PK7 File Extension

Have a problem opening a .PK7 file? We collect information about file formats and can explain what PK7 files are. Additionally we recommend software suitable for opening or converting such files.

What is the .PK7 file type?

The .pk7 filename extension is associated with the PKCS ♯7 Cryptographic Message Syntax Standard (RFC 2315) and conventionally assigned to PKCS ♯7 cryptographic message files. The PKCS (Public Key Cryptography Standards) specifications define different aspects of using asymmetric cryptography for encryption, signature, and verification of digital data.

A PKCS ♯7 message embeds one or more digitally signed documents in any format (most commonly, PDF). It is a multi-part text sequence consisting of header, Base64-encoded payload, and digital signature. The digital signature allows to verify authenticity and origin of the embedded documents. When saved as files, PKCS ♯7 messages are usually given the .pk7 extension, although it is not required. Such .pk7 files can be opened and decoded using any PKCS ♯7-compliant cryptographic utility.

Most notably, such PKCS ♯7 (.pk7) files are used by the Spanish digital content provider Movistar (Telefonica) to provide legally valid e-invoices to their customers. In this case, the .pk7 file incorporates a regular PDF file signed with a digital signature.

Software to open or convert PK7 files

You can open PK7 files with the following programs: 

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