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Category Archives for "Security"

Infosec is good people

For all that we complain about drama in our community, we are actually good people. At a small conference yesterday, I met "Kath". She just got her degree in advertising, but has become disillusioned. Her classes in web development and app development has shown her how exploitative online advertising can be. ("PHP has made me cry" -- yes, it's made all of us cry at some point).

She's felt alone, as if it were only her who that those feelings, then she discovered the EFF, and privacy activists like Yan (@bcrypt) who have been fighting for privacy. Kath grew up in the middle of nowhere in Texas, and went to college in another middle-of-nowhere place in Texas. Being a muggle, she's never heard of infosec before -- but she got a ticket and flew to New York to attend this little infosec conference where Yan was speaking. (Well, that and also to apply for the NYU graduate program in media).

She found things she didn't expect. She found, for example, how she can contribute, using her skills in usability to make crypto and privacy better for users. She also found a community that was accepting and approachable. Advertising is a Continue reading

Control Plane Protection in Cisco IOS

How does Internet work - We know what is networking

CoPP – Control Plane Protection or better Control Plain Policing is the only option to make some sort of flood protection or QoS for traffic going to control plane. In the router normal operation the most important traffic is control plain traffic. Control plane traffic is traffic originated on router itself by protocol services running on it and destined to other router device on the network. In order to run properly, routers need to speak with each other. They speak with each other by rules defined in protocols and protocols are run in shape of router services. Examples for this

Control Plane Protection in Cisco IOS

GRE over IPSec Tunnel Between Cisco and VyOS

The previous tutorial shown GRE tunnel configuration between Cisco router and Linux Core. The big advantage of GRE protocol is that it encapsulates L3 and higher protocols inside the GRE tunnel so routing updates and other multicast traffic can be successfully transferred over the tunnel. The main drawback of GRE protocol is the lack of built-in security. Data are transferred in plain-text over the tunnel and peers are not authenticated (no confidentiality). Tunneled traffic can be changed by attacker (no integrity checking of  IP packets). For this reason GRE tunnel is very often used in conjunction with IPSec. Typically, GRE tunnel is encapsulated inside the IPSec tunnel and this model is called GRE over IPSec.

The tutorial shows configuration of OSPF routing protocol, GRE and IPSec tunnel on Cisco 7206 VXR router and appliance running VyOS network OS. Devices are running inside GNS3 lab an they are emulated by Dynamips (Cisco) and Qemu (VyOS).

Picture1-Topology

Picture 1 - Topology

Note: VyOS installation is described here. You can easily build your own VyOS Qemu appliance using the Expect and Bash script shared in the article.

1. R3 Configuration

R3(config)# interface gigabitEthernet 1/0
R3(config-if)# ip address 1.1.1.1 255.255.255.0
R3(config-if)# no shutdown

R3(config-if)# interface gigabitEthernet 0/0
R3(config-if)# ip Continue reading

Jeb Bush is a cyber-weenie

Jeb Bush, one of them many 2016 presidential candidates, has numerous positions on "cyber" issues. They are all pretty silly, demonstrating that not only he but also his advisors profoundly misunderstand the issues.

For example, his recent position opposing "NetNeutrality" regulations says this:
these rules prohibit one group of companies (ISPs) from charging another group of companies (content companies) the full cost for using their services
Uh, no, that's how Democrats frame the debate. ISPs charging content providers is actually a very bad thing. That we Republicans oppose NetNeutrality is not based on the belief that "charging content companies" is a good thing.

Instead, NetNeutrality is about technical issues like congestion and routing. Congestion is an inherent property of the Internet. NetNeutrality shifts the blame for congestion onto the ISPs. NetNeutrality means the 90% of Comcast subscribers who do not use Netflix must subsidize the 10% who are.

Or at least, that's one of the many ways Republicans would phrase the debate. More simply, all Republicans oppose NetNeutrality simply because it's over-regulation. My point is that Jeb Bush doesn't realized he's been sucked into the Democrat framing, and that what he says is garbage.


A better example is Jeb's position Continue reading

Prez: Candidate synchronization

So last week I gave $10 to all the presidential campaigns, in order to watch their antics. One thing that's weird is that they often appear to act in unison, as if they are either copying each other, or are all playing from the same secret playbook.

The candidates must report their donations every quarter, according to FEC (Federal Elections Commission) rules. The next deadline is September 30th. Three days before that deadline, half the candidates sent out email asking for donations to meet this "critical" deadline. They don't say why it's critical, but only that's is some sort of critical deadline that must be met, which we can only do so with your help. The real reason why, of course, is that this information will become public, implicitly ranking the amount of support each candidate has.

Four days before this deadline, I didn't get donation pleas mentioning it. Three days before, half the candidates mentioned it. It's as if one candidate sees such an email blast, realizes it's a great idea, and send's out a similar email blast of their own.

Two days before the deadline, three of the candidates sent out animated GIFs counting down to the deadline. Continue reading

How Encryption of Network Traffic Works?

How does Internet work - We know what is networking

I recently started studying again, this time as an attempt of deep-diving into some security concepts for one of my PhD courses. It’s interesting how, as much as you try to escape from it, mathematics will sooner or later catch you somewhere and you will need to learn a bit more of it. At least that happened to me… In this process I realised that if you go beyond simple security theory and network device configuration all other stuff is pure mathematics. The reason behind my unplanned course in mathematics is explained through the rest of this text. It will

How Encryption of Network Traffic Works?

I gave $10 to every presidential candidate

What happens when your candidate drops out of the 2016 presidential race? What do they do with the roughly million names of donors they've collected?

I've decided that somebody needs to answer this question, so I've donated $10 to each of the roughly ~25 current presidential candidates (yes, even the hateful ones like Trump and Lessig). By donating money, I've put myself on the list of suckers who they can tap again for more donations. After the election next year, we'll be able to figure out how each candidate has used (or misused) the email addresses I gave them.

For most candidates, the first two pieces of information they ask of your is #1 your email address and #2 your zip code. They need the zip code so that when there is a local rally in your area, they can contact you to get your to turn out. But as a side effect, it means being able to extract favors from local politicians. 

Therefore, to do this right, I'd have to make a donation from every congressional/senate district in the country. I suspect one use of this information is when one Representative goes to another and says "If you Continue reading
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