CN1322693C - Cascading information encryption system by complemented capabilities of chaos encryption and traditional encryption - Google Patents
Cascading information encryption system by complemented capabilities of chaos encryption and traditional encryption Download PDFInfo
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- CN1322693C CN1322693C CNB021497931A CN02149793A CN1322693C CN 1322693 C CN1322693 C CN 1322693C CN B021497931 A CNB021497931 A CN B021497931A CN 02149793 A CN02149793 A CN 02149793A CN 1322693 C CN1322693 C CN 1322693C
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Abstract
The present invention relates to a cascading information encryption system with the complementation of the performance of chaotic encryption and traditional encryption. The system is composed of an information generator, an information transmission channel and an information receiver, wherein the information generator is formed by the mutual cascade connection of a chaotic encryption stage and a traditional encryption stage; the information receiver is formed by the mutual cascade connection of a traditional decryption stage and a chaotic decryption stage. The present invention is characterized in that preceding stage encryption is formed by the closed loop chaotic cipher key generator realized by hardware, and the traditional encryption stage is used as back stage encryption. The formed information encryption system adopts the easy evaluation characteristic of the unpredictability of a former chaotic cipher key signal, the space design technology and the safety of a latter mature cipher key to realize the performance complementation of the two encryption stages. Thus, the target of one cipher each time can be realized to a certain extent. The anti-attack capability of the system is obviously higher than any single information system, and a decryption method which is more effective than exhaustive attack does not exist in the whole system.
Description
(1) technical field
The present invention relates to the information encryption field, particularly chaos encryption technology specifically is meant the cascaded message encryption system of a kind of chaos encryption and conventional cryptography performance complement.
(2) background technology
The conventional information encryption system is based on conventional cipher and learns principle, moves in centrifugal pump one discrete time mode; The confidentiality of system does not rely on the maintaining secrecy of encryption system or algorithm, and depends on key, generally adopts pseudo random number as key; Because of the unique correspondence of a pair of grouping of its plaintext and ciphertext, promptly key signal has predictability, and this is the key reason that it may be decrypted; But the conventional cryptography system has ripe key space designing technique, and its fail safe is easier to assessment.The chaos information encryption system is the encryption system that adopts uncertain chaotic signal, moves in successive value mode one continuous time usually, do not exist unique corresponding plaintext, ciphertext right, and the key signal generator is can be covert; But the chaos encryption system does not solve the design problem of key space at present, and security of system can only rely on limited numerical simulation algorithm to check.In addition, the phase rail that utilizes the chaos initial value to determine develops as the encryption system of cryptographic algorithm, belongs to pseudo-chaos encryption system, its can be used as the circuit parameter number of key parameter less, be identified easily, be the main cause of its security of system difference.Chaos encryption system on the real meaning, when utilizing uncertain key signal, this initial value just can not utilize as key parameter.
(3) summary of the invention
Purpose of the present invention is exactly in order to solve above-mentioned the deficiencies in the prior art part, and the cascaded message encryption system of a kind of chaos encryption and conventional cryptography performance complement is provided.The concatenated schemes that this system takes chaos encryption system and conventional cryptography system to combine, both advantages are all brought into play, make whole encryption system have enough big key space, make it not exist, obviously improve anti-attack ability than the effective more deciphering method of exhaustive attack.
The cascaded message encryption system of a kind of chaos encryption of the present invention and conventional cryptography performance complement is characterized in that, it is interconnected by information generator, information transfer channel and message recipient three parts forms; Wherein, information generator is made up of chaos encryption level and the mutual cascade of conventional cryptography level, and message recipient is made up of traditional decryption stage and the mutual cascade of Chaotic Solution level of confidentiality.
In order to realize the present invention better, described chaos encryption level is made of jointly information source, closed loop chaotic key generator, chaos encryption device, information synthesizer, phasor converter, wherein, information source is connected with the chaos encryption device by output signal line with closed loop chaotic key generator, closed loop chaotic key generator is connected with the information synthesizer by synchronous signal line simultaneously, the chaos encryption device is connected with the information synthesizer by encrypting output signal line, and the information synthesizer is connected with the phasor converter by output signal line; Described conventional cryptography level is made of jointly A/D converter, random number key, conventional cryptography device, and wherein, the A/D converter is connected with the conventional cryptography device by output signal line respectively with the random number key; Described traditional decryption stage is made of jointly random number key, traditional decipher, D/A converter, and wherein, the random number key is connected with traditional decipher, and traditional decipher is connected with the D/A converter by output signal line; Described Chaotic Solution level of confidentiality is made of jointly phasor converter, information decomposition device, closed loop chaotic key generator, chaos decode device, information source, wherein, the phasor converter is connected with the information decomposition device by output signal line, the information decomposition device is connected with the chaos decode device by output signal line, be connected with closed loop chaotic key generator by synchronous signal line simultaneously, closed loop chaotic key generator also is connected with the chaos decode device by output signal line, and the output signal of chaos decode device is an information source; Described closed loop chaotic key generator and chaos encryption device can be combined, connect to form jointly by linear circuit chain, unidirectional coupler, nonlinear circuit chain, wherein, the linear circuit chain is connected with unidirectional coupler by output signal line, unidirectional coupler is connected with the nonlinear circuit chain by output signal line, and the nonlinear circuit chain is connected with the linear circuit chain by output signal line again.
The present invention compared with prior art has following advantage and beneficial effect:
1. the present invention adopts the complementary cascade enciphering scheme composition information encryption system that chaos encryption and conventional cryptography combine, because the pluses and minuses of two subsystems compensate each other, has overcome deficiency separately, and both sides' advantage is all brought into play.
2. in the present invention, produce uncertain chaotic key signal, reach the target of the real chaos encryption of " one time cryptosystem " to a certain extent by hard-wired closed loop chaotic key generator.
3. the invention solves whole encryption system and have the design problem of enough big key space,
4. anti-attack ability of the present invention is apparently higher than wherein arbitrary independent information encryption system, and whole system does not exist than the more effective deciphering method of exhaustive attack.
(4) description of drawings
Fig. 1 is a scantling plan of the present invention;
Fig. 2 is a baseband system block diagram of the present invention;
Fig. 3 is by the closed loop chaotic key generator and the chaos encryption device circuit block diagram of hard-wired combination among the present invention;
Fig. 4 is the closed loop chaotic key generator that makes up in the embodiment of the invention and the circuit theory diagrams of chaos encryption device.
(5) embodiment
As shown in Figure 1, message recipient three parts formed of information generator, information transfer channel 3, traditional decryption stage 4 and the 5 mutual cascades of Chaotic Solution level of confidentiality be made up of chaos encryption level 1 and the 2 mutual cascades of conventional cryptography level of the present invention constitute jointly.
As shown in Figure 2, the output signal of information source 6 and closed loop chaotic key generator 7 is delivered to chaos encryption device 8, the coded signal of closed loop chaotic key generator 7 produced simultaneously synchronizing signals 9 and 8 outputs of chaos encryption device is delivered to information synthesizer 10, the output signal of information synthesizer 10 is delivered to phasor converter 11, the output signal of phasor converter 11 is delivered to A/D converter 12, and the output signal of A/D converter 12 and random number key 13 are delivered to conventional cryptography device 14 respectively; The output signal of conventional cryptography device 14 is by information transfer channel 3, and and random number key 16 is delivered to traditional decipher 15 together, the output signal of tradition decipher 15 is delivered to D/A converter 17, the output signal of D/A converter 17 is delivered to phasor converter 18, the output signal of phasor converter 18 is delivered to information decomposition device 19, the output signal of information decomposition device 19 is delivered to chaos decode device 22, export synchronizing signal 20 simultaneously and deliver to closed loop chaotic key generator 21, the output signal of closed loop chaotic key generator 21 is also delivered to chaos decode device 22, and the output signal of chaos decode device 22 is an information source 23.
As shown in Figure 3, in the closed loop chaotic key generator and chaos encryption device of combination, the output signal of linear circuit chain 24 is delivered to unidirectional coupler 25, and the output signal of unidirectional coupler 25 is delivered to nonlinear circuit chain 26, and the output signal of nonlinear circuit chain 26 is transmitted back to linear circuit chain 24 again.
As shown in Figure 4, linear circuit chain 24 is electrically connected jointly by loss resistance R, the capacitor C 1 of voltage follower A1, resistance R 1, inductance L, inductance and constitutes; Unidirectional coupler 25 is made up of voltage follower A2; Nonlinear circuit chain 26 is electrically connected jointly by adder M, transmission coefficient K, voltage follower A3, resistance R 2, NONLINEAR NEGATIVE RESISTANCE NR and capacitor C 2 and constitutes.
Operation principle of the present invention is: the key signal that unencrypted information source 6 and closed loop chaotic key generator 7 produce is delivered to chaos encryption device 8 together and is carried out encryption, closed loop chaotic key generator 7 produces synchronizing signal 9 simultaneously, the output signal of synchronizing signal 9 and chaos encryption device 8 is modulated editor through a kind of information synthesizer 10 with single-pole double throw timing switch function, output continuity chaos encryption signal, handle through follow-up phasor converter 11, make the chaos encryption signal have stronger randomness; The A/D converter 12 that continuity chaos encryption signal is delivered in the conventional cryptography level carries out the discrete digital processing, become the digital signal of chaos encryption, information source as conventional cryptography device 14, carrying out conventional cryptography together with random number key 13 in conventional cryptography device 14 handles, its output is as the coded signal of information generator, be sent to message recipient through information transfer channel 3, the decryption information source for the treatment of as traditional decipher 15, and in traditional decipher 15, be decrypted processing with random number key 16, only contained the discrete digital signal that chaos is encrypted, be reduced to continuity chaos encryption signal through D/A converter 17, carry out the contrary processing of randomness deciphering through phasor converter 18 again, deliver to information decomposition device 19 then and carry out signal decomposition operation, its output signal is delivered to chaos decode device 22 on the one hand, 20 of the synchronizing signals that decomposites are on the other hand delivered to closed loop chaotic key generator 21, make it to produce the chaotic key signal and deliver to chaos decode device 22, through chaos decode device 22 decryption processing, restore the information source 23 of having deciphered.
In the present invention, the closed loop chaotic key generator of combination and the circuit working principle of chaos encryption device are: inductance L, the loss resistance R of inductance, the oscillating circuit that capacitor C 1 is formed is by the unidirectional couplings effect of voltage follower A2, with resistance R 2, capacitor C 2 is formed damped vibraion, its oscillating voltage is applied on the voltage-controlled NONLINEAR NEGATIVE RESISTANCE NR, produce the chaotic oscillation signal at the relevant parameters section, this signal is by voltage follower A1, the closed loop feedback of resistance R 1, be transmitted back to above-mentioned inductance L tank again as new input, the result is that track cycle of oscillation of chaos attractor is unpredictable; The independent adjustable fork parameter wherein of resistance R 1, R2, and the state and the pattern of transmission coefficient K value may command circuit less than 1, generation be two scroll chaotic signals, voltage follower A1～A3 plays the effect that improves input impedance and reduce output impedance; The method that this circuit utilizes unidirectional couplings and closed loop to combine, unencrypted information source S (t) inserts through adder M, realizes the Chaos Modulation to information, and the chaos encryption signal can be drawn from the node between resistance R 2 and the NONLINEAR NEGATIVE RESISTANCE NR.This improved hardware closed-loop cai's circuit also can expand among the application of two-stage closed loop cascade on demand.
The inventor is through development test, think and realize that optimal way of the present invention can be: (1) presses the consideration of structural relation shown in Fig. 1 and 2 and each parts of design baseband system, wherein, information synthesizer, information decomposition device adopt integrated circuit 4051 types, A/D converter ADS8322 type, D/A converter DAC7641 type, conventional cryptography device, traditional decipher can be realized with typical block cipher DES algorithm, phasor converter using n level shift operation nonlinear function is realized, with p (t) expression useful information, k (t) represents key information, and then transformation relation is
Inverse transformation is closed
(2) mix pure key generator and chaos encryption device as the combination closed loop of the embodiment of the invention, shown in Fig. 3 and 4, circuit board manufacturing, and screening components and parts, for example, voltage follow can be used the TL082 type with device A1～A3, and adder M can use AD712 type amplifier, transmission coefficient K can use divider resistance, and NR is the Cai Shi diode; Carry out circuit board by annexation shown in Figure 4 connection is installed, and power up debugging and test, just can implement the present invention preferably.
Claims (2)
1. the cascaded message encryption system of chaos encryption and conventional cryptography performance complement is characterized in that it is interconnected by information generator, information transfer channel and message recipient three parts forms; Wherein, information generator is made up of chaos encryption level and the mutual cascade of conventional cryptography level, and message recipient is made up of traditional decryption stage and the mutual cascade of Chaotic Solution level of confidentiality; The chaos encryption level of described information generator is made of jointly information source, closed loop chaotic key generator, chaos encryption device, information synthesizer, phasor converter, wherein, information source is connected with the chaos encryption device by output signal line with closed loop chaotic key generator, closed loop chaotic key generator is connected with the information synthesizer by synchronous signal line simultaneously, the chaos encryption device is connected with the information synthesizer by encrypting output signal line, and the information synthesizer is connected with the phasor converter by output signal line; The conventional cryptography level of described information generator is made of jointly A/D converter, random number key, conventional cryptography device, and wherein, the A/D converter is connected with the conventional cryptography device by output signal line respectively with the random number key; Traditional decryption stage of described message recipient is made of jointly random number key, traditional decipher, D/A converter, and wherein, the random number key is connected with traditional decipher, and traditional decipher is connected with the D/A converter by output signal line; The Chaotic Solution level of confidentiality of described message recipient is made of jointly phasor converter, information decomposition device, closed loop chaotic key generator, chaos decode device, information source, wherein, the phasor converter is connected with the information decomposition device by output signal line, the information decomposition device is connected with the chaos decode device by output signal line, be connected with closed loop chaotic key generator by synchronous signal line simultaneously, closed loop chaotic key generator also is connected with the chaos decode device by output signal line, and the output signal of chaos decode device is an information source; The phasor converter of chaos encryption level is connected with the A/D converter of conventional cryptography level by output signal line, the conventional cryptography device of conventional cryptography level is connected with traditional decipher of traditional decryption stage by information transfer channel, and the D/A converter of traditional decryption stage is connected with the phasor converter of Chaotic Solution level of confidentiality by output signal line.
2. the cascaded message encryption system of a kind of chaos encryption according to claim 1 and conventional cryptography performance complement, it is characterized in that, described closed loop chaotic key generator and chaos encryption device can be combined, the circuit that is connected to form jointly by linear circuit chain, unidirectional coupler, nonlinear circuit chain substitutes, wherein, the linear circuit chain is connected with unidirectional coupler by output signal line, unidirectional coupler is connected with the nonlinear circuit chain by output signal line, and the nonlinear circuit chain is connected with the linear circuit chain by output signal line again; The linear circuit chain is electrically connected jointly by loss resistance R, the capacitor C 1 of voltage follower A1, resistance R 1, inductance L, inductance and constitutes; Unidirectional coupler is made up of voltage follower A2; The nonlinear circuit chain is electrically connected jointly by adder M, transmission coefficient K, voltage follower A3, resistance R 2, NONLINEAR NEGATIVE RESISTANCE NR and capacitor C 2 and constitutes.
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| CNB021497931A CN1322693C (en) | 2002-12-31 | 2002-12-31 | Cascading information encryption system by complemented capabilities of chaos encryption and traditional encryption |
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| CNB021497931A CN1322693C (en) | 2002-12-31 | 2002-12-31 | Cascading information encryption system by complemented capabilities of chaos encryption and traditional encryption |
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| CN1322693C true CN1322693C (en) | 2007-06-20 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1713567B (en) * | 2004-09-24 | 2010-04-28 | 广州同应信息科技有限公司 | Setting and usage method of mapping cipher |
| CN1645781B (en) * | 2004-01-19 | 2011-06-22 | 广东工业大学 | Multi-path information encrpted chaotic communicating system |
| CN100534030C (en) * | 2005-10-17 | 2009-08-26 | 浙江大学 | Output-cryptograph mixed feedback chaos stream cipher encrypting and decrypting method |
| CN100486154C (en) * | 2005-10-19 | 2009-05-06 | 中国科学院数学与系统科学研究院 | Fourth-order network multi ring surface chaos circuit and its use method |
| CN111934844B (en) * | 2020-07-03 | 2022-06-07 | 太原理工大学 | Chaotic synchronous secret communication system and method based on double closed-loop feedback reserve pool calculation |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5479513A (en) * | 1994-11-18 | 1995-12-26 | Martin Marietta Energy Systems, Inc. | Fast and secure encryption-decryption method based on chaotic dynamics |
| CN1093708C (en) * | 2000-12-20 | 2002-10-30 | 华中科技大学 | Encryption/decryption system for information security |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5479513A (en) * | 1994-11-18 | 1995-12-26 | Martin Marietta Energy Systems, Inc. | Fast and secure encryption-decryption method based on chaotic dynamics |
| CN1093708C (en) * | 2000-12-20 | 2002-10-30 | 华中科技大学 | Encryption/decryption system for information security |
Non-Patent Citations (1)
| Title |
|---|
| 混沌保密通信的若干问题及混沌加密新方案 丘水生，陈艳峰，吴敏，马在光，禹思敏，刘雄英，华南理工大学学报，第30卷第11期 2002 * |
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