contents
Editor's Desk: Something new
Techbits: Opening up X-Force
Partner PoV: When going paperless, don't keep one foot in the boar and the other on the dock
Infographic: IBM Power Systems: Architecture any way you choose to scale it
Case Study: Dollars and Sense: The Cooperative Bank of Cape Code takes a two-pronged approach to backups and disaster recovery
Cover Story: A Full Lineup: GM Doug Balog introduces the E850, PurePower and more
Feature: Making In-Memory Magic: Grow your business with near-real-time insights from DB2 BLU and SAP HANA
Tech Showcase: Companies large and small strive to transform their applications
Trends: Today's flexible training options fit time and budget constraints
IT Today: IBM X-Force report reveals challenges and strategies to succeed in the new computing environment
R&D: IBM Research is working on a new protocol that will help simplify and secure online password use
Solutions: Reflections for UNIX; iOS and Android Editions, CONSOLE 6; iSecMap; MIMIX 8.0; MDRapid
Snapshot: Ed Berryhill
Reference Point - Global Events, Education, Resources for Power Systems
2015 Power Systems Solution Edition Product Index
IBM Systems Magazine, Power Systems - June 2015 - Intro
IBM Systems Magazine, Power Systems - June 2015 - Cover1
IBM Systems Magazine, Power Systems - June 2015 - Cover2
IBM Systems Magazine, Power Systems - June 2015 - 1
IBM Systems Magazine, Power Systems - June 2015 - Table of Contents
IBM Systems Magazine, Power Systems - June 2015 - 3
IBM Systems Magazine, Power Systems - June 2015 - 4
IBM Systems Magazine, Power Systems - June 2015 - Editor's Desk: Something new
IBM Systems Magazine, Power Systems - June 2015 - Techbits: Opening up X-Force
IBM Systems Magazine, Power Systems - June 2015 - Partner PoV: When going paperless, don't keep one foot in the boar and the other on the dock
IBM Systems Magazine, Power Systems - June 2015 - 8
IBM Systems Magazine, Power Systems - June 2015 - 9
IBM Systems Magazine, Power Systems - June 2015 - Infographic: IBM Power Systems: Architecture any way you choose to scale it
IBM Systems Magazine, Power Systems - June 2015 - 11
IBM Systems Magazine, Power Systems - June 2015 - Case Study: Dollars and Sense: The Cooperative Bank of Cape Code takes a two-pronged approach to backups and disaster recovery
IBM Systems Magazine, Power Systems - June 2015 - 13
IBM Systems Magazine, Power Systems - June 2015 - 14
IBM Systems Magazine, Power Systems - June 2015 - 15
IBM Systems Magazine, Power Systems - June 2015 - 16
IBM Systems Magazine, Power Systems - June 2015 - 17
IBM Systems Magazine, Power Systems - June 2015 - Cover Story: A Full Lineup: GM Doug Balog introduces the E850, PurePower and more
IBM Systems Magazine, Power Systems - June 2015 - 19
IBM Systems Magazine, Power Systems - June 2015 - 20
IBM Systems Magazine, Power Systems - June 2015 - 21
IBM Systems Magazine, Power Systems - June 2015 - 22
IBM Systems Magazine, Power Systems - June 2015 - 23
IBM Systems Magazine, Power Systems - June 2015 - Feature: Making In-Memory Magic: Grow your business with near-real-time insights from DB2 BLU and SAP HANA
IBM Systems Magazine, Power Systems - June 2015 - 25
IBM Systems Magazine, Power Systems - June 2015 - 26
IBM Systems Magazine, Power Systems - June 2015 - 27
IBM Systems Magazine, Power Systems - June 2015 - 28
IBM Systems Magazine, Power Systems - June 2015 - Tech Showcase: Companies large and small strive to transform their applications
IBM Systems Magazine, Power Systems - June 2015 - 30
IBM Systems Magazine, Power Systems - June 2015 - 31
IBM Systems Magazine, Power Systems - June 2015 - 32
IBM Systems Magazine, Power Systems - June 2015 - 33
IBM Systems Magazine, Power Systems - June 2015 - 34
IBM Systems Magazine, Power Systems - June 2015 - 35
IBM Systems Magazine, Power Systems - June 2015 - 36
IBM Systems Magazine, Power Systems - June 2015 - 37
IBM Systems Magazine, Power Systems - June 2015 - 38
IBM Systems Magazine, Power Systems - June 2015 - 39
IBM Systems Magazine, Power Systems - June 2015 - 40
IBM Systems Magazine, Power Systems - June 2015 - 41
IBM Systems Magazine, Power Systems - June 2015 - 42
IBM Systems Magazine, Power Systems - June 2015 - 43
IBM Systems Magazine, Power Systems - June 2015 - 44
IBM Systems Magazine, Power Systems - June 2015 - Trends: Today's flexible training options fit time and budget constraints
IBM Systems Magazine, Power Systems - June 2015 - 46
IBM Systems Magazine, Power Systems - June 2015 - 47
IBM Systems Magazine, Power Systems - June 2015 - IT Today: IBM X-Force report reveals challenges and strategies to succeed in the new computing environment
IBM Systems Magazine, Power Systems - June 2015 - 49
IBM Systems Magazine, Power Systems - June 2015 - 50
IBM Systems Magazine, Power Systems - June 2015 - R&D: IBM Research is working on a new protocol that will help simplify and secure online password use
IBM Systems Magazine, Power Systems - June 2015 - 52
IBM Systems Magazine, Power Systems - June 2015 - 53
IBM Systems Magazine, Power Systems - June 2015 - Solutions: Reflections for UNIX; iOS and Android Editions, CONSOLE 6; iSecMap; MIMIX 8.0; MDRapid
IBM Systems Magazine, Power Systems - June 2015 - 55
IBM Systems Magazine, Power Systems - June 2015 - Snapshot: Ed Berryhill
IBM Systems Magazine, Power Systems - June 2015 - Cover3
IBM Systems Magazine, Power Systems - June 2015 - Cover4
IBM Systems Magazine, Power Systems - June 2015 - Reference Point - Global Events, Education, Resources for Power Systems
IBM Systems Magazine, Power Systems - June 2015 - 2015 Power Systems Solution Edition Product Index
IBM Systems Magazine, Power Systems - June 2015 - SE2
IBM Systems Magazine, Power Systems - June 2015 - SE3
IBM Systems Magazine, Power Systems - June 2015 - SE4
IBM Systems Magazine, Power Systems - June 2015 - SE5
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