pdf - Does iText Community 5.4.2 support creating Digital Signature 'PAdES' -


does 'itext' community version 5.4.2 support creating 'pades' digital signature standard pdf files ?

thank in advance best regards pearapon s. bangkok, thailand

you might want read white paper digital signatures pdf documents bruno lowagie (itext software). 2013, details might out of date, still introduction itext 5 signing api , interesting read in context of pdf signing in general.

concerning question in particular explains:

pades set of restrictions , extensions pdf , iso-32000-1 making suitable advanced electronic signatures. it’s described in ts 102 778 (etsi, 2009), , implemented in iso-32000-2. pades consists of 6 parts:

  • part 1—the first part overview of support signatures in pdf documents, , lists features of pdf profiles in other documents.

  • part 2—pades basic based on iso-32000-1. if want know more digital signatures in pdf, should read specification before starting dig pdf reference. pades part 2 supported in itext since version 5.0.0.

  • part 3—pades enhanced describes profiles based on cades: pades basic electronic signature (bes) , explicit policy electronic signature (epes). pades part 3 supported in itext since version 5.3.0.

  • part 4—pades long-term validation (ltv) protecting data beyond expiry of user’s signing certificate. mechanism requires document security store (dss). pades part 4 supported in itext since version 5.1.3.

  • part 5—pades xml content describes profiles xades signatures. instance, after filling xfa form, xml content embedded in pdf file, user may sign selected parts of form. isn’t supported in itext yet.

  • part 6—visual representations of electronic signatures. supported in itext, depends on other factors. instance: certificate contain sufficient information?

as mentioned before, document 2013 and, therefore, references etsi ts on pades , not newer etsi en documents. changes required newer ens have been implemented in current itext 5 version, though, statements still hold.

ps: online version of code of examples in whitepaper has continuously been updated. thus, if want try examples, sure the updated code.


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