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Hello, <br />
1. I have an msg file which is digitally signed and not encrypted, I could see 2 attachments from the email one is .P7M and the other one is .P7S. Can this happen ? I mean it should be either a .P7m file or a .P7s file right? <br />
2. Can .P7s file support encryption and digital sign both? <br />
3. Can you explain in detail the difference between .P7m and .p7S files?
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Hello, 
1. I have an msg file which is digitally signed and not encrypted, I could see 2 attachments from the email one is .P7M and the other one is .P7S. Can this happen ? I mean it should be either a .P7m file or a .P7s file right? 
2. Can .P7s file support encryption and digital sign both? 
3. Can you explain in detail the difference between .P7m and .p7S files?

P7S and P7M files

Encryption is the process of encoding messages or information in such a way that only authorized parties can read it. In an encryption scheme, the intended communication information or message, referred to as plaintext, is encrypted using an encryption algorithm, generating ciphertext that can only be read if decrypted. For technical reasons, an encryption scheme usually uses a pseudo-random encryption key generated by an algorithm. An authorized recipient can easily decrypt the message with the key provided by the originator to recipients, but not to unauthorized interceptors.

Encryption

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.

Outlook

Digital forensics encompasses the recovery and investigation of material found in digital devices, often in relation to computer crime. Digital forensics investigations have a variety of applications. The most common is to support or refute a hypothesis before criminal or civil (as part of the electronic discovery process) courts. The technical aspect of an investigation is divided into several sub-branches, relating to the type of digital devices involved; computer forensics, network forensics, forensic data analysis and mobile device forensics. The typical forensic process encompasses the seizure, forensic imaging (acquisition) and analysis of digital media and the production of a report into collected evidence.

Digital Forensics

The cyber security specialization covers the fundamental concepts underlying the construction of secure systems, from the hardware to the software to the human-computer interface, with the use of cryptography to secure interactions. Cyber security refers to the protection of personal or organizational information or information resources from unauthorized access, attacks, theft, or data damage. This includes controlling physical access to the hardware, as well as protecting against the harm that may come via network access, data and code injection, and due to malpractice by operators, whether intentional, accidental, or due to them being tricked into deviating from secure procedures.