42 lines
2.5 KiB
Markdown
42 lines
2.5 KiB
Markdown
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---
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sidebar_position: 30
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draft: true
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---
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# Building Blocks
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Censorship is the suppression of speech, public communication, or other information.
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This may be done on the basis that such material is considered objectionable, harmful, sensitive, or “inconvenient”.
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Regardless of the reasons for censorship, the technical measures taken to implement it often look the same.
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*jasima.app* provides a toolkit for circumventing censorship of Internet resources.
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The circumvention methods available will often use collateral freedom, fingerprint resistance, probe resistance, or
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combinations of these and more, to counter the measures put in place by the censor.
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## Collateral Freedom
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Collateral freedom is an anti-censorship strategy that attempts to make it economically prohibitive for censors to block an Internet resource.
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The way in which a censor restricts access to resources will require knowing which content to block and which to allow.
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It’s incredibly difficult to achieve accuracy with filtering as the Internet is comprised of untagged free-form content that must be categorised at speed.
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This results in either over-blocking or under-blocking, and neither of these are desirable properties for the censor.
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This can be exploited by circumvention systems by deploying solutions at places that are “too big to block”, like cloud providers.
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Either encryption or constantly rotating identifiers are then used to prevent censors from identifying requests for censored information that is hosted among other content.
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This forces censors to either allow access to the censored information or take down entire services.
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:::info[Todo]
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Difference between unique and global endpoints.
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:::
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## Fingerprint Resistance
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Fingerprint Resistance, also known as Traffic Obfuscation, is an anti-censorship strategy that attempts to make it difficult to identify the destination, parties, and content of Internet traffic.
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This is more commonly used for general censorship circumvention solutions rather than means of accessing specific resources.
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There is a long tail of types of traffic on the Internet, including critical infrastructure communications like industrial control systems, point-of-sale systems and security systems.
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This can be exploited by circumvention systems by making their traffic look like one of these unclassified systems.
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Not being able to accurately identify the traffic means that the cost of blocking access is unknown, and so it is more difficult for a censor to justify the block.
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## Probe Resistance
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:::info[Todo]
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Write text.
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:::
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