Protecting Email Header Integrity via Body Nesting
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Solution Overview
Problem
Existing email protocols do not effectively protect the integrity and confidentiality of header fields in encrypted messages, allowing tampering with header content during transmission, as only the message body is typically encrypted or signed, not the header.
Innovation Solution
Inserting the contents of header fields to be protected into the message body before encoding and transmission, allowing existing secure communication protocols to encrypt the message body, which includes the protected header content, ensuring the header fields can be extracted and verified by the recipient.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If only the message body is encrypted or signed, then the encoding process remains simple and existing protocols can be used, but the header fields are vulnerable to tampering and lack integrity protection
Solution Approach 1:
The header field contents are nested within the message body as embedded elements. The sender's device inserts the content of header fields (such as Subject, From, To) into the message body in a structured format. When the message is decoded by the recipient's device, these embedded header contents are extracted and placed back into the corresponding header fields, ensuring integrity verification.
Solution Approach 2:
The header field contents are inserted into the message body before the encoding process occurs. This preliminary action ensures that the header information is protected along with the message body during encryption and transmission, allowing integrity verification to be performed on header fields that would otherwise be vulnerable to tampering.
2Reliability
If header fields are protected by inserting their contents into the message body, then integrity and confidentiality of headers are ensured, but the message body size increases and processing complexity increases
Solution Approach 1:
Instead of encrypting or protecting the entire message header, only the essential header fields are selected and their contents are inserted into the message body. This partial action approach protects the most critical header information (such as Subject, From, To fields) while avoiding the overhead of protecting the entire header structure, thus minimizing the increase in message body size.
3Reliability
If header fields are protected by insertion into message body, then tampering detection is enabled, but the ease of operation and message processing becomes more difficult
Solution Approach 1:
The recipient's device automatically performs the extraction of embedded header contents from the message body and places them into the corresponding header fields during the decoding process. This self-service mechanism eliminates the need for manual intervention or complex user operations, making the tampering detection process transparent and automatic while maintaining ease of operation.
Solution Approach 2:
The system provides feedback by comparing the extracted header contents with the actual header fields after decoding. If discrepancies are detected, the system can indicate potential tampering to the user. This feedback mechanism enables automatic integrity verification without requiring complex user actions, maintaining ease of operation while enhancing security.
Data Source
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AI summary
Embodiments of the systems and methods described herein facilitate the transmitting, receiving, and processing of encoded messages wherein the header fields in the message header are protected. In one embodiment, the contents of the header fields to be protected are inserted into the message body as one or more additional lines of text, for example, prior to encoding and transmitting the message to a message recipient. Upon receipt of the message, the message recipient processes the encoded message such that the contents of the protected header fields can be extracted from the message body. Accordingly, by inserting the contents of the header fields to be protected into the message body, the header fields may be protected using existing standards and protocols for facilitating secure message communication.