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Kegan Dougal 2014-09-09 15:00:48 -07:00
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docs/human-id-rules.rst
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@ -7,23 +7,23 @@ such, Matrix requires that all strings MUST be encoded as UTF-8. However,
using Unicode as the character set for human-readable IDs is troublesome. There using Unicode as the character set for human-readable IDs is troublesome. There
are many different characters which appear identical to each other, but would are many different characters which appear identical to each other, but would
identify different users. In addition, there are non-printable characters which identify different users. In addition, there are non-printable characters which
cannot be rendered the the end-user. This opens up a security vulnerability with cannot be rendered by the end-user. This opens up a security vulnerability with
phishing/spoofing of IDs, commonly known as a homograph attack. phishing/spoofing of IDs, commonly known as a homograph attack.
Web browers encountered this problem when International Domain Names were Web browers encountered this problem when International Domain Names were
introduced. A variety of checks were put in place in order to protect users. If introduced. A variety of checks were put in place in order to protect users. If
an address failed the check, the raw punycode would be displayed to disambiguate an address failed the check, the raw punycode would be displayed to disambiguate
the address. Similar checks are performed by home servers in Matrix, which will the address. Similar checks are performed by home servers in Matrix. However,
then warn the client about the potentially misleading ID. However, Matrix does Matrix does not use punycode representations, and so does not show raw punycode
not use punycode, and so does not show raw punycode on a failed check. Instead, on a failed check. Instead, home servers must outright reject these misleading
home servers must outright reject these misleading IDs. IDs.
Types of human-readable IDs Types of human-readable IDs
--------------------------- ---------------------------
There are two main human-readable IDs in question: There are two main human-readable IDs in question:
- Room aliases - Room aliases
- User IDs - User IDs
Room aliases look like ``#localpart:domain``. These aliases point to opaque Room aliases look like ``#localpart:domain``. These aliases point to opaque
non human-readable room IDs. These pointers can change, so there is already an non human-readable room IDs. These pointers can change, so there is already an