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  2. PAdES - Wikipedia

    en.wikipedia.org/wiki/PAdES

    PAdES has 4 levels of verification for digital certificate, from the most simple and basic (b-b, indicating a signature was executed with a certificate that was valid on a date) to the most complex (b-LTV) allowing electronically signed documents to remain valid for long periods (long term validity) even if underlying cryptographic algorithms ...

  3. PDF - Wikipedia

    en.wikipedia.org/wiki/PDF

    PDF files may be digitally signed, to provide secure authentication; complete details on implementing digital signatures in PDF are provided in ISO 32000-2. PDF files may also contain embedded DRM restrictions that provide further controls that limit copying, editing, or printing. These restrictions depend on the reader software to obey them ...

  4. Certificate Transparency - Wikipedia

    en.wikipedia.org/wiki/Certificate_Transparency

    A log appends new certificates to an ever-growing Merkle hash tree. [1]: §4 To be seen as behaving correctly, a log must: Verify that each submitted certificate or precertificate has a valid signature chain leading back to a trusted root certificate authority certificate. Refuse to publish certificates without this valid signature chain.

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  6. List of file signatures - Wikipedia

    en.wikipedia.org/wiki/List_of_file_signatures

    However, some file signatures can be recognizable when interpreted as text. In the table below, the column "ISO 8859-1" shows how the file signature appears when interpreted as text in the common ISO 8859-1 encoding, with unprintable characters represented as the control code abbreviation or symbol, or codepage 1252 character where available ...

  7. IdenTrust - Wikipedia

    en.wikipedia.org/wiki/IdenTrust

    As a certificate authority (CA), IdenTrust provides public key infrastructure (PKI) and validation for digital certificates, including TLS/SSL certificates, email security via S/MIME certificates, digital signature certificates, code signing certificates and x.509 certificates for protecting network and IoT devices.

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