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Tidy links, and lint (#2435)
Tidies up a number of things: - Outdated links that redirect - Dead links - Remove unnecessary parameters eg "en" and "en-US" - Shortened amazon, apps.apple.com, reddit links - Removed trailing / - Remove www (except for PG assets) - Optimize unoptimized SVGs and remove xml declarations - Lint yaml, md files Co-Authored-By: Daniel Gray <dngray@privacyguides.org>
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@ -28,7 +28,7 @@ Some self-hosted messengers allow you to set up your own server. Self-hosting ca
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- Can include [restricted control or access](https://drewdevault.com/2018/08/08/Signal.html). This can include things like:
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- Being [forbidden from connecting third-party clients](https://github.com/LibreSignal/LibreSignal/issues/37#issuecomment-217211165) to the centralized network that might provide for greater customization or a better experience. Often defined in Terms and Conditions of usage.
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- Poor or no documentation for third-party developers.
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- The [ownership](https://web.archive.org/web/20210729191953/https://blog.privacytools.io/delisting-wire/), privacy policy, and operations of the service can change easily when a single entity controls it, potentially compromising the service later on.
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- The [ownership](https://web.archive.org/web/20210729191953/https://blog.privacytools.io/delisting-wire), privacy policy, and operations of the service can change easily when a single entity controls it, potentially compromising the service later on.
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- Self-hosting requires effort and knowledge of how to set up a service.
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## Federated Networks
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@ -60,7 +60,7 @@ When self-hosted, members of a federated server can discover and communicate wit
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P2P messengers connect to a [distributed network](https://en.wikipedia.org/wiki/Distributed_networking) of nodes to relay a message to the recipient without a third-party server.
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Clients (peers) usually find each other through the use of a [distributed computing](https://en.wikipedia.org/wiki/Distributed_computing) network. Examples of this include [Distributed Hash Tables](https://en.wikipedia.org/wiki/Distributed_hash_table) (DHT), used by [torrents](https://en.wikipedia.org/wiki/BitTorrent_(protocol)) and [IPFS](https://en.wikipedia.org/wiki/InterPlanetary_File_System) for example. Another approach is proximity based networks, where a connection is established over WiFi or Bluetooth (for example, Briar or the [Scuttlebutt](https://www.scuttlebutt.nz) social network protocol).
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Clients (peers) usually find each other through the use of a [distributed computing](https://en.wikipedia.org/wiki/Distributed_computing) network. Examples of this include [Distributed Hash Tables](https://en.wikipedia.org/wiki/Distributed_hash_table) (DHT), used by [torrents](https://en.wikipedia.org/wiki/BitTorrent_(protocol)) and [IPFS](https://en.wikipedia.org/wiki/InterPlanetary_File_System) for example. Another approach is proximity based networks, where a connection is established over WiFi or Bluetooth (for example, Briar or the [Scuttlebutt](https://scuttlebutt.nz) social network protocol).
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Once a peer has found a route to its contact via any of these methods, a direct connection between them is made. Although messages are usually encrypted, an observer can still deduce the location and identity of the sender and recipient.
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@ -18,7 +18,7 @@ Below, we discuss and provide a tutorial to prove what an outside observer may s
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### Unencrypted DNS
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1. Using [`tshark`](https://www.wireshark.org/docs/man-pages/tshark.html) (part of the [Wireshark](https://en.wikipedia.org/wiki/Wireshark) project) we can monitor and record internet packet flow. This command records packets that meet the rules specified:
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1. Using [`tshark`](https://wireshark.org/docs/man-pages/tshark.html) (part of the [Wireshark](https://en.wikipedia.org/wiki/Wireshark) project) we can monitor and record internet packet flow. This command records packets that meet the rules specified:
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```bash
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tshark -w /tmp/dns.pcap udp port 53 and host 1.1.1.1 or host 8.8.8.8
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@ -39,7 +39,7 @@ Below, we discuss and provide a tutorial to prove what an outside observer may s
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nslookup privacyguides.org 8.8.8.8
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```
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3. Next, we want to [analyse](https://www.wireshark.org/docs/wsug_html_chunked/ChapterIntroduction.html#ChIntroWhatIs) the results:
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3. Next, we want to [analyse](https://wireshark.org/docs/wsug_html_chunked/ChapterIntroduction.html#ChIntroWhatIs) the results:
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=== "Wireshark"
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@ -74,7 +74,7 @@ Encrypted DNS can refer to one of a number of protocols, the most common ones be
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### DNS over TLS (DoT)
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[**DNS over TLS**](https://en.wikipedia.org/wiki/DNS_over_TLS) is another method for encrypting DNS communication that is defined in [RFC 7858](https://datatracker.ietf.org/doc/html/rfc7858). Support was first implemented in Android 9, iOS 14, and on Linux in [systemd-resolved](https://www.freedesktop.org/software/systemd/man/resolved.conf.html#DNSOverTLS=) in version 237. Preference in the industry has been moving away from DoT to DoH in recent years, as DoT is a [complex protocol](https://dnscrypt.info/faq/) and has varying compliance to the RFC across the implementations that exist. DoT also operates on a dedicated port 853 which can be blocked easily by restrictive firewalls.
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[**DNS over TLS**](https://en.wikipedia.org/wiki/DNS_over_TLS) is another method for encrypting DNS communication that is defined in [RFC 7858](https://datatracker.ietf.org/doc/html/rfc7858). Support was first implemented in Android 9, iOS 14, and on Linux in [systemd-resolved](https://freedesktop.org/software/systemd/man/resolved.conf.html#DNSOverTLS=) in version 237. Preference in the industry has been moving away from DoT to DoH in recent years, as DoT is a [complex protocol](https://dnscrypt.info/faq) and has varying compliance to the RFC across the implementations that exist. DoT also operates on a dedicated port 853 which can be blocked easily by restrictive firewalls.
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### DNS over HTTPS (DoH)
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@ -106,7 +106,7 @@ In this example we will record what happens when we make a DoH request:
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wireshark -r /tmp/dns_doh.pcap
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```
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We can see the [connection establishment](https://en.wikipedia.org/wiki/Transmission_Control_Protocol#Connection_establishment) and [TLS handshake](https://www.cloudflare.com/learning/ssl/what-happens-in-a-tls-handshake/) that occurs with any encrypted connection. When looking at the "application data" packets that follow, none of them contain the domain we requested or the IP address returned.
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We can see the [connection establishment](https://en.wikipedia.org/wiki/Transmission_Control_Protocol#Connection_establishment) and [TLS handshake](https://cloudflare.com/learning/ssl/what-happens-in-a-tls-handshake) that occurs with any encrypted connection. When looking at the "application data" packets that follow, none of them contain the domain we requested or the IP address returned.
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## Why **shouldn't** I use encrypted DNS?
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@ -158,9 +158,9 @@ Server Name Indication is typically used when a IP address hosts many websites.
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tshark -r /tmp/pg.pcap -Tfields -Y tls.handshake.extensions_server_name -e tls.handshake.extensions_server_name
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```
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This means even if we are using "Encrypted DNS" servers, the domain will likely be disclosed through SNI. The [TLS v1.3](https://en.wikipedia.org/wiki/Transport_Layer_Security#TLS_1.3) protocol brings with it [Encrypted Client Hello](https://blog.cloudflare.com/encrypted-client-hello/), which prevents this kind of leak.
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This means even if we are using "Encrypted DNS" servers, the domain will likely be disclosed through SNI. The [TLS v1.3](https://en.wikipedia.org/wiki/Transport_Layer_Security#TLS_1.3) protocol brings with it [Encrypted Client Hello](https://blog.cloudflare.com/encrypted-client-hello), which prevents this kind of leak.
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Governments, in particular [China](https://www.zdnet.com/article/china-is-now-blocking-all-encrypted-https-traffic-using-tls-1-3-and-esni/) and [Russia](https://www.zdnet.com/article/russia-wants-to-ban-the-use-of-secure-protocols-such-as-tls-1-3-doh-dot-esni/), have either already [started blocking](https://en.wikipedia.org/wiki/Server_Name_Indication#Encrypted_Client_Hello) it or expressed a desire to do so. Recently, Russia has [started blocking foreign websites](https://github.com/net4people/bbs/issues/108) that use the [HTTP/3](https://en.wikipedia.org/wiki/HTTP/3) standard. This is because the [QUIC](https://en.wikipedia.org/wiki/QUIC) protocol that is a part of HTTP/3 requires that `ClientHello` also be encrypted.
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Governments, in particular [China](https://zdnet.com/article/china-is-now-blocking-all-encrypted-https-traffic-using-tls-1-3-and-esni) and [Russia](https://zdnet.com/article/russia-wants-to-ban-the-use-of-secure-protocols-such-as-tls-1-3-doh-dot-esni), have either already [started blocking](https://en.wikipedia.org/wiki/Server_Name_Indication#Encrypted_Client_Hello) it or expressed a desire to do so. Recently, Russia has [started blocking foreign websites](https://github.com/net4people/bbs/issues/108) that use the [HTTP/3](https://en.wikipedia.org/wiki/HTTP/3) standard. This is because the [QUIC](https://en.wikipedia.org/wiki/QUIC) protocol that is a part of HTTP/3 requires that `ClientHello` also be encrypted.
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### Online Certificate Status Protocol (OCSP)
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@ -290,7 +290,7 @@ The DNSSEC signing process is similar to someone signing a legal document with a
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DNSSEC implements a hierarchical digital signing policy across all layers of DNS. For example, in the case of a `privacyguides.org` lookup, a root DNS server would sign a key for the `.org` nameserver, and the `.org` nameserver would then sign a key for `privacyguides.org`’s authoritative nameserver.
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<small>Adapted from [DNS Security Extensions (DNSSEC) overview](https://cloud.google.com/dns/docs/dnssec) by Google and [DNSSEC: An Introduction](https://blog.cloudflare.com/dnssec-an-introduction/) by Cloudflare, both licensed under [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/).</small>
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<small>Adapted from [DNS Security Extensions (DNSSEC) overview](https://cloud.google.com/dns/docs/dnssec) by Google and [DNSSEC: An Introduction](https://blog.cloudflare.com/dnssec-an-introduction) by Cloudflare, both licensed under [CC BY 4.0](https://creativecommons.org/licenses/by/4.0).</small>
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## What is QNAME minimization?
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@ -8,7 +8,7 @@ There's a reason data about your buying habits is considered the holy grail of a
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For centuries, **cash** has functioned as the primary form of private payment. Cash has excellent privacy properties in most cases, is widely accepted in most countries, and is **fungible**, meaning it is non-unique and completely interchangable.
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Cash payment laws vary by country. In the United States, special disclosure is required for cash payments over $10,000 to the IRS on [Form 8300](https://www.irs.gov/businesses/small-businesses-self-employed/form-8300-and-reporting-cash-payments-of-over-10000). The receiving business is required to ID verify the payee’s name, address, occupation, date of birth, and Social Security Number or other TIN (with some exceptions). Lower limits without ID such as $3,000 or less exist for exchanges and money transmission. Cash also contains serial numbers. These are almost never tracked by merchants, but they can be used by law enforcement in targeted investigations.
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Cash payment laws vary by country. In the United States, special disclosure is required for cash payments over $10,000 to the IRS on [Form 8300](https://irs.gov/businesses/small-businesses-self-employed/form-8300-and-reporting-cash-payments-of-over-10000). The receiving business is required to ID verify the payee’s name, address, occupation, date of birth, and Social Security Number or other TIN (with some exceptions). Lower limits without ID such as $3,000 or less exist for exchanges and money transmission. Cash also contains serial numbers. These are almost never tracked by merchants, but they can be used by law enforcement in targeted investigations.
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Despite this, it’s typically the best option.
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- [Recommended Cryptocurrency :material-arrow-right-drop-circle:](../cryptocurrency.md#coins)
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Privacy coins have been subject to increasing scrutiny by government agencies. In 2020, [the IRS published a $625,000 bounty](https://www.forbes.com/sites/kellyphillipserb/2020/09/14/irs-will-pay-up-to-625000-if-you-can-crack-monero-other-privacy-coins/?sh=2e9808a085cc) for tools which can break Bitcoin Lightning Network and/or Monero's transaction privacy. They ultimately [paid two companies](https://sam.gov/opp/5ab94eae1a8d422e88945b64181c6018/view) (Chainalysis and Integra Fec) a combined $1.25 million for tools which purport to do so (it is unknown which cryptocurrency network these tools target). Due to the secrecy surrounding tools like these, ==none of these methods of tracing cryptocurrencies have been independently confirmed.== However, it is quite likely that tools which assist targeted investigations into private coin transactions exist, and that privacy coins only succeed in thwarting mass surveillance.
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Privacy coins have been subject to increasing scrutiny by government agencies. In 2020, [the IRS published a $625,000 bounty](https://forbes.com/sites/kellyphillipserb/2020/09/14/irs-will-pay-up-to-625000-if-you-can-crack-monero-other-privacy-coins/?sh=2e9808a085cc) for tools which can break Bitcoin Lightning Network and/or Monero's transaction privacy. They ultimately [paid two companies](https://sam.gov/opp/5ab94eae1a8d422e88945b64181c6018/view) (Chainalysis and Integra Fec) a combined $1.25 million for tools which purport to do so (it is unknown which cryptocurrency network these tools target). Due to the secrecy surrounding tools like these, ==none of these methods of tracing cryptocurrencies have been independently confirmed.== However, it is quite likely that tools which assist targeted investigations into private coin transactions exist, and that privacy coins only succeed in thwarting mass surveillance.
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### Other Coins (Bitcoin, Ethereum, etc.)
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### Acquisition
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Acquiring [cryptocurrencies](../cryptocurrency.md) like Monero privately can be difficult. P2P marketplaces like [LocalMonero](https://localmonero.co/), a platform which facilitates trades between people, are one option that can be used. If using an exchange which requires KYC is an acceptable risk for you as long as subsequent transactions can't be traced, a much easier option is to purchase Monero on an exchange like [Kraken](https://kraken.com/), or purchase Bitcoin/Litecoin from a KYC exchange which can then be swapped for Monero. Then, you can withdraw the purchased Monero to your own noncustodial wallet to use privately from that point forward.
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Acquiring [cryptocurrencies](../cryptocurrency.md) like Monero privately can be difficult. P2P marketplaces like [LocalMonero](https://localmonero.co), a platform which facilitates trades between people, are one option that can be used. If using an exchange which requires KYC is an acceptable risk for you as long as subsequent transactions can't be traced, a much easier option is to purchase Monero on an exchange like [Kraken](https://kraken.com), or purchase Bitcoin/Litecoin from a KYC exchange which can then be swapped for Monero. Then, you can withdraw the purchased Monero to your own noncustodial wallet to use privately from that point forward.
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If you go this route, make sure to purchase Monero at different times and in different amounts than where you will spend it. If you purchase $5000 of Monero at an exchange and make a $5000 purchase in Monero an hour later, those actions could potentially be correlated by an outside observer regardless of which path the Monero took. Staggering purchases and purchasing larger amounts of Monero in advance to later spend on multiple smaller transactions can avoid this pitfall.
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Because we already [generally recommend](../basics/vpn-overview.md) that the vast majority of people use a trusted VPN provider for a variety of reasons, the following recommendation about connecting to Tor via a VPN likely applies to you. <mark>There is no need to disable your VPN before connecting to Tor</mark>, as some online resources would lead you to believe.
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Connecting directly to Tor will make your connection stand out to any local network administrators or your ISP. Detecting and correlating this traffic [has been done](https://edition.cnn.com/2013/12/17/justice/massachusetts-harvard-hoax/) in the past by network administrators to identify and deanonymize specific Tor users on their network. On the other hand, connecting to a VPN is almost always less suspicious, because commercial VPN providers are used by everyday consumers for a variety of mundane tasks like bypassing geo-restrictions, even in countries with heavy internet restrictions.
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Connecting directly to Tor will make your connection stand out to any local network administrators or your ISP. Detecting and correlating this traffic [has been done](https://edition.cnn.com/2013/12/17/justice/massachusetts-harvard-hoax) in the past by network administrators to identify and deanonymize specific Tor users on their network. On the other hand, connecting to a VPN is almost always less suspicious, because commercial VPN providers are used by everyday consumers for a variety of mundane tasks like bypassing geo-restrictions, even in countries with heavy internet restrictions.
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Therefore, you should make an effort to hide your IP address **before** connecting to the Tor network. You can do this by simply connecting to a VPN (through a client installed on your computer) and then accessing [Tor](../tor.md) as normal, through Tor Browser for example. This creates a connection chain like:
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### Tor usage is not undetectable
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**Even if you use bridges and pluggable transports,** the Tor Project provides no tools to hide the fact that you are using Tor from your ISP. Even using obfuscated "pluggable transports" or non-public bridges do not hide the fact that you are using a private communications channel. The most popular pluggable transports like obfs4 (which obfuscates your traffic to "look like nothing") and meek (which uses domain fronting to camouflage your traffic) can be [detected](https://www.hackerfactor.com/blog/index.php?/archives/889-Tor-0day-Burning-Bridges.html) with fairly standard traffic analysis techniques. Snowflake has similar issues, and can be [easily detected](https://www.hackerfactor.com/blog/index.php?/archives/944-Tor-0day-Snowflake.html) *before* a Tor connection is even established.
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**Even if you use bridges and pluggable transports,** the Tor Project provides no tools to hide the fact that you are using Tor from your ISP. Even using obfuscated "pluggable transports" or non-public bridges do not hide the fact that you are using a private communications channel. The most popular pluggable transports like obfs4 (which obfuscates your traffic to "look like nothing") and meek (which uses domain fronting to camouflage your traffic) can be [detected](https://hackerfactor.com/blog/index.php?/archives/889-Tor-0day-Burning-Bridges.html) with fairly standard traffic analysis techniques. Snowflake has similar issues, and can be [easily detected](https://hackerfactor.com/blog/index.php?/archives/944-Tor-0day-Snowflake.html) *before* a Tor connection is even established.
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Pluggable transports other than these three do exist, but typically rely on security through obscurity to evade detection. They aren't impossible to detect, they are just used by so few people that it's not worth the effort building detectors for them. They shouldn't be relied upon if you specifically are being monitored.
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Unlike the other nodes, the Tor client will randomly select an entry node and stick with it for two to three months to protect you from certain attacks.[^1]
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[^1]: The first relay in your circuit is called an "entry guard" or "guard". It is a fast and stable relay that remains the first one in your circuit for 2-3 months in order to protect against a known anonymity-breaking attack. The rest of your circuit changes with every new website you visit, and all together these relays provide the full privacy protections of Tor. For more information on how guard relays work, see this [blog post](https://blog.torproject.org/improving-tors-anonymity-changing-guard-parameters) and [paper](https://www-users.cs.umn.edu/~hoppernj/single_guard.pdf) on entry guards. ([https://support.torproject.org/tbb/tbb-2/](https://support.torproject.org/tbb/tbb-2/))
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[^1]: The first relay in your circuit is called an "entry guard" or "guard". It is a fast and stable relay that remains the first one in your circuit for 2-3 months in order to protect against a known anonymity-breaking attack. The rest of your circuit changes with every new website you visit, and all together these relays provide the full privacy protections of Tor. For more information on how guard relays work, see this [blog post](https://blog.torproject.org/improving-tors-anonymity-changing-guard-parameters) and [paper](https://www-users.cs.umn.edu/~hoppernj/single_guard.pdf) on entry guards. ([https://support.torproject.org/tbb/tbb-2/](https://support.torproject.org/tbb/tbb-2))
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### The Middle Node
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