Abstract Syntax Notation One (ASN.1) is a language that defines the way data is sent across dissimilar communication systems.

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BER or DER X9.62 ECDSA signature

The signature format for ECDSA signatures can be encoded using ASN.1 integers according to X9.62 or it can comprise of two integers with the same size as the key size. In case the X9.62 format is ...
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Enhanced Security Services / CAdES for PKCS7 - multiple signers for SignerInfo's?

In RFC5652, Cryptographic Message Syntax (CMS), section 5.3. SignerInfo Type, there's a sid field that maps to this: ...