Waɗanne nau’ikan kalmar sirri ta PDF guda biyu ne akwai?
Fayilolin PDF suna tallafin kalmomin sirri daban-daban guda biyu. User password (kalmar sirri ta buɗewa) yana hana kowa buɗe fayil ɗin gaba ɗaya. In babu shi, abun cikin yana nan a ɓoye. Owner password (kalmar sirri ta izini) tana ba mutane damar ganin fayil ɗin amma tana saka hani akan wasu ayyuka kamar bugawa, kwafin rubutu, ko gyarawa.
Kuna iya saka dukkan kalmomin sirrin biyu akan fayil guda. Misali, manaja na iya saka user password akan bayanan albashi sannan ya saka owner password don hana bugawa.
Matakan ɓoyewa: AES-128 akasin AES-256
Dabarar ɓoyewa ce ke tantance yadda kalmar sirrin ku take da tsaro. AES-256 yana da ninki 2^128 na yiwuwar kalmomin sirri fiye da AES-128 - wanda yake da girma sosai. Ga fa’idodin kowane mataki:
| Fasali | AES-128 | AES-256 |
|---|---|---|
| Tsawon kewayawa | 128-bit | 256-bit |
| Matakin tsaro | Mai ƙarfi | Matakin soja |
| Juriyar binciken ƙarfi | ~2^128 ƙoƙari | ~2^256 ƙoƙari |
| Saurin sarrafawa | Da ɗan sauri | Da ɗan hankali |
| Tallafin mai karanta PDF | Acrobat 7+ (2005) | Acrobat X+ (2010) |
| Mafi kyawun amfani | Takardun ciki, draft | Shari’a, asibiti, bayanan kuɗi |
AES-256 shine daidaitaccen tsarin da bankuna da hukumomin gwamnati ke amfani dashi a halin yanzu. Zaɓi AES-128 ne kawai idan kuna buƙatar dacewa da tsofaffin masu karanta PDF na kafin 2010.
Waɗanne izini zaku iya sarrafawa da Owner Password?
Owner password yana ba ku damar sarrafa abinda mai karɓa zai iya yi da fayil ɗin ku:
- Bugawa - Hana bugawa gaba ɗaya ko bada izinin ƙananan inganci kawai
- Canza takarda - Hana saka shafuka, juya su ko cika fom
- Kwafin abun ciki - Hana mutane zaɓar rubutu ko hotuna don kwafa
- Bayanan kula - Sarrafa ko wasu za su iya ƙara bayanan kula ko sa hannu