> From: FileMatrix [mailto:[EMAIL PROTECTED] 

> It seems to me that the first thing one does to protect a system from
> automated attacks is to forbid access attempts to the same account 
> more than once every x (say 10) seconds.

> This means that even with constant attempt to crack the 
> password and the
> Turing number, the cracker can't do his job in real-time.

> Regards,
> George Hara

I agree with you George, but I would be concerned that such a lock out
system not be used as a denial of service method for attackers. For
example, a competitor could make a login attempt every nine, ten or
eleven seconds to the FileMatrix e-gold account and then take advantage
of the disgruntled FileMatrix customers who got bad service.

As a solution it may be wise for the e-gold system to lock out only
repeated attempts from the same IP address, and hope that the attacker
is not coming through your own ISP and possibly the same proxy server.
At least this reduces the potential for success of this method as a DNS
attack. If a competitor on the same IP is attacking it may be easier to
find them. Of course, something more intricate may be necessary in the
face of IP Spoofing and such.

I suppose I should not let it go unmentioned that some other Digital
Gold Currencies such as Pecunix have a good defence against account
targetting attacks. A different, public account number, for example
one's e-mail address is used for people to pay you, while a secret
account number is used to log in!

I wonder what it would take for e-gold to reorganise the account number
system. I think if they did so they should keep the existing numbers, as
they are both already public, and account holders may actually like
their number or have purchased convenient numbers. Therefore a new
numbering system (with numbers and letters, like the GoldMoney accounts)
could be used for the actual logins.

Regards,
Ian Green

http://iangreen.2cw.org



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