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2
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0answers
26 views

Finding the EMSA-PKCS1-v1_5 DigestAlgorithm field in the x509 certificate

From the RFC - https://www.ietf.org/rfc/rfc3447.txt A.2.4 RSASSA-PKCS1-v1_5 For each OID, the parameters field associated with this OID in a value of type AlgorithmIdentifier shall have a value ...
2
votes
0answers
120 views

CMS/PKCS#7: specifying signatureAlgorithm with digest?

I'm confused about algorithm selection for Cryptographic Message Syntax (a.k.a. CMS, PKCS#7) signed objects (RFC5652 Section 5.1). The SignerInfo structure (RFC5652 Section 5.3) has two separate ...
1
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0answers
42 views

Downloadable Autonomous System contact information

When under (a security) attack, it might be useful for the victim to first identify the source IP, then potentially contact the offending ISP. There seem to be plenty of tools for the part where an IP ...
0
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0answers
36 views

I don't recognize the format of this CMS blob

I generated a CMS blob with the following OS X command: security cms -E -i <file> -r <identifier> The blob I got out of it has the following DER structure (data bytes omitted): ...
0
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0answers
43 views

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: SignerIdentifier ::= CHOICE { issuerAndSerialNumber IssuerAndSerialNumber, ...