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Proving and Hiding your Identity on the Internet A high level overview Jon “The Nice Guy” Spriggs jon@spriggs.org.uk 2009-10-25

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Proving And Hiding Your Identity <ul><li>The nature of the Internet is to be anonymous.

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The nature of Controlled Networks is to be identifiable.

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How can we reverse these two situations to your benefit?

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Why would you want to? </li></ul>

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Prove your Identity on the Internet <ul><li>How do you prove your identity? </li><ul><li>Username and one-or-two factor authentication </li></ul><li>How do you secure your access to private data, hosts and networks? </li><ul><li>Physical presence, encrypted connections (PGP, VPN, SSL, SSH) </li></ul><li>How can you encourage trust? </li><ul><li>Securely exchange keys, protect physical objects, accept only trusted relationships </li></ul></ul>

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Explaining Terms: PGP / GPG <ul><li>What is GPG? </li><ul><li>A Free Software implementation of the PGP system, properly called “Gnu Privacy Guard” </li></ul><li>What is PGP? </li><ul><li>An encryption and authentication system </li></ul><li>Where would I use it? </li><ul><li>Signing data, ensuring no tampering has occurred

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Encrypting data, ensuring no unauthorized person has understood it's contents. </li></ul></ul>

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Example: Create GPG Key

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Example: Sign a file

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Example: Decrypt a file

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Explaining Terms: VPN <ul><li>What is a VPN? </li><ul><li>It is a Virtual Private Network – a method of ensuring a host or network is permitted to access a private network. </li></ul><li>Where would I use it? </li><ul><li>Connecting one or more networks or hosts together – usually from a laptop to a work network. </li></ul><li>What would I use? </li><ul><li>IPSEC, OpenVPN, SSH </li></ul></ul>

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Example: The simplest OpenVPN

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Example: The simplest OpenVPN

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Explaining Terms: SSL / TLS <ul><li>What is SSL (Secure Sockets Layer)? </li><ul><li>SSL is an old version of what is now called TLS </li></ul><li>What is TLS (Transport Layer Security)? </li><ul><li>TLS is how an encrypted link is created using certificates – for example when browsing to HTTPS sites. </li></ul><li>What would I use? </li><ul><li>HTTPS, IMAPS, FTP-S, Jabber, IRC </li></ul></ul>

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Example: SSL Certificates

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Explaining Terms: SSH <ul><li>What is SSH? </li><ul><li>A series of data channels, encrypted* and transmitted over a TCP link. </li></ul><li>Where would I use it? </li><ul><li>Performing commands, opening tunnels with and transferring files with your remote hosts. </li></ul><li>What would I use? </li><ul><li>PuTTY, ssh, ConnectBot, SecureCRT </li></ul></ul>

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Example: Warning - SSH

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Example: Creating SSH Keys

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Example: SSH Port Forwarding Local: His port transferred to my system Local: His port transferred to my system Remote: My port transferred to his system

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Hide your Identity on the Internet <ul><li>Why would you want to hide your Identity? </li><ul><li>Breaching policy, joking with friends, whistleblowing </li></ul><li>What can you use to hide your identity? </li><ul><li>Anonymous proxies, tunnels, TOR and FreeNet. </li></ul><li>How can you trust these systems? </li><ul><li>Bottom line, you can't – completely. Seeing source code can give you confidence in your first connection. Combining this with technologies like SSL, SSH Keys and GPG can help you trust your destination is untampered. </li></ul></ul>

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Explaining Terms: Anonymous Proxy <ul><li>What is an Anonymous Proxy? </li><ul><li>An anonymous proxy is one which has been set up (inadvertantly or otherwise) to permit traffic from the Internet through it to another service. </li></ul><li>How do I use it? </li><ul><li>Find a list, configure your application to use that proxy. </li></ul><li>Is it trustworthy? </li><ul><li>Not really. It has been included for completeness. </li></ul></ul>

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Explaining Terms: Tunnels <ul><li>What is a Tunnel? </li><ul><li>Using something like SSH or a VPN, you can create tunnelled or encapsulated connections using the machine you've connected to, to create an onward connection. </li></ul><li>How do I use it? </li><ul><li>ssh -L localport:dstIP:dstport </li></ul><li>Is it trustworthy? </li><ul><li>Only if you control the server, but then you've just given away your identity... Hmmm. </li></ul></ul>

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Explaining Terms: TOR <ul><li>What is TOR? </li><ul><li>TOR is a system that hides your source address, then part or all of the route to the destination.

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TOR also provides “Hidden Services” within the TOR network, that never leave the TOR network. </li></ul><li>Where would I use it? </li><ul><li>Iraq, China, work, untrusted or mobile networks </li></ul><li>Is it trustworthy? </li><ul><li>Mostly, but there are some risks. </li></ul></ul>

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Explaining Terms: FreeNet <ul><li>What is FreeNet? </li><ul><li>FreeNet is an anonymous, P2P storage network that can also be used to tunnel data between known hosts </li></ul><li>Where would I use it? </li><ul><li>I have no idea – I only found out about it yesterday! </li></ul><li>Is it trustworthy? </li><ul><li>It looks like it. Your data is signed in the P2P cloud proving the author is consistent, and node-to-node connections are encrypted. </li></ul></ul>

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Any questions? (P.S. This doesn't mean I know the answers!) (P.P.S. I might need to take your details and get back to you later!) Send them to jon@spriggs.org.uk