Tia Sahihi ya Kidijitali kwenye PDF
Ongeza sahihi halisi ya kriptografia inayothibitisha nani alisaini na kwamba haijabadilishwa tangu wakati huo — si picha tu ya sahihi.
Jinsi inavyofanya kazi
Pakia PDF yako, kisha tengeneza sahihi ya bure papo hapo au pakia cheti (.pfx/.p12) ulichokwisha kuwa nacho. Pakua matokeo — PDF sasa ina sahihi halisi ya kidijitali ambayo programu yoyote ya kusoma PDF inaweza kuithibitisha.
Hii inatofautiana vipi na Jaza na Tia Sahihi?
Jaza na Tia Sahihi inaweka picha ya sahihi yako kwenye ukurasa — inaonekana sahihi, lakini hakuna kinachozuia mtu kuhariri faili baadaye bila wewe kujua. Zana hii inaweka sahihi halisi ya kriptografia: programu yoyote ya kusoma PDF inaweza kuithibitisha na itaonyesha tahadhari ikiwa hata herufi moja itabadilika baada ya kusaini.
Kuna tofauti gani kati ya chaguo mbili za kusaini?
"Tengeneza sahihi ya bure" inatengeneza cheti papo hapo, kikiunganishwa na jina na barua pepe unayoweka — kinathibitisha kwamba faili haikubadilishwa baada ya kusaini, lakini kwa kuwa hakuna mamlaka ya vyeti inayothibitisha utambulisho wako, programu za kusoma PDF zinaonyesha kama isiyothibitishwa hadi mtu achague kuiamini. "Tumia cheti changu" inakuruhusu kusaini kwa faili ya .pfx/.p12 uliyokwisha kuwa nayo (kwa mfano DSC ya Kihindi inayotumika kwa kodi, GST, au maombi ya zabuni) — kwa kuwa mamlaka inayotambulika iliitoa, programu zinazoamini mamlaka hiyo zinaonyesha sahihi kama iliyothibitishwa moja kwa moja.
Je, sahihi iliyojisainisha ni halali kisheria?
Hii inategemea nchi yako na matumizi — kikriptografia inathibitisha uadilifu (faili halijabadilika) na nani alisaini, lakini haibebi uzito ule ule wa kisheria wa moja kwa moja kama sahihi kutoka kwa mamlaka ya vyeti yenye leseni. Angalia mahitaji yako mahususi kabla ya kuitegemea kwa mikataba au maombi rasmi.
Je, nenosiri la cheti changu au funguo yangu binafsi hutumwa mahali popote?
Hapana — kila kitu kinafanyika kwenye kivinjari chako. Cheti chako, nenosiri lake, na funguo binafsi havitoki kwenye kifaa chako.
Which laws actually recognize signatures like these?
Most countries have some law covering electronically signed documents — the US ESIGN Act and UETA, the EU's eIDAS regulation, India's IT Act 2000, and similar rules elsewhere. But these laws almost always draw a line between a signature backed by a certificate a recognized authority issued and one you generated yourself. A DSC signed with "Use my certificate" is the kind these laws were built around. A signature from "Create a free signature" cryptographically proves the file wasn't tampered with, but it doesn't get the same automatic recognition — treat it like any other self-signed certificate.
Can I send this to someone else to sign, or track multiple signers?
No — this tool signs a PDF that's already on your device, by you, right now. It doesn't email the file to anyone, collect signatures from other people, or give you a dashboard to track who's signed what. If you need to route a document to several signers and follow its status, you'll need a dedicated e-signature workflow service instead.
How does someone else verify the signature once I send them the file?
They open it in a PDF reader that checks digital signatures — Adobe Acrobat or Reader does this automatically and shows a signature panel with a checkmark or warning icon. Clicking it shows whether the document has changed since signing and who the certificate says signed it. If you signed with "Use my certificate" and the reader already trusts that CA, it shows as verified with no extra steps; a self-signed certificate shows as valid-but-unverified until the recipient chooses to trust it.