Multi-Key Stream Cipher Encryption via Circular Linked Lists
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Solution Overview
Problem
Current stream ciphers face security challenges due to their vulnerability to attacks and deciphering, particularly as their methods become open secrets, compromising the encryption of ciphertext.
Innovation Solution
A sequential encryption method based on multi-key stream ciphers uses a dynamically parasitic chaotic stream, stored in circular linked lists, performing bitwise operations to generate a stream random sequence for encrypting plaintext data, resulting in ciphertext with strong diffusion properties and high randomness, making it difficult to decipher.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional stream ciphers are used for encryption, then encryption can be performed, but the security of the ciphertext faces great challenges due to vulnerability to attacks and deciphering
Solution Approach 1:
The patent employs dynamic key stream generation using chaotic systems with sensitive dependence on initial conditions. The key stream is continuously updated based on current system state, making it adaptive and unpredictable to attackers, thus resolving the contradiction between providing encryption and maintaining security against attacks
Solution Approach 2:
The patent utilizes chaotic systems where small changes in initial conditions or system parameters lead to completely different key stream sequences. This parameter sensitivity ensures that even minor variations in encryption keys produce fundamentally different ciphertexts, eliminating patterns that attackers could exploit
2Ease of manufacture
If complex algebraic operations and pseudo-random number generation are used in stream ciphers, then encryption can be completed, but the methods become open secrets after years of research
Solution Approach 1:
The patent replaces traditional mechanical cipher designs with chaotic dynamic systems. Instead of fixed algebraic operations, it uses chaotic maps and differential equations that are computationally intensive and resistant to algebraic attacks, thereby maintaining security while remaining implementable
Solution Approach 2:
The patent introduces chaotic systems as an intermediary between the plaintext and ciphertext. This intermediary layer of complex dynamic behavior obscures the relationship between input and output, making it extremely difficult to reverse-engineer the encryption method even when the basic algorithm is known
3Productivity
If linear feedback shift registers are used to generate key stream sequences, then pseudorandom sequences can be generated, but the autocorrelation decays slowly
Solution Approach 1:
The patent changes the fundamental parameter of sequence generation from linear feedback to chaotic dynamics. This results in key stream sequences with exponentially decaying autocorrelation, providing both fast generation speed and excellent statistical properties for encryption
Data Source
AI summary
The invention discloses a sequential encryption method based on multi-key stream ciphers, comprising the following steps of: acquiring plaintext data, and storing the acquired plaintext data in the form of a circular linked list; storing a plurality of key sequences in the form of a circular linked list, respectively; performing a bitwise operation on the key sequences according to a specified starting bit to generate a stream random sequence; and, reconstructing the plaintext data according to the stream random sequence to generate encrypted ciphertext data. The method of the invention is simple in encryption and decryption, difficult to decipher, easy to implement by a computer without auxiliary hardware devices, fast in encryption and decryption speed, strong in the diffusion property of the generated ciphertext, and good in anti-interception performance and the like.