Attached Signatures
The characteristics of attached digital
signatures in PKCS#7 and S/MIME formats are:
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PKCS#7:
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Includes the document in plain text with digital signature.
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Ensures that certificates are encoded in Abstract
Syntax Notation One (ASN.1) format, where ASN.1 is an ISO/IEC standard
for encoding rules used in ANSI X.509 certificates and PKCS documents.
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S/MIME2: