CN113484281B - Optical encryption device and method based on unique light scattering characteristics of biological tissues - Google Patents
Optical encryption device and method based on unique light scattering characteristics of biological tissues Download PDFInfo
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Abstract
The invention belongs to the crossing field of optical information processing and optical image encryption; the optical encryption technology based on the light scattering characteristic of the biological tissue enables the autocorrelation function of a ciphertext and the autocorrelation function of a plaintext to be approximately equal, an encryption system is easy to be attacked by a full ciphertext by using a phase recovery algorithm, and the security is greatly threatened; the invention provides an optical encryption device and method based on unique light scattering characteristics of biological tissues, wherein a dynamic scattering medium 2 is used as a random phase mask and is arranged between a projection input device and an area array photoelectric detector to form an encryption system, a key is recorded by utilizing irrelevant characteristics of the dynamic scattering medium, the attack of a system full ciphertext can be effectively resisted, the biological tissues are combined with a novel optical encryption method, the safety coefficient is high, the encryption and decryption are realized by using an algorithm, the method is more flexible, the method can be widely applied to encryption processing of video images, and the encryption and decryption efficiency is high.
Description
Technical Field
The invention relates to the crossing field of optical information processing and optical image encryption, in particular to an optical encryption device and method based on unique light scattering characteristics of biological tissues.
Background
The optical encryption technology is an information encryption technology based on an optical theory and method, and has attracted extensive attention and research due to the advantages of large information capacity, strong security, high encryption efficiency and the like. The optical encryption technology based on the unique light scattering characteristic of the biological tissue is carried out in the range of optical memory effect, so that the autocorrelation function of a ciphertext is approximately equal to the autocorrelation function of a plaintext, the encryption system is easy to be attacked by a full ciphertext using a phase recovery algorithm, and the safety of the system is greatly threatened.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an optical encryption device and method based on the unique light scattering property of biological tissues, wherein the invention fully utilizes the irrelevant property of a dynamic scattering medium to record different keys so as to increase the safety, and has high encryption and decryption efficiency and wider application range.
In order to realize the purpose, the invention provides the following technical scheme:
an optical encryption device based on unique light scattering characteristics of biological tissues comprises a projection input device, a dynamic scattering medium, an area array photoelectric detector and a microprocessor, wherein the microprocessor is used for generating a plaintext and finishing ciphertext algorithm processing, the dynamic scattering medium is arranged between the projection input device and the area array photoelectric detector, and signals of the projection input device and the area array photoelectric detector are connected with the microprocessor.
Further, the distance between the dynamic scattering medium and the projection input device is larger than the distance between the dynamic scattering medium and the area array photoelectric detector.
An optical encryption method based on unique light scattering characteristics of biological tissues is characterized in that based on the optical encryption device, a dynamic scattering medium is used as a random phase mask and is arranged between a projection input device and an area array photoelectric detector to form an encryption system, a plaintext P to be encrypted is input into the encryption system, and is converted into a speckle pattern similar to noise through the scattering effect of the dynamic scattering medium to complete encryption operation, and the method specifically comprises the following steps:
and step 3, decryption: and (4) carrying out deconvolution operation on the ciphertext obtained in the step (2) to obtain a plaintext.
Further, the key in step 1 performs a decorrelation characteristic operation, specifically adopting the following method:
wherein the content of the first and second substances,
the key is organized for the first sample and,
a key is organized for the second sample,: | represents a cross-correlation operation, δ represents a pulse function, S 1 Is a first sample organization, S 2 A second sample tissue;
wherein the content of the first and second substances,
a key is organized for the first slice sample,
for the second slice sample tissue Key, sk 1 For the first slice sample texture, sk 2 (ii) a second sliced sample tissue;
wherein the content of the first and second substances,
representing the same tissue and the same section T 1 The key at the time of day is,
representing the same tissue and the same section T 2 Key at time, ST 1 T representing the same section of the same tissue 1 Time of day, ST 2 T representing the same section of the same tissue 2 The time of day.
Further, the convolution encryption calculation formula in step 2 is as follows:
I＝O*PSF (4)
wherein, I is speckle generated on the output plane by the light emitted from the plaintext passing through the dynamic scattering medium, O is the intensity function of the plaintext, PSF is the key of the dynamic scattering medium, and x represents convolution operation.
Further, the convolution encryption specifically adopts the following encryption method:
an encryption method 1, carrying out convolution encryption on the complete plaintext and the secret key in the step 1 to form a speckle ciphertext, and finishing encryption operation;
Further, the decryption deconvolution operation in step 3 specifically adopts the following decryption method:
the decryption method 1. The complete ciphertext and the corresponding key are subjected to deconvolution operation to obtain a complete plaintext before encryption, and decryption is completed;
and (2) carrying out deconvolution operation on all speckle ciphertexts and corresponding keys to obtain all parts of plaintext, superposing all parts of plaintext to obtain complete plaintext, and finishing decryption.
In conclusion, the invention has the following beneficial effects:
the invention fully utilizes the irrelevant characteristic of the dynamic scattering medium, adopts the optical encryption device and the method based on the unique light scattering characteristic of the biological tissue, and has the following advantages:
1. the encryption device is simple, so that the requirement on the alignment of an encryption system is low, and the installation and the alignment of a light path are convenient;
2. the invention can effectively resist the attack of the system full ciphertext, and has high safety factor by combining biological tissues with a novel optical encryption method;
3. the point spread function which is recorded in advance and is irrelevant to physics and random is convoluted with the plaintext, so that the information is encrypted, and the simplicity and convenience of encryption are ensured;
4. the encryption and decryption can be realized by using an algorithm, so that the method is more flexible and has wider application range;
5. the encryption and decryption efficiency is high.
Drawings
FIG. 1 is a schematic view of an apparatus of the present invention;
FIG. 2 is an encryption and decryption process based on different biological tissues;
FIG. 3 is a diagram of the encryption and decryption process based on different slices of onion skin tissues;
FIG. 4 is an image based on a full cipher text attack under different speckles;
FIG. 5 is a process for encrypting and decrypting part of plaintext based on onion skin organization.
In the figure: 1. the device comprises a projection input device 2, a dynamic scattering medium 3, an area array photoelectric detector 4 and a microprocessor.
FIG. 2 (a) Green onion skin organization Key
FIG. 2 (b) cipher text of onion skin tissue, FIG. 2 (c) image of onion skin tissue decryption, FIG. 2 (d) chicken tissue key
Fig. 2 (e) chicken tissue ciphertext, and fig. 2 (f) chicken tissue decipher image.
FIG. 3 (a) first slice organization Key
FIG. 3 (b) first slice organization ciphertext, FIG. 3 (c) first slice organization decrypted image, FIG. 3 (d) second slice organization key
Fig. 3 (e) second slice organization cipher text, fig. 3 (f) second slice organization decryption image.
Fig. 4 (a) shows an image in which the ciphertext of the onion skin tissue of fig. 2 (b) is subjected to ciphertext-wide attack, fig. 4 (b) shows an image in which the ciphertext-wide attack is performed on the chicken tissue of fig. 2 (e), fig. 4 (c) shows an image in which the ciphertext-wide attack is performed on the first slice tissue of the onion skin of fig. 3 (b), and fig. 4 (d) shows an image in which the ciphertext-wide attack is performed on the second slice tissue of the onion skin of fig. 3 (e).
FIG. 5 (a) original plaintext, FIG. 5 (b) T 1 At a time
(c)T 2 At any moment
Fig. 5 (e) to (i) shows a part of plaintext under random sampling of the onion skin sample, fig. 5 (g) to (n) shows a corresponding ciphertext obtained by encrypting the onion skin sample, fig. 5 (o) to(s) shows a part of plaintext obtained by decrypting the onion skin sample, and fig. 5 (d) shows a plaintext obtained by superimposing all parts of plaintext.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in figures 1-5, the invention discloses an optical encryption device based on unique light scattering characteristics of biological tissues, which comprises a projection input device 1, a dynamic scattering medium 2, an area array photoelectric detector 3 and a microprocessor 4 for generating plaintext and completing ciphertext algorithm processing, wherein the dynamic scattering medium 2 is arranged between the projection input device 1 and the area array photoelectric detector 3, signals are transmitted from the projection input device 1 to the area array photoelectric detector 3 in a one-way mode through the dynamic scattering medium 2, the distance between the dynamic scattering medium 2 and the projection input device 1 is greater than that between the dynamic scattering medium 2 and the area array photoelectric detector 3, in the embodiment shown in figure 1, the distance between the projection input device 1 and the dynamic scattering medium 2 is 125mm, the distance between the area array photoelectric detector 3 and the dynamic scattering medium 2 is 100mm, the signals of the projection input device 1 and the area array photoelectric detector 3 are both connected with the microprocessor 4, the microprocessor 4 generates plaintext to be encrypted, the plaintext is projected to the dynamic scattering medium 2 through the projection input device 1 for encryption, the ciphertext is received by the photoelectric detector 3, and the microprocessor 4 performs subsequent algorithm processing.
The projection input device 1 can be selected to use DMD, LEDarray, LC-CMOS or the like as core components to realize the projection input function, the dynamic scattering medium 2 can be selected from natural dynamic scattering media, the static scattering medium can be manually translated or rotated to generate artificial dynamic change, and the area array photoelectric detector 3 can be selected from CCD or SCMOS or the like.
The invention also discloses an optical encryption method based on the unique light scattering characteristic of the biological tissue, based on the optical encryption device, a dynamic scattering medium 2 is used as a random phase mask and is arranged between a projection input device 1 and an area array photoelectric detector 3 to form the optical encryption device in the figure 1 to form an encryption system, then a plaintext P to be encrypted is input into the encryption system, and is converted into a speckle pattern similar to noise through the scattering effect of the dynamic scattering medium to complete the encryption operation, and the method specifically comprises the following steps:
The key performs a decorrelation characteristic operation, specifically in the following manner:
The convolution encryption specifically adopts the following encryption method:
an encryption method 1, carrying out convolution encryption on the complete plaintext and the secret key in the step 1 to form a speckle ciphertext and finishing encryption operation;
an encryption method 2, the original plaintext P to be encrypted is subjected to space two-dimensional random incomplete full sampling to obtain partial plaintext P i Namely:
and performing convolution encryption on all parts of plaintext and the key in the step 1 to form a plurality of speckle ciphertexts, and finishing encryption operation.
And step 3, decryption: and (4) carrying out deconvolution operation on the ciphertext obtained in the step (2) to obtain a plaintext.
When the speckle formed by the light emitted by an object when the light penetrates through the dynamic scattering medium is deconvoluted with the key with the same structural characteristics, the object can be reconstructed; when the key with different structural characteristics and the speckle are used for deconvolution operation, the original object cannot be reconstructed, and the decryption deconvolution operation specifically adopts the following decryption method:
and (3) carrying out deconvolution operation on the complete ciphertext and the corresponding key to obtain a complete plaintext before encryption, and completing decryption.
And (2) carrying out deconvolution operation on all speckle ciphertexts and corresponding keys to obtain all parts of plaintext, superposing all parts of plaintext to obtain complete plaintext, and finishing decryption.
The decryption method 1 is used for decrypting the encrypted ciphertext through the encryption method 1, and the decryption method 2 is used for decrypting the encrypted ciphertext through the encryption method 2; the dynamic scattering medium based on the light scattering characteristic of the biological tissue can effectively resist attack of the full ciphertext and has high safety.
The first embodiment is as follows:
and (3) selecting the mode 1 in the step (1) to record the key, projecting a point light source on an input plane by a software control microprocessor and a projection input device, carrying out phase modulation on light emitted by the point light source after entering a dynamic scattering medium through a scattering effect, and finally forming speckles on an output plane to be received by an area array photoelectric detector. In which different dynamic scattering media are ensuredThe method can select a biological tissue sample as a dynamic scattering medium to obtain the secret key, in this embodiment, a scallion skin sample and a chicken sample are selected, the two biological tissue samples are respectively sliced and placed at the position of the dynamic scattering medium 2 shown in fig. 1 as the dynamic scattering medium, and the secret keys of the two corresponding biological tissues are recorded
As shown in FIGS. 2 (a) and
as shown in fig. 2 (d), in this embodiment, the key of the biological tissue of the fresh onion skin sample is shown in fig. 2 (a), and the key of the biological tissue of the chicken sample is shown in fig. 2 (d), and since the decorrelation time of the biological tissue is usually tens of seconds or even hundreds of seconds, which will affect the efficiency of online encryption using an optical device, when the biological tissue is used as a dynamic scattering medium, an offline encryption method is preferred, in this embodiment, the encryption method 1 in step 2 is selected, the whole plaintext to be encrypted and the keys of different biological tissues are transmitted to the microprocessor 4 for algorithm processing, and the plaintext is encrypted by the formula (4), so that the corresponding speckle ciphertext can be obtained, as shown in fig. 2 (b) and fig. 2 (e). When decryption is performed, the decryption mode in step 3 is selected, i.e., the inverse operation of formula (4) can be directly performed on the key and the speckle ciphertext by using the deconvolution algorithm, so that the decryption operation can be realized as shown in fig. 2 (c) and fig. 2 (f), wherein the upper right corners of the two pictures are the original plaintext patterns.
Fig. 2 shows that no matter what kind of biological sample is used as the dynamic scattering medium, the plaintext can be effectively encrypted, and converted into seemingly disordered speckles, and when the point spread function of the system is used as the secret key, the plaintext can be effectively decrypted.
Example two:
and (3) selecting the mode 2 in the step (1) to record the key, and selecting different slices of the same fresh onion skin sample as the dynamic scattering medium to ensure the irrelevant characteristics of the dynamic scattering medium. Due to the anisotropy of the internal structure of the dynamic scattering medium, i.e. different slices of the same dynamic scattering mediumThere are different structural characteristics with which the decorrelated key can be recorded. In this embodiment, two slices of the same onion skin tissue are selected, and the keys of the two slices are recorded respectively
As shown in FIGS. 3 (a) and
as shown in fig. 3 (d). Then, using an algorithm to perform convolution encryption, in this embodiment, the encryption still selects the encryption method 1 in step 2, and using the formula (4) to perform convolution encryption on the plaintext, so as to obtain a corresponding ciphertext as shown in fig. 3 (b) and 3 (e), and then, using the decryption method 1 in step 3 to perform deconvolution operation on the corresponding ciphertext, so as to reproduce the original plaintext as shown in fig. 3 (e) and 3 (f).
As can be seen from the analysis of fig. 3, different slices of the same biological tissue can also be used as dynamic scattering media to implement the operations of encrypting and decrypting the picture information.
Example three:
and (2) selecting the mode 3 recording secret key in the step (1), and selecting the slices in the same area of the same fresh onion skin sample as the scattering medium in order to ensure the uncorrelated characteristics of the dynamic scattering medium, wherein the internal structure of the scattering medium is changed constantly along with time, so that the scattering medium has the natural decorrelation characteristic along with the time structure. When the time interval between two adjacent sampling times in the onion skin tissue needs to be more than 60s, the decorrelation characteristic between the keys can be ensured, namely recording
As in fig. 5 (b), record after 120s interval
As shown in fig. 5 (c). Then, an encryption operation is performed, and an encryption method 2 is selected in this embodiment. In most optical encryption methods based on scattering media, the plaintext to be encrypted is not processed before being input into an encryption system, that is, only one speckle ciphertext is generated correspondingly for one plaintext. While the autocorrelation function of the ciphertext and the autocorrelation function of the plaintext are approximately equal, i.e., the attackerUnder the condition of mastering the ciphertext, the plaintext can be reconstructed by using a phase recovery algorithm, so that the system security is greatly threatened. Random non-repeated full sampling is carried out on the plaintext by using an encryption method 2, and the plaintext P to be encrypted is divided into a plurality of partial plaintext pictures P containing partial information of the plaintext P by using a formula (5) i As shown in fig. 5 (e) -5 (i), where the random number of samples n =115, the key and P are then pair using equation (4) i A series of corresponding speckle ciphertexts can be obtained by convolution operation, as shown in fig. 5 (g) -5 (n), that is, a plaintext picture is encrypted into a series of ciphertext pictures. And finally, decrypting, namely selecting the decryption method 2 in the step 3, performing inverse operation of a formula (4) on the key and a series of speckle ciphertexts to decrypt a series of partial plaintext as shown in a figure 5 (o) -a figure 5(s), and overlapping 115 partial plaintext to obtain an original plaintext picture as shown in a figure 5 (d).
The analysis of fig. 5 shows that the point spread function changes along with the time lapse of the slices in the same area of the same fresh onion skin sample, the corresponding keys are different, the encryption of the optical image can be realized by utilizing the characteristic, and meanwhile, the problem of attack of the full ciphertext by utilizing the phase recovery algorithm is solved by combining the novel encryption mode of random sampling in the embodiment, so that the encryption safety performance is further improved.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (5)
1. An optical encryption method based on unique light scattering characteristics of biological tissues, which uses an optical encryption device based on unique light scattering characteristics of biological tissues, and is characterized in that: the optical encryption device comprises a projection input device (1), a dynamic scattering medium (2), an area array photoelectric detector (3) and a microprocessor (4) for generating a plaintext and finishing ciphertext algorithm processing, wherein the dynamic scattering medium (2) is arranged between the projection input device (1) and the area array photoelectric detector (3), and signals of the projection input device (1) and the area array photoelectric detector (3) are both connected with the microprocessor (4);
the method comprises the following steps of taking a dynamic scattering medium as a random phase mask, placing the random phase mask between a projection input device (1) and an area array photoelectric detector (3) to form an encryption system, inputting a plaintext P to be encrypted into the encryption system, converting the plaintext P into a speckle pattern similar to noise through the scattering effect of the dynamic scattering medium, and completing encryption operation, wherein the method specifically comprises the following steps:
step 1, obtaining a secret key: a point light source is projected at the center of an input plane by a projection input device (1), and a speckle pattern formed by an output plane of the encryption system at the moment is recorded by an area array photoelectric detector (3) after passing through a dynamic scattering medium (2), namely a key of the dynamic scattering medium used by the encryption system at the moment; the dynamic scattering medium (2) is dynamically changed and correspondingly records a key once, and the key is subjected to decorrelation characteristic operation to ensure that no correlation exists between the keys;
step 2, encryption: carrying out convolution encryption on a plaintext to be encrypted by utilizing a convolution algorithm through the key obtained in the step 1 to obtain a ciphertext;
and step 3, decryption: carrying out deconvolution operation on the ciphertext obtained in the step 2 to obtain a plaintext;
the key in step 1 performs decorrelation characteristic operation, specifically adopting the following mode:
mode 1. Different biological tissues are used as dynamic scattering media to record keys, and the cross-correlation operation of the keys between different biological tissues is calculated by the following formula:
wherein, the first and the second end of the pipe are connected with each other,
the key is organized for the first sample and,
a key is organized for the second sample,: | represents a cross-correlation operation, δ represents a pulse function, S 1 Is a first sample organization, S 2 A second sample tissue;
mode 2. Different slices of the same biological tissue are used as dynamic scattering medium to record the key, and the cross-correlation operation of the key between different slices is calculated by the following formula:
wherein the content of the first and second substances,
a key is organized for the first slice sample,
for the second slice sample tissue Key, sk 1 For the first slice sample texture, sk 2 (ii) a second sliced sample tissue;
mode 3. Using the same section of the same biological tissue as dynamic scattering medium, the section changes with time, different keys are recorded correspondingly at different time, the cross-correlation operation of the keys at different time is calculated by the following formula:
wherein the content of the first and second substances,
representing the same tissue and the same section T 1 The key at the time of day is,
representing the same tissue and the same section T 2 Key at time, ST 1 T representing the same section of the same tissue 1 Time of day, ST 2 T representing the same section of the same tissue 2 The time of day.
2. The method of claim 1, wherein the optical encryption method based on unique light scattering properties of biological tissue comprises: the distance between the dynamic scattering medium (2) and the projection input device (1) is larger than the distance between the dynamic scattering medium (2) and the area array photoelectric detector (3).
3. The optical encryption method based on unique light scattering properties of biological tissues as claimed in claim 1, wherein: the convolution encryption calculation formula in the step 2 is as follows:
I＝O*PSF
wherein, I is the speckle generated by the light emitted from the plaintext on the output plane through the dynamic scattering medium, O is the intensity function of the plaintext, PSF is the key of the dynamic scattering medium, and represents the convolution operation.
4. The optical encryption method based on unique light scattering properties of biological tissues as claimed in claim 1, wherein: the convolution encryption specifically adopts the following encryption method:
an encryption method 1, carrying out convolution encryption on the complete plaintext and the secret key in the step 1 to form a speckle ciphertext, and finishing encryption operation; encryption method 2. The plaintext is subjected to space two-dimensional random incomplete full sampling to obtain partial plaintext P i And performing convolution encryption on all parts of the plaintext and the key in the step 1 to form a plurality of speckle ciphertexts, and finishing the encryption operation.
5. The optical encryption method based on unique light scattering properties of biological tissues as claimed in claim 1, wherein: the decryption deconvolution operation in the step 3 specifically adopts the following decryption method:
the decryption method 1. The complete ciphertext and the corresponding key are subjected to deconvolution operation to obtain a complete plaintext before encryption, and decryption is completed; and (2) carrying out deconvolution operation on all speckle ciphertexts and corresponding keys to obtain all parts of plaintext, superposing all parts of plaintext to obtain complete plaintext, and finishing decryption.
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