Encrypted Message Access Control Against Brute Force Attacks
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Solution Overview
Problem
Existing encryption methods for electronic messages are vulnerable to unauthorized decryption through brute force attacks, where an attacker repeatedly attempts to guess the passphrase, potentially leading to excessive attempts and compromising message security.
Innovation Solution
Implementing a method that restricts access to encrypted messages after a predetermined limit of failed decryption attempts is exceeded, which may include erasing the message, locking the device, or disabling access to prevent further unauthorized decryption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If encryption methods are used to protect electronic messages, then message security is improved, but the system becomes vulnerable to brute force attacks where attackers can repeatedly attempt to guess the passphrase
Solution Approach 1:
The patent applies preliminary anti-action by implementing a countermeasure before the brute force attack can succeed. A predetermined limit on decryption attempts is established in advance, and when this limit is reached, access to the encrypted message is restricted. This preliminary protective measure prevents the attacker from continuing unlimited passphrase guessing attempts, thereby countering the brute force attack vulnerability while maintaining message security through encryption.
2Ease of operation
If unlimited decryption attempts are allowed, then ease of operation for legitimate users is improved, but security is compromised due to excessive attempts
Solution Approach 1:
The patent applies parameter changes by modifying the system's operational parameters dynamically. A predetermined limit parameter is set for decryption attempts, and when this parameter is exceeded, the system changes its state by restricting access to the encrypted message. This parameter-based approach balances user convenience (allowing multiple attempts for legitimate users who may forget their passphrase) with security (preventing unlimited attempts that could lead to successful brute force attacks).
Data Source
AI summary
After a predetermined limit for decryption attempts has been exceeded by a user attempting to decrypt an encrypted electronic message or attempting to decrypt a encrypted electronic certificate associated with an electronic message, access to the electronic message may be restricted.