Details of extension .p7a

On this page, we're going to take a closer look at the .p7a file extension, which is related to PKCS #7 Attached Signature. We'll explain what exactly a .p7a fileformat is and how you can use it. If you're interested in learning more details about this type of file, we'll show you where to find them. And if you ever need to convert .p7a files into different formats, we'll give you some tips on how to do that too. Let's see the file format associated with this file extension!

Contents

• PKCS #7 Attached Signature

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PKCS #7 Attached Signature

The P7A file is a PKCS #7 Attached Signature. A digital signature is a type of asymmetric cryptography. For messages sent through an insecure channel, a properly implemented digital signature gives the receiver reason to believe the message was sent by the claimed sender.

Category: Data files

Application: Microsoft Office Outlook

Program name: -

Mime-type: application/pkcs7-signature

Magic bytes (HEX): -

Magic string (ASCII): -

Aliases:

-

Related extensions:

.p7m PKCS #7 Encrypted Message

.p7c PKCS #7 Certificate Data

.sec PGP Secret Keyring Data

.p7b PKCS #7 Certificate Data in Base 64 Format

Links:

Public Key Cryptography on Wikipedia

The .p7a file extension might not only belong to a single type of file, there could be various kinds that use it. Keep in mind that files with the .p7a extension may contain various content types. If you have helpful information about this extension, write to us!

The .p7a extension is frequently misused

People sometimes confuse the .p7a filename extension. Based on the searches on our site, here are the most common misspellings from the past year.

Having trouble opening a .p7a file?

If you want to open a .p7a file on your computer, you just need to have the appropriate program installed. Incorrect settings for the .p7a association can trigger this error.

Windows can't open this file:

File: example.p7a

To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select from a list of programs that are installed on your computer.

To change file associations:

• Right-click a file with the extension whose association you want to change, and then click Open With.
• In the Open With dialog box, click the program whith which you want the file to open, or click Browse to locate the program that you want.
• Select the Always use the selected program to open this kind of file check box.

Supported operating systems

Windows Server 2016/2019/2022, Windows 7, Windows 8, Windows 10, Windows 11, Linux, Mac OS X, macOS, iOS, Android