Entity 303 email format

Entity 303 is a type of email format used by the United States Department of Defense (DoD) and other government agencies. It is a standardized format for sending and receiving electronic mail (email) that is used to ensure the security and integrity of sensitive information.

The Entity 303 email format is based on the Internet Message Format (IMF) and is designed to provide an additional layer of security and authentication for email messages. It uses a combination of encryption, digital signatures, and authentication mechanisms to ensure that email messages are not tampered with or intercepted during transmission.

Here is an example of an Entity 303 email format:

Header

• From: [sender's email address]
• To: [recipient's email address]
• Date: [date and time of sending]
• Subject: [subject line of the email]
• Message-ID: [unique identifier for the email message]
• Content-Type: text/plain; charset=UTF-8

Authentication

• Authentication-Info: [digital signature of the sender]
• Authentication-Result: [result of the authentication check]

Encryption

• Content-Encryption: [algorithm used for encryption]
• Content-Encryption-Key: [encryption key used to encrypt the message]

Body

• [plain text or encrypted message body]

Footer

• [footer information, such as a digital signature or a timestamp]

The Entity 303 email format is used to send sensitive information, such as classified documents or personal identifiable information (PII), over the internet. It is designed to provide an additional layer of security and authentication to ensure that the email message is not tampered with or intercepted during transmission.

Here are some key features of the Entity 303 email format:

• Encryption: The email message is encrypted using a symmetric key algorithm, such as AES.
• Digital signatures: The sender's digital signature is included in the email message to authenticate the sender and ensure that the message has not been tampered with.
• Authentication: The email message is authenticated using a combination of digital signatures and authentication mechanisms, such as X.509 certificates.
• Integrity: The email message is checked for integrity to ensure that it has not been tampered with or modified during transmission.
• Non-repudiation: The email message is designed to provide non-repudiation, which means that the sender cannot deny sending the message.

Overall, the Entity 303 email format is a secure and reliable way to send sensitive information over the internet. It provides an additional layer of security and authentication to ensure that the email message is not tampered with or intercepted during transmission.