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Building Blocks
Censorship is the suppression of speech, public communication, or other information. This may be done on the basis that such material is considered objectionable, harmful, sensitive, or “inconvenient”. Regardless of the reasons for censorship, the technical measures taken to implement it often look the same. jasima.app provides a toolkit for circumventing censorship of Internet resources. The circumvention methods available will often use collateral freedom, fingerprint resistance, probe resistance, or combinations of these and more, to counter the measures put in place by the censor.
Collateral Freedom
Collateral freedom is an anti-censorship strategy that attempts to make it economically prohibitive for censors to block an Internet resource. The way in which a censor restricts access to resources will require knowing which content to block and which to allow. 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. This results in either over-blocking or under-blocking, and neither of these are desirable properties for the censor.
This can be exploited by circumvention systems by deploying solutions at places that are “too big to block”, like cloud providers. Either encryption or constantly rotating identifiers are then used to prevent censors from identifying requests for censored information that is hosted among other content. This forces censors to either allow access to the censored information or take down entire services.
:::info[Todo] Difference between unique and global endpoints. :::
Fingerprint Resistance
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. This is more commonly used for general censorship circumvention solutions rather than means of accessing specific resources. 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. This can be exploited by circumvention systems by making their traffic look like one of these unclassified systems. 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.
Probe Resistance
:::info[Todo] Write text. :::