Encryption Key Control for Image Forming Apparatus Security
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Solution Overview
Problem
Multifunction peripherals in office networks often lack secure encryption protocols, making them vulnerable to unauthorized use and data leakage, as existing security policies struggle to enforce strong cryptography usage.
Innovation Solution
An image forming apparatus equipped with a storage unit for encryption keys, a setting unit for selecting encryption keys based on specific protocols, and a control unit that determines and changes keys to ensure only strong encryption is used, preventing the use of weak cryptography.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a security policy prohibiting use of weak cryptography is set to enhance safety, then security reliability is improved, but communication functionality using encryption keys is lost when the encryption key does not meet the required strength
Solution Approach 1:
The system performs preliminary determination of encryption key strength before communication occurs. The control unit checks whether the encryption key meets the required strength specified in the security policy in advance, and proactively switches to a default key if the check fails, preventing communication using weak cryptography while maintaining functionality through the default key fallback mechanism
Solution Approach 2:
The control unit acts as an intermediary between the encryption key selection mechanism and the communication protocol. It intercepts the encryption key selection process, validates the key strength against security policy requirements, and mediates by switching to a default key when necessary, thereby ensuring both security compliance and communication continuity
2Reliability
If the encryption key is changed to meet security policy requirements, then security compliance is improved, but communication using the original protocol may be disrupted
Solution Approach 1:
The system changes the encryption key parameter from a weak key to a strong key that meets security policy requirements. The control unit determines the strength of the encryption key and switches to a default key with sufficient strength, thereby changing the cryptographic parameter while maintaining the same communication protocol structure and ensuring both security compliance and protocol stability
Data Source
AI summary
An image forming apparatus includes a storage unit configured to store a plurality of encryption keys, wherein the plurality of encryption keys includes at least a default key, a setting unit configured to set an encryption key to be used for encryption communication according to a specific protocol, wherein the encryption key is selected from the plurality of encryption keys, an obtaining unit configured to obtain security setting information for limiting use of an encryption key, and a control unit configured to, in the case where the security setting information is obtained, determine whether or not the encryption key set by the setting unit has a predetermined encryption strength, wherein the control unit is configured to change the set encryption key to the default key in response to determining that the set encryption key has not the predetermined encryption strength.