PeterkaIt is also worth mentioning the

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Has already switched to newer hashing functions but in the case of the letter in the following image instead of a qualified seal it also only used the recognized one and did not bother to attach a time stamp Therefore it is also only a seal at a level corresponding to level BAuthor Jiří older nonreference format which was created apparently by hand in the archaic version of Adobe Acrobat Pro from 2 Although this version already supported new reference formats the default setting created only the nonreference ones and unfortunately this default setting has remained in Reader and Acrobat to this day.



For example financial authorities already provide their documents with qualified electronic Indonesia WhatsApp Number Data signatures and also attach qualified time stamps and thus it is level T But they still only use the old nonreference formats and also the outdated SHA hashing function see the following image  Author Jiří PeterkaWith which there are practical problemsDue to the use of a deprecated hash function the validity of the seal on such documents will not be validated by.







DSS and generally all services that already refuse to rely on SHA see the following figure On the other hand for example Adobe Acrobat and Reader Czech POINTs court filings and probably other OVMs have no problem with SHAAuthor Jiří PeterkaAlso the older nonreference format is an obstacle to successful validation for those services that care about it Like for example the Slovak QES portal Author Jiří PeterkaFor others such as qualified authentication service.