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      The LP7 evidence format

The LP7 digital evidence format is an enveloping signature which encapsulates the following information:
- the signed content, which may be a file of any type (MS Word, Autocad, PDF, ...), or even the content a memory buffer,
- all the signatures and countersignatures which have been affixed successively on the document,
- as well as numerous elements of traceability such as timestamp tokens and transactional tokens.

Thanks to a number of functionality related, the LP7 digital evidence format facilitates the transposition of paper-based practices:
- Original document with letterhead,
- Signatures and countersignatures (also called hierarchical signatures),
- Location, date et time of signature,
- Timestamping,
- Commitment type,

- Signature policy,
- etc.

The LP7 file format is entirely based on established technical standards

- Format: XAdES (XML Advanced Electronic Signature - ETSI TS 101 903) and CAdES (CMS Advanced Electronic Signature - ETSI TS 101 733)
- Timestamping: RFC 3161
- Certificates: X509V3
- Cryptographic library: Bouncy Castle
- Operating systems: Windows, MacOs, Linux




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