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CAdES - Coggle Diagram
CAdES
attributes
signed
are covered by the digital signature value produced by the signer using his/her private key, which implies that the signer has processed these attributes before creating the signature.
unsigned
are added by the signer, by the verifier or by other parties after the production of the signature. They are not secured by the signature in the SignerInfo element (the one computed by the signer); however they can be actually covered by subsequent times-stamp attributes.
info
Signed and unsigned attributes are stored, respectively, in the signedAttrs and unsignedAttrs fields of SignerInfo
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Security Handlers
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Adobe.PPKLite is the default security handler used for performing private key functions, validating signatures, and signing and encrypting documents.
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CAdES signatures are built on CMS signatures by incorporation of signed and unsigned attributes, which fulfil certain common requirements (such as the long term validity of digital signatures, for instance)