Validating electronic signatures

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A common denominator in most countries is the level of an advanced electronic signature requiring that: Electronic signatures may be created with increasing levels of security, with each having its own set of requirements and means of creation on various levels that prove the validity of the signature.

To provide an even stronger probative value than the above described advanced electronic signature, some countries like the European Union or Switzerland introduced the qualified electronic signature.

Data structure of an Electronic Signature 22 3.1 General Syntax 22 3.2 Data Content Type 22 3.3 Signed-data Content Type 22 3.4 Signed Data Type 22 3.5 Encapsulated Content Info Type 23 3.6 Signer Info Type 23 3.6.1 Message Digest Calculation Process 23 3.6.2 Message Signature Generation Process 24 3.6.3 Message Signature Verification Process 24 3.7 CMS Imported Mandatory Present Attributes 24 3.7.1 Content Type 24 3.7.2 Message Digest 24 3.7.3 Signing Time 24 3.8 Alternative Signing Certificate Attributes 24 3.8.1 ESS Signing Certificate Attribute Definition 25 3.8.2 Other Signing Certificate Attribute Definition 25 3.9 Additional Mandatory Attributes 26 3.9.1 Signature policy Identifier 26 3.10 CMS Imported Optional Attributes 28 3.10.1 Countersignature 29 3.11 ESS Imported Optional Attributes 29 3.11.1 Content Reference Attribute 29 3.11.2 Content Identifier Attribute 29 3.11.3 Content Hints Attribute 29 3.12 Additional Optional Attributes 30 3.12.1 Commitment Type Indication Attribute 30 3.12.2 Signer Location attribute 32 3.12.3 Signer Attributes attribute 33 3.12.4 Content Time-Stamp attribute 34 3.13 Support for Multiple Signatures 34 3.13.1 Independent Signatures 34 3.13.2 Embedded Signatures 34 4.

Validation Data 35 4.1 Electronic Signature Time-Stamp 36 4.1.1 Signature Time-Stamp Attribute Definition 36 4.2 Complete Validation Data 37 4.2.1 Complete Certificate Refs Attribute Definition 38 4.2.2 Complete Revocation Refs Attribute Definition 38 4.3 Extended Validation Data 40 4.3.1 Certificate Values Attribute Definition 40 4.3.2 Revocation Values Attribute Definition 41 4.3.3 ES-C Time-Stamp Attribute Definition 42 4.3.4 Time-Stamped Certificates and CRLs Attribute Definition 42 4.4 Archive Validation Data 43 4.4.1 Archive Time-Stamp Attribute Definition 43 5.

Security Considerations 44 5.1 Protection of Private Key 44 5.2 Choice of Algorithms 44 6.

Conformance Requirements 45 6.1 Signer 45 6.2 Verifier using time-stamping 46 6.3 Verifier using secure records 46 7. Authors' Addresses 48 Annex A (normative): ASN.1 Definitions 49 A.1 Definitions Using X.208 (1988) ASN.1 Syntax 49 A.2 Definitions Using X.680 1997 ASN.1 Syntax 57 Annex B (informative): General Description 66 B.1 The Signature Policy 66 B.2 Signed Information 67 B.3 Components of an Electronic Signature 68 B.3.1 Reference to the Signature Policy 68 B.3.2 Commitment Type Indication 69 B.3.3 Certificate Identifier from the Signer 69 B.3.4.

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Technically, a qualified electronic signature is implemented through an advanced electronic signature that utilizes a digital certificate, which has been encrypted through a security signature-creating device Since well before the American Civil War began in 1861, morse code was used to send messages electrically by telegraphy.

This should be done before sending them documents that you have digitally signed.

Fortunately, allows you to customize the information supplied with your digital signature as well as its appearance.

These profiles are CAd ES-T, CAd ES-C, CAd ES-X-L and CAd ES-A.

Each following profile adds some properties to the previous one.

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