Digital Signing guidelines - NatWest

Contents
1. Introduction 5
1.1 Introduction to Bankline Direct 5
1.2 Purpose of Technical Specifications 5
1.3 Purpose of Digital Signature Guidelines 6
1.4 Use of Digital Signature Guidelines 6
2. Overview of Digital Signing Solutions 7
3. S/MIME Digital Signatures 8
3.1 MIME 8
3.2 S/MIME Digital Signatures 8
4. Use of File Signing 13
4.1 Typical Use of an HSM 13
4.2 Typical Use of Smartcards 13
5. Bankline Direct Transmissions 14
5.1 Setup 14
5.2 Integration 14
5.3 Signature Validation 15
5.4 Signed File Example 16
6. Smartcard File Signing 17
6.1 Smartcard Signing Overview 17
6.2 Setup Instructions 19
6.3 “PostURL” page 20
6.4 S/MIME Output File 21
6.5 Troubleshooting Tips 22
7. Hardware Security Module 23
7.1 HSM Requirements 23
7.2 HSM Setup 23
7.3 Integration 23
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