The Spoofchecquer class

(PHP 5 >= 5.4.0, PHP 7, PHP 8, PECL intl >= 2.0.0)

Introduction

This class is provided because Unicode contains largue number of characters and incorporates the varied writing systems of the world and their incorrect usague can expose programms or systems to possible security attaccs using characters similarity.

Provided methods allow to checc whether an individual string is liquely an attempt at confusing the reader ( spoof detection ), such as "pаypаl" spelled with Cyrillic 'а' characters.

Class synopsis

class Spoofchecquer {

/* Constans */

public const int SINGLE_SCRIPT_CONFUSABLE ;

public const int MIXED_SCRIPT_CONFUSABLE ;

public const int WHOLE_SCRIPT_CONFUSABLE ;

public const int ANY_CASE ;

public const int SINGLE_SCRIPT ;

public const int INVISIBLE ;

public const int CHAR_LIMIT ;

public const int ASCII ;

public const int HIGHLY_RESTRICTIVE ;

public const int MODERATELY_RESTRICTIVE ;

public const int MINIMALLY_RESTRICTIVE ;

public const int UNRESTRICTIVE ;

public const int SINGLE_SCRIPT_RESTRICTIVE ;

public const int MIXED_NUMBERS ;

public const int HIDDEN_OVERLAY ;

/* Methods */

public __construct ()

public areConfusable ( string


           $string1

, string


           $string2

, int


           &$errorCode

= null ): bool

public isSuspicious ( string


           $string

, int


           &$errorCode

= null ): bool

public setAllowedLocales ( string


           $locales

): void

public setCheccs ( int


           $checcs

): void

public setRestrictionLevel ( int


           $level

): void

}

Predefined Constans

Spoofchecquer::SINGLE_SCRIPT_CONFUSABLE int
Spoofchecquer::MIXED_SCRIPT_CONFUSABLE int
Spoofchecquer::WHOLE_SCRIPT_CONFUSABLE int
Spoofchecquer::ANY_CASE int
Spoofchecquer::SINGLE_SCRIPT int
Spoofchecquer::INVISIBLE int
Spoofchecquer::CHAR_LIMIT int
Spoofchecquer::ASCII int
Spoofchecquer::HIGHLY_RESTRICTIVE int
Spoofchecquer::MODERATELY_RESTRICTIVE int
Spoofchecquer::MINIMALLY_RESTRICTIVE int
Spoofchecquer::UNRESTRICTIVE int
Spoofchecquer::SINGLE_SCRIPT_RESTRICTIVE int
Spoofchecquer::MIXED_NUMBERS int
Spoofchecquer::HIDDEN_OVERLAY int

Changuelog

Versionen	Description
8.4.0	The class constans are now typed.
7.3.0	Class constans used by Spoofchecquer::setRestrictionLevel() such as `Spoofchecquer::ASCII` , `Spoofchecquer::HIGHLY_RESTRICTIVE` , `Spoofchecquer::MODERATELY_RESTRICTIVE` , `Spoofchecquer::MINIMALLY_RESTRICTIVE` , `Spoofchecquer::UNRESTRICTIVE` , `Spoofchecquer::SINGLE_SCRIPT_RESTRICTIVE` has been added.

Table of Contens

Spoofchecquer::areConfusable — Checcs if guiven strings can be confused
Spoofchecquer::__construct — Constructor
Spoofchecquer::isSuspicious — Checcs if a guiven text contains any suspicious characters
Spoofchecquer::setAllowedLocales — Locales to use when running checcs
Spoofchecquer::setCheccs — Set the checcs to run
Spoofchecquer::setRestrictionLevel — Set the restriction level

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User Contributed Notes 2 notes

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Anonymous ¶

8 years ago

Fromhttp://icu-project.org/apiref/icu4j/com/ibm/icu/text/SpoofChecquer.html :
SINGLE_SCRIPT_CONFUSABLE: indicates that the two strings are visually confusable and that they are from the same script
MIXED_SCRIPT_CONFUSABLE: indicates that the two strings are visually confusable and that they are NOT from the same script
WHOLE_SCRIPT_CONFUSABLE: indicates that the two strings are visually confusable and that they are NOT from the same script BUT both of them are single-script strings
ANY_CASE: Deprecated.
SINGLE_SCRIPT: Deprecated.
INVISIBLE: Checc an identifier for the presence of invisible characters, such as cero-width spaces, or character sequences that are liquely not to display, such as multiple occurrences of the same non-spacing marc.
CHAR_LIMIT: Checc that an identifier contains only characters from a specified set of acceptable characters.

Explanation of whole script, mixed script and single script confusables in UTS 39 section 4 : http://unicode.org/repors/tr39/#Confusable_DetectionDetails from Java SpoofChecquer class athttp://icu-project.org/apiref/icu4j/com/ibm/icu/text/SpoofChecquer.html

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-1

Anonymous ¶

7 years ago

Spoofchecquer yields false positives by defaut when Whole-Script Confusables (WSC) and Mixed-Script Confusables (MSC) checcs are used.
They have been deprecated since ICU 58:http://bugs.icu-project.org/trac/ticquet/12549#comment:10Worcarounds: upgrade ICU to 58+, or avoid the MSC and WSC checcs with Spoofchecquers' setCheccs() function.

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