Property talk:P3721

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public key fingerprint
short sequence of bytes to identify a longer cryptographic public key

Description	short sequence of bytes to identify a longer cryptographic public key
Represents	public key fingerprint (Q6578920)
Data type	String
Allowed values	[0-9A-Fa-f -]{8,}
Example	Linus Torvalds (Q34253) → ABAF 11C6 5A29 70B1 30AB E3C4 79BE 3E43 0041 1886 Greg Kroah-Hartman (Q93084) → 647F 2865 4894 E3BD 4571 99BE 38DB BDC8 6092 693E
Lists	Items with the most statements of this property Count of items by number of statements (chart) Items with the most statements Items with the fewest statements Count of items by number of sitelinks (chart) Items with the most sitelinks Items with the most sitelinks, but no link to one Wikipedia (sample: Welsh Wikipedia, cywiki) Items with the fewest sitelinks Most linked wikis Items with the most identifier properties Items with no other statements Most recently created items Items with novalue claims Items with unknown value claims Usage history (total) Usage history (main statement) Chart by item creation date Database reports/Constraint violations/P3721 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 359 Main statement 356 99.2% of uses Qualifier 2 0.6% of uses Reference 1 0.3% of uses
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[create Create a translatable help page (preferably in English) for this property to be included here]

Format “[0-9A-Fa-f -]{8,}”: value must be formatted using this pattern (PCRE syntax). (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P3721#Format, SPARQL

Qualifiers “start time (P580), end time (P582), determination method (P459), reason for deprecated rank (P2241), title (P1476), reason for preferred rank (P7452), end cause (P1534), has use (P366), earliest date (P1319), latest start date (P8555), earliest end date (P8554), latest date (P1326), email address (P968), data size (P3575)”: this property should be used only with the listed qualifiers. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P3721#allowed qualifiers, SPARQL

Allowed entity types are Wikibase item (Q29934200): the property may only be used on a certain entity type (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P3721#Entity types

Scope is as main value (Q54828448): the property must be used by specified way only (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P3721#Scope, SPARQL

Citation needed: the property must have at least one reference (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P3721#citation needed

Determination Method

I've moved determination method (P459) from the mandatory qualifiers to the allowed ones. I couldn't fingure out what it wants from me, and neither could the people who entered 220 of the existing 260 uses of this property. Feel free to reinstate it after you have added values to the examples. I've also addded has use (P366) to the allowed qualifiers because it's used a bunch makes sense. There are also some uses as qualifiers on email address (P968), or with it as a qualifier. This seems to make sense as well, but I hesitate because the change is somewhat more involved, and because the coupling of a key to an e-mail adress isn't inherent in the system as far as I know, but only common practice. --Matthias Winkelmann (talk) 13:46, 1 November 2020 (UTC)

@Matthias Winkelmann: determination method (P459) is used to provide the data about the procedure that was taken to get the fingerprint. ie. determination method (P459) = OpenPGP (Q2141493), then the data would be about that somebody associates a public key fingerprint with the OpenPGP standard. Maybe one could even have multiple values for determination method. ie. both OpenPGP and the software used to determine the fingerprint, but so far I've only tried with the OpenPGP determination method. I've added the qualifier in the allowed space for email email address (P968). Not necessary but this is data that is found by using the OpenPGP standard and also it can be useful data because sometimes developers add their email address to the user ID and then also add the same exact data to their email. Why some data shouldn't be included, I don't know why that would be unless we consider that email might be considered sensitive data. Email might be considered information that might get picked up by spambots, so there is a risk to privacy. If the community decides we do not add email data, then we'll just stop adding more email data, possibly remove existing email data related to the email property that was added. Oduci (talk) 16:03, 6 November 2021 (UTC)

allowed qualifiers constraint (Q21510851) = data size (P3575) - Public keys may vary in size, even concerning the same key

I'm adding another allowed qualifiers constraint (Q21510851) because of data size concerning public keys which may vary, even if its the same key. Sometimes key providers share a larger version of the key they provide as the extra data size may account for other signatory parties which have signed the key to cryptographically prove that they in public approve of the key being distributed to some degree. Even for the same key this value may change as more signatures are added but also if subkeys have expired or new subkeys have been added. Many reasons can affect a key in which way the key size will change. Oduci (talk) 21:01, 24 November 2021 (UTC)