Data encryption/sl

Uvod

Šifriranje podatkov je nova funkcija, ki je na voljo v LimeSurvey 4. Ustvarjena je bila za pomoč skrbnikom anket pri boljšem soočanju z novimi predpisi o varstvu podatkov, sprejetimi v različnih delih sveta (npr. GDPR).

Ta funkcija omogoča šifriranje osebnih podatkov, ki se nahajajo v osrednji podatkovni bazi udeležencev in/ali tabeli udeležencev ankete. Poleg tega lahko tudi šifrirate podatke, ki jih zberete od anketirancev, če je omogočen atribut vprašanja za šifriranje.

Upoštevajte, da bodo vaši podatki vedno vidni v vmesniku LimeSurvey. Šifrirani so samo vnosi v bazo podatkov - nihče, ki dostopa do strežnika, kjer gostite LimeSurvey, ne more vizualizirati ustreznih podatkov. Zato bodite pozorni, komu dajete globalna in anketna dovoljenja.

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Kdaj šifrirati svoje podatke?

Na to vprašanje ni enega pravilnega odgovora. Močno je odvisno od:

• vrsta podatkov, ki jih zbirate
• če vaša anketa temelji na
• nacionalni ali zvezni zakonodaji

Največkrat je pomembno šifrirati podatke, ki omogočajo osebno identifikacijo (npr. kot priporoča Splošna uredba o varstvu podatkov). Zato se lahko polja, kot so ime, priimek, e-poštni naslov, telefonska številka, naslov itd., uporabijo za prepoznavanje odgovorov, ki jih je poslala ena oseba.

V drugih primerih se podatki, ki jih je treba šifrirati, ne končajo nujno pri zgoraj navedenih primerih. V določenih scenarijih (npr. pri medicinskih raziskavah) boste morda morali šifrirati večino svojih podatkov, če lahko sledite odgovorom osebe, ki jih je poslala.

Zato vas prosimo, da svojo anketo in zbiranje podatkov prilagodite lokalni zakonodaji!

Nastavitve

V LimeSurvey lahko nastavite nastavitve šifriranja podatkov na treh mestih:

• atributi vprašanja
• atributi udeleženca
• atributi baze osrednjih udeležencev.

Atributi vprašanja

Atribut vprašanja "Encrypted" se uporablja za omogočanje šifriranja podatkov za ustrezne odgovore. Ta atribut je privzeto izklopljen. Ko je anketa aktivirana, tega atributa ni več mogoče spremeniti.

Atributi udeležencev

Trije osnovni atributi (ime, priimek in e-pošta) so vedno prikazani v tabeli udeležencev ankete, pri čemer je šifriranje privzeto vklopljeno .

Vsak nov atribut udeleženca bo imel šifriranje izklopljeno privzeto.

Šifriranje lahko vklopite ali izklopite kadar koli.

Central participant database attribute management

Three core attributes (firstname, lastname and email) are always shown in the central participant database, the encryption being turned on by default.

Each new participant attribute will have encryption turned off by default.

Encryption can be turned on or off at any moment.

Advanced

Sodium library is used to provide data encryption and decryption functionality for LimeSurvey.

Sodium is a modern, easy-to-use software library for encryption, decryption, signatures, password hashing and more. It is a portable, cross-compilable, installable, packageable fork of NaCl, with a compatible API, and an extended API to improve usability even further. Its goal is to provide all of the core operations needed to build higher-level cryptographic tools.

Sodium is cross-platforms and cross-languages. It runs on a variety of compilers and operating systems, including Windows (with MinGW or Visual Studio, x86 and x86_64), iOS and Android. Javascript and WebAssembly versions are also available and are fully supported. Bindings for all common programming languages are available and well-supported.

Version 7.2.0 and newer of the PHP programming language includes the Sodium extension (referred to as ext/sodium) as a core cryptography library. Version 2 of the PHP extension in PECL is compatible with ext/sodium in PHP 7.2.

LimeSurvey uses the Sodium Compat library to bridge with different PHP versions. This library tentatively supports PHP 5.2.4 - 7.x (latest), but officially it only supports non-EOL'd versions of PHP.

Data encryption/decryption methods used in LimeSurvey are based on public-key signatures. Public and secret keys can be found in /application/config/security.php file. Keys are automatically generated on first usage of encryption feature.

  Once data encryption is turned on, data in corresponding database columns would become unreadable without decrypting them first. You should always have a backup of your encryption keys in case they get deleted. Also, once encryption keys are set, you should never change them because it would make all existing data unusable.

Partial string search won't be possible for database columns with encrypted data, only exact match search.

Errors

Possible errors when using data encryption:

• library doesn't exists: PHP Sodium library have to be installed to be able to use data encryption feature. Here is a guide on how to install library: Sodium installation. If you don't want to use data encryption, you have to disable encryption in attribute settings.
• wrong decryption key: decryption key has changed since data was last saved, so data can't be decrypted. The only way to decrypt data is to retrieve the original key from backup and replace the current decryption key with the original key.

Note: if the wrong decryption key error happens only when LimeSurvey sends an email (e.g. when you concluded a survey), go in Configuration > Global Settings > E-mail settings, and re-insert your STMP password and press Save.

Otherwise, you can still try to compare and eventually recover your decryption keys from a backup (since you do backups... isn't it? Uh?).