CN1055341C

CN1055341C - Copy-proof chaos software security card

Info

Publication number: CN1055341C
Application number: CN94106885A
Authority: CN
Inventors: 童勤业
Original assignee: Zhejiang University ZJU
Current assignee: Zhejiang University ZJU
Priority date: 1994-06-28
Filing date: 1994-06-28
Publication date: 2000-08-09
Anticipated expiration: 2014-06-28
Also published as: CN1116341A

Abstract

The present invention discloses a copy-proof chaos software security card which is composed of a crystal oscillator A, a logic circuit B, a control circuit C, a mapping and coarse granulation circuit D, an analog circuit E, a password forming circuit F and an interface circuit I/O. Instructions emitted by a computer are transmitted to the control circuit C by an I/O circuit, the C switches on or switches off a switch in the E according to the transmitted instructions, the E outputs chaos signals to the D, the chaos signals are mapped according to the instructions transmitted by the D, the chaos signals are coarsely granulated to be transmitted to the F and to the I/O interface circuit, and password signals are transmitted to the computer by the I/O circuit. The present invention has the advantages of easy manufacture, low cost, copy-proof analog signal property and strong digital signal interference rejection.

Description

Not reproducible proof chaos software security card

The present invention relates to sector card, especially relate to not reproducible proof chaos software security card.

Current popular confidentiality of computer software card both at home and abroad all is the digital circuit that adopts GAL and so on, produce that digital password realizes maintaining secrecy, but though these card inside tape counters, storeies etc. are formed all dynamic random ciphers, but these password cards always can be decrypted or duplicate by logic analysis.

The purpose of this invention is to provide a kind of not reproducible proof chaos software security card that utilizes chaotic signal to be used as specific cryptosystem.

Elaborate below in conjunction with accompanying drawing.

Fig. 1 is the system chart of not reproducible proof chaos software security card;

Fig. 2 is " chaos " signal generating circuit schematic diagram of not reproducible proof chaos software security card;

Fig. 3 is the coarse and the mapping circuit schematic diagram of not reproducible proof chaos software security card.

Not reproducible proof chaos software security card by crystal oscillator A, logic circuit B, Control circuit C, mapping and coarse circuit D, analog circuit E, password form circuit F and Interface circuit I/O forms. Computer sends instruction, is sent to control circuit C through the I/O circuit, C sends control instruction by transmitting instruction to B, logic circuit B go out according to the control instruction of C or Close K switch among the E₁、K ₂, then in capacitor C₁And C₂Both end voltage V_c1、V _c2Become the chaos letter Number, E exports chaotic signal to D, and D sends instruction here by C, chaotic signal is shone upon coarse grain Change, then the signal behind the coarse is delivered to password and forms circuit F, in F, form password After deliver to the I/O interface circuit, code signal is delivered to computer through I/O.

Crystal oscillating circuit A, logic circuit B and analog circuit E form chaotic signal electricity take place The road. Crystal oscillating circuit A sends clock pulses, and logic circuit B sends here by control circuit C K switch is determined in instruction₁、K ₂Rule, work as K₁During disconnection, dc source V_oThrough resistance R₁To capacitor C₁K is worked as in charging₁During connection, capacitor C₁Through K switch₁, resistance R₃Discharge. Meanwhile, Work as K switch₂During disconnection, power supply V_oThrough resistance R₁、R ₂With inductance L to capacitor C₂K is worked as in charging₂During connection, electric capacity is through K switch₂And resistance R₄Discharge. Because K₁And K₂Constantly change, make capacitor C₁、C ₂Both end voltage V_c1、V _c2Be chaos state.

Mapping and coarse circuit D, as shown in Figure 3, V _C1Or V _C2Signal is through sampling switch K ₃Sampling by the f frequency becomes discrete { W _iSequence, { W _iAnd reference voltage V _aIn comparer G, obtain comparison, work as W _i＜V _aThen G exports V _OutFor low level (being called 0 state), work as W _i＞V _aV then _OutBe high level (being called 1 state), V _aBe supply voltage V _cThrough resistance R ₅, R ₆Dividing potential drop obtains.

Control circuit C, it is the order of accepting interface I/O, gives B signal regulation K ₁, K ₂Switching sequence is given an order, and gives mapping and coarse circuit D; Regulation is to get V _C1Signal is still got V _C2Signal, decision sampling switch K ₃Switch periods; Also form circuit F regulation password generation type and parameter simultaneously to password.

Password forms circuit F, and its function is in 0,1 sequence of E output, gets by the instruction of C that a part becomes password in 0,1 sequence, flows to I/O.

Interface circuit I/O can be divided into two kinds, and a kind of is that sector card is connected on computing machine serial port place, joins with standard RS-232 mouth and computing machine; Another kind also can with and line output be inserted on the expanded slot of computer, adopt bus standard and computing machine on the computing machine to link.Its function is to accept the signal of computing machine, gives control circuit C, in addition the signal from F is become standard signal and flows to computing machine.

The time slot scrambling of this card is also inequality with the time slot scrambling of existing card.

Concrete grammar is: one section encipheror at first will be arranged in computing machine; this section program is inserted in the software of need to be keep secret; at first artificially import Several Parameters in this software, this Several Parameters has determined mapping mode, coarse mode and has got which part 0,1 sequence to form password.

After being started this section program by security software, can obtain a string 0,1 password, then these passwords be existed by in the software of maintaining secrecy, need to use this to be maintained secrecy so afterwards from I/O

During program, can automatically start encipheror, then from card get on to read 0,1 password, if identical with the password deposited in the program then carry out this program, otherwise executive routine not just, thus reach the software privacy purpose.

The interface circuit here, control circuit all adopt routine techniques in the computer hardware, have no longer specifically introduced.

The circuit of sector card also can be simplified, and also can increase element or loop again, also can add the electronic component of other stable performance, as piezoelectric crystal etc.

Here the coarse method also can be various, is (0,1) with two-value here, and is also available many-valued, as three values (0,1,2).

When security requirements is low, can be with some element of some poor stabilities, element stability is high more, and privacy degrees is just high more.

Advantage of the present invention is:

1. owing to adopted chaos technology, the chaotic signal that makes each piece card all is unique, and is not reproducible, so confidentiality is very strong.

2. make easily, cost is very low, can produce the very strong sector card of confidentiality with low price very.

3. promptly have the not reproducible advantage of simulating signal, have the strong advantage of digital signal antijamming capability again.

4. chaotic signal can not be by decodings such as logic analysers.

Claims

1. not reproducible proof chaos software security card; it is characterized in that it forms circuit F and interface circuit I/O by crystal oscillator A, logical circuit B, control circuit C, mapping and coarse circuit D, mimic channel E, password and forms computing machine and send instruction; be sent to control circuit C through the I/O circuit; C sends steering order by transmitting instruction to B; logical circuit B goes to open or close K switch among the E according to the steering order of C ₁, K ₂, then in capacitor C ₁And C ₂Both end voltage V _C1, V _C2Become chaotic signal; E exports chaotic signal to D, and D sends instruction here by C chaotic signal is shone upon coarse, then signal conveys behind the coarse is formed circuit F to password; deliver to the I/O interface circuit form password in F after, code signal is delivered to computing machine through I/O.

2. a kind of not reproducible proof chaos software security card according to claim 1, it is characterized in that said crystal oscillating circuit A, logical circuit B and mimic channel E form chaotic signal generating circuit, crystal oscillating circuit A sends time clock, and logical circuit B determines K switch by the instruction that control circuit C sends here ₁, K ₂Rule, work as K ₁During disconnection, direct supply V _oThrough resistance R ₁To capacitor C ₁K switch is worked as in charging ₁During connection, capacitor C ₁Through K switch ₁, resistance R ₃Discharge meanwhile, is worked as K switch ₂During disconnection, power supply V _oThrough resistance R ₁, R ₂With inductance L to capacitor C ₂K is worked as in charging ₂During connection, capacitor C ₂Through K switch ₂And resistance R ₄Discharge is because K ₁And K ₂Constantly change, make capacitor C ₁, C ₂Both end voltage V _C1, V _C2Be chaos state.

3. a kind of not reproducible proof chaos software security card according to claim 1 and 2 is characterized in that said mapping and coarse circuit D are by V _C1, V _C2Signal is through sampling switch K ₃Carry out { the W that switch must disperse by the f frequency _iSequence, { W _iAnd reference voltage V _aIn comparer G, obtain comparison, work as W _i＜V _aThen G exports V _OutFor low level (being called the O state), work as W _i＞V _aV then _OutBe high level (being called 1 state), V _aBe supply voltage V _oThrough resistance R ₅, R ₆Dividing potential drop obtains.