page_title: Mobile Signature Service
section_title: Completing a signature transaction
hierarchical_section_title: Mobile Signature Service / Completing a signature transaction
caption_attribution_description: The flow of a signature request in a Mobile Signature Service system
context_page_description: Mobile Signature Service is a high-level service specified by the European Telecommunications Standards Institute that defines the roles participating in mobile identity management and mobile signature transactions, as well as functional and business-related requirements and interfaces. The specification is the governing standard for PKI and enables cross-compatible mobile signature solutions.
context_section_description: When a mobile user accesses an AP's service and wishes to perform a mobile signature, the AP sends a signature request to the mobile user's HomeMSSP via an AE MSSP. The MSSP forwards the AP's request to the mobile user's SIM card. Upon receiving the signature request, the mobile user's SIM card can only complete the signature when the mobile user gives their signing PIN. The requested data is signed with the mobile user's private key and sent back to the mobile user's HomeMSSP, which then returns the signature to the AP, who can verify it with the mobile user's public key.
caption: Signature transaction in MSS
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