CN116894273B - File encryption method, decryption method, equipment and medium based on exclusive or sum remainder - Google Patents
File encryption method, decryption method, equipment and medium based on exclusive or sum remainder Download PDFInfo
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- 238000004590 computer program Methods 0.000 claims description 3
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/60—Protecting data
- G06F21/62—Protecting access to data via a platform, e.g. using keys or access control rules
- G06F21/6209—Protecting access to data via a platform, e.g. using keys or access control rules to a single file or object, e.g. in a secure envelope, encrypted and accessed using a key, or with access control rules appended to the object itself
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/60—Protecting data
- G06F21/602—Providing cryptographic facilities or services
Abstract
The invention relates to the technical field of file encryption and decryption, and discloses a file encryption method, a file decryption device and a file decryption medium based on exclusive OR and remainder, wherein the file encryption method comprises the following steps: s1, designing a key library by using a random character string; s2, defining a first buffer byte array; s3, reading bytes to be read with the length of M from an original file to be encrypted according to the byte arrangement sequence into the first buffer byte array; s4, taking the remainder obtained by carrying out the residual operation on each byte in the first buffer byte array combined with the current position P of the original encrypted file stream and the maximum value Z of the bytes as an index to find a corresponding key for encryption in the key bank A; then performing exclusive-or operation to obtain an encrypted byte; s5, writing in sequence; s6, judging whether bytes to be read exist or not, if yes, jumping to S3, otherwise, jumping to S7; s7, ending the encryption process. The invention can quickly encrypt and decrypt files with large data quantity.
Description
Technical Field
The invention relates to the technical field of file encryption and decryption, in particular to a file encryption method, a file decryption device and a file medium based on exclusive or and remainder.
Background
In the modern society of the rapid development of information technology, information security plays an important role, and the cryptography is the guarantee and core of information security.
The cipher is used as secret information means, and the cipher coding system has two kinds of block cipher and stream cipher based on different plaintext processing modes, and the block cipher system is one traditional cipher system with great number of block ciphers, including DES variation, IDEA algorithm, SAFER series algorithm, RC series algorithm, etc.
The existing encryption and decryption methods are complex, if the content of the file is relatively large, the file needs more time in the encryption and decryption process, and the efficiency is very low, so that on the premise of ensuring confidentiality, a lightweight encryption and decryption method is needed to be designed to cope with the file with large data volume.
Disclosure of Invention
The invention provides a file encryption method, a file decryption device and a file decryption medium based on exclusive OR and remainder to solve the problems.
The invention is realized by the following technical scheme:
a file encryption method based on exclusive OR and remainder comprises the following steps:
s1, designing a key store A by using a random character string,a is a secret key in a secret key library, and n is the number of the secret keys;
s2, defining a first buffer byte array buffer1, wherein the byte length of the first buffer byte array buffer1 is M, and the byte length of the first buffer byte array buffer1 is determined according to external hardware configuration;
s3, clearing bytes in the first buffer byte array buffer1, reading bytes to be read with the length of M from an original file to be encrypted according to the byte arrangement sequence into the first buffer byte array buffer1, and after the bytes in the original file are read into the first buffer byte array buffer1, enabling the remaining unread bytes to be the bytes to be read;
s4, taking the remainder obtained by carrying out the residual operation on each byte in the first buffer byte array buffer1 combined with the current position P of the original encrypted file stream and the maximum value Z of the byte as an index to find a corresponding key for encryption in the key bank A; then, carrying out exclusive OR operation on each obtained secret key for encryption and the byte corresponding to the byte read into the first buffer byte array buffer1 in sequence to obtain encrypted bytes;
s5, sequentially writing the obtained encrypted bytes from the last bit of the last byte of the original encrypted file stream according to the sequence of the encrypted bytes to form a new original encrypted file stream;
s6, judging whether bytes to be read exist in the original file, if so, jumping to S3, otherwise, jumping to S7;
s7, the new original encrypted file stream is the encrypted file corresponding to the original file, and the encryption process is finished.
As optimization, the specific process of S1 is:
s1.1, defining a character string library by using random character strings;
s1.2, coding the character string library to obtain a key library A.
Preferably, the byte length of the character string library is not less than the byte maximum value Z, and the characters in the character string library comprise one or more of numbers, letters and Chinese characters.
As an optimization, in S1.2, the encoding of the string library may be performed by encrypting the string library by using utf-8 encoding or Unicode encoding.
As optimization, the specific steps of S4 are:
s4.1, acquiring the current position P of the original encrypted file stream;
s4.2, cycling the bytes in the first buffer byte array buffer1, and dividing each byte in the first buffer byte array buffer1 by a byte maximum value Z according to the (P+ byte position index) to obtain the remainder of each byte in the first buffer byte array buffer1, namely:
；
i is the i-th byte in the first buffer byte array buffer1,representing the remainder corresponding to the ith byte in the first buffer byte array buffer 1;
s4.3, respectively indexing the obtained residues to find corresponding keys for encryption in the key bank AThe numerical value of the remainder is the sequence number of the key;
s4.4, the obtained key for encryptionAnd performing exclusive OR operation on the byte correspondence read from the first buffer byte array buffer1 at this time in sequence to obtain an encrypted byte, namely an ith encrypted byte= (the byte in the ith first buffer byte array buffer 1) ≡j->。
The invention also discloses a file decryption method based on the exclusive or and the remainder, which decrypts the encrypted file encrypted by the file encryption method based on the exclusive or and the remainder, and comprises the following steps:
t1, defining a second buffer byte array buffer2, wherein the byte length of the second buffer byte array buffer2 is N, and the byte length of the second buffer byte array buffer2 is determined according to external hardware configuration;
t2, clearing bytes in the second buffer byte array buffer2, reading the encrypted bytes to be read with the length of N from the encrypted file to be decrypted according to the sequence of the encrypted bytes, and changing the remaining unread encrypted bytes into the encrypted bytes to be read after the encrypted bytes in the encrypted file are read into the second buffer byte array buffer 2;
t3, taking the remainder obtained by carrying out the residual operation on each encrypted byte in the second buffer byte array buffer2 combined with the current position K of the original decrypted file stream and the maximum value Z of the byte as an index to find a corresponding key for decryption in a key bank A; then, performing exclusive OR operation on each obtained secret key for decryption and the encrypted byte read into the second buffer byte array buffer2 at this time in sequence to obtain decrypted bytes;
t4, sequentially writing the obtained decryption bytes from the last bit of the last byte of the original decryption file stream according to the order of the decryption bytes to form a new original decryption file stream;
t5, judging whether the encrypted file contains the encrypted bytes to be read, if yes, jumping to T2, otherwise jumping to T6;
and T6, the new original decrypted file stream is the original file, and the decryption process is finished.
As optimization, the specific steps of T3 are:
t3.1, obtaining the current position K of the original decrypted file stream;
t3.2, cycling the encrypted bytes in the two-buffer byte array buffer2, and dividing each encrypted byte in the two-buffer byte array buffer2 by a byte maximum value Z according to (K+ the position index of the encrypted byte), so as to obtain the remainder of each encrypted byte in the two-buffer byte array buffer2, namely:
；
j is the j-th encrypted byte in the second buffer byte array buffer2,representing the remainder corresponding to the j-th encrypted byte in the second buffer byte array buffer 2;
t3.3, respectively indexing the remainder of the obtained plurality of encrypted bytes to find the corresponding key for decryption in the key bank AThe numerical value of the remainder of the encrypted byte is the sequence number of the key;
t3.4, key for decryption obtainedExclusive or operation is sequentially carried out on the byte correspondence read from the second buffer byte array buffer2 at this time to obtain decrypted bytes, namely, jth decrypted bytes= (encrypted bytes in the jth second buffer byte array buffer 2) ≡>。
As an optimization, the key store a used in T3 is the same key store as the key store a designed in the file encryption method based on the exclusive or and the remainder.
The invention also discloses an electronic device, which comprises at least one processor and a memory in communication connection with the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method as described above.
The invention also discloses a storage medium storing a computer program which, when executed by a processor, implements the method described above.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the file encryption method, decryption method, equipment and medium based on the exclusive OR and the remainder are simple in implementation method, and can quickly encrypt and decrypt files with large data volume on the premise of ensuring confidentiality.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings that are needed in the examples will be briefly described below, it being understood that the following drawings only illustrate some examples of the present invention and therefore should not be considered as limiting the scope, and that other related drawings may be obtained from these drawings without inventive effort for a person skilled in the art. In the drawings:
FIG. 1 is a flow chart of a file encryption method based on exclusive OR and remainder according to the present invention;
fig. 2 is a flowchart of a file decryption method based on exclusive or and remainder according to the present invention.
Description of the embodiments
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention.
A file encryption method based on exclusive or and remainder according to embodiment 1, as shown in fig. 1, includes:
s1, designing a key store A by using a random character string,a is a secret key in a secret key library, and n is the number of the secret keys;
the specific process is as follows:
s1.1, defining a character string library by using random character strings;
s1.2, encrypting the character string library to obtain a key library A, and encrypting a random character string library in the character string library by adopting the modes of utf-8, unicode and the like to obtain the key library, wherein the function is to convert the character strings in the key library into byte bytes. The byte length of the string library is not less than the byte maximum value Z, e.g., the byte maximum value Z is 255, then the byte length of the string library cannot be less than 255, and the characters in the string library include one or more of numbers, letters, and Chinese characters.
Since some deviation occurs when the byte length is greater than 255, the byte maximum value Z is 255 in this embodiment.
S2, defining a first buffer byte array buffer1, wherein the byte length of the first buffer byte array buffer1 is M, the byte length of the first buffer byte array buffer1 is determined according to external hardware configuration, such as 10k,
byte[] buffer 1= new byte[10*1024]。
s3, clearing bytes in the first buffer byte array buffer1, reading bytes to be read with the length of M from an original file to be encrypted according to the byte arrangement sequence into the first buffer byte array buffer1, and after the bytes in the original file are read into the first buffer byte array buffer1, enabling the remaining unread bytes to be the bytes to be read;
s4, taking the remainder obtained by carrying out the residual operation on each byte in the first buffer byte array buffer1 combined with the current position P of the original encrypted file stream and the maximum value Z of the byte as an index to find a corresponding key for encryption in the key bank A; and then carrying out exclusive OR operation on each obtained secret key for encryption and the byte read into the first buffer byte array buffer1 at the time to obtain encrypted bytes.
The method comprises the following specific steps:
s4.1, acquiring the current position P of the original encrypted file stream, wherein the current position P of the original encrypted file stream can be understood as follows:
if the original file is encrypted, the bytes stored in the first buffer byte array buffer1 are stored from the first character of the original file, then the original encrypted file stream at the moment has no encrypted bytes, the current position P=0, and if a part of characters in front of the original file are encrypted to form the original encrypted file stream, the byte length of the original encrypted file stream is 10 bytes, then the current position P=9 of the original encrypted file stream;
s4.2, cycling the bytes in the first buffer byte array buffer1, and dividing each byte in the first buffer byte array buffer1 by a byte maximum value Z according to (P+the position index of the byte in the first buffer byte array buffer 1) to obtain the remainder of each byte in the first buffer byte array buffer1, namely:
；
i is the i-th byte in the first buffer byte array buffer1,representing the remainder corresponding to the ith byte in the first buffer byte array buffer 1;
for example, the first byte in the buffered byte array has a position index of 1.
S4.3, respectively indexing the obtained residues to find corresponding keys for encryption in the key bank AThe number value of the remainder is the sequence number of the key,/->；
Since the random string is used to distinguish the starting point of a thread, it is possible to produce multiple starting points when similar services are concurrent, and the random string is defined to distinguish different starting points of threads, that is, the thread starting point identifier, so that when searching the corresponding secret key, multiple secret keys can be searched simultaneously.
S4.4, the obtained key for encryptionAnd performing exclusive OR operation on the byte correspondence read from the first buffer byte array buffer1 at this time in sequence to obtain an encrypted byte, namely an ith encrypted byte= (the byte in the ith first buffer byte array buffer 1) ≡j->。
S5, sequentially writing the obtained encrypted bytes from the last bit of the last byte of the original encrypted file stream according to the sequence of the encrypted bytes to form a new original encrypted file stream;
s6, judging whether bytes to be read exist in the original file, if so, jumping to S3, otherwise, jumping to S7;
s7, the new original encrypted file stream is the encrypted file corresponding to the original file, and the encryption process is finished.
According to the formula a= (a-b), wherein a-b is the encryption generated in the encryption link, so that the decryption result can be obtained by only finding the corresponding b in the encryption environment and then performing exclusive-or operation. Therefore, as shown in fig. 2, embodiment 2 further discloses a file decryption method based on the xor sum, which decrypts an encrypted file encrypted by a file encryption method based on the xor sum of embodiment 1, including:
t1, defining a second buffer byte array buffer2, wherein the byte length of the second buffer byte array buffer2 is N, and the byte length of the second buffer byte array buffer2 is determined according to external hardware configuration;
t2, clearing bytes in the second buffer byte array buffer2, reading the encrypted bytes to be read with the length of N from the encrypted file to be decrypted according to the sequence of the encrypted bytes, and changing the remaining unread encrypted bytes into the encrypted bytes to be read after the encrypted bytes in the encrypted file are read into the second buffer byte array buffer 2;
t3, taking the remainder obtained by carrying out the residual operation on each encrypted byte in the second buffer byte array buffer2 combined with the current position K of the original decrypted file stream and the maximum value Z of the byte as an index to find a corresponding key for decryption in a key bank A; then, performing exclusive OR operation on each obtained secret key for decryption and the encrypted byte read into the second buffer byte array buffer2 at this time in sequence to obtain decrypted bytes;
t4, sequentially writing the obtained decryption bytes from the last bit of the last byte of the original decryption file stream according to the order of the decryption bytes to form a new original decryption file stream;
t5, judging whether the encrypted file contains the encrypted bytes to be read, if yes, jumping to T2, otherwise jumping to T6;
and T6, the new original decrypted file stream is the original file, and the decryption process is finished.
The specific steps of T3 are as follows:
t3.1, obtaining the current position K of the original decrypted file stream;
if the decryption of the encrypted file is started, the bytes stored in the second buffer byte array buffer2 are stored from the first encrypted byte of the encrypted file, and then the original decrypted file stream has no decrypted bytes, and the current position k=0.
If a part of characters in front of an encrypted file has been decrypted to form an original decrypted file stream having a byte length of 20 bytes, then the current position k=19 of the original encrypted file stream.
T3.2, the encrypted bytes in the two-buffer byte array buffer2 are circulated, and the remainder of each encrypted byte in the two-buffer byte array buffer2 is obtained by dividing each encrypted byte in the two-buffer byte array buffer2 by the maximum value Z of the byte (K+the position index of the encrypted byte in the second buffer byte array buffer 2), namely:
；
j is the j-th encrypted byte in the second buffer byte array buffer2,representing the remainder corresponding to the j-th encrypted byte in the second buffer byte array buffer 2;
t3.3, respectively indexing the remainder of the obtained plurality of encrypted bytes to find the corresponding key for decryption in the key bank AThe numerical value of the remainder of the encrypted byte is the sequence number of the key; />
T3.4, key for decryption obtainedExclusive or operation is sequentially carried out on the byte correspondence read from the second buffer byte array buffer2 at this time to obtain decrypted bytes, namely, jth decrypted bytes= (encrypted bytes in the jth second buffer byte array buffer 2) ≡>。
In this embodiment, the keystore a used in T3 is the same keystore as the keystore a designed in the file encryption method based on the exclusive or and the remainder of embodiment 1.
Embodiment 3 also discloses an electronic device comprising at least one processor, and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method as described above.
Embodiment 4 also discloses a storage medium storing a computer program which, when executed by a processor, implements the aforementioned method.
The following are specific codes for implementing the encryption and decryption methods by the c# implementation:
using System.Text;
const string KeyString = "File encryption and decryption method based on exclusive OR operation," +
The method can be used for scenes in any field where encryption and decryption of files are required. "+
"it uses a random string of not less than 255 bytes in length as a key store" +
"can contain arbitrary characters such as numerals, letters, chinese characters, etc." +
And encrypting and decrypting the file by using the exclusive OR operation and the residual operation. ";
var keys = System.Text.Encoding.UTF8.GetBytes(KeyString);
encryption of/file
using (var orgStream=new FileStream ("original encryption File", fileMode OpenOrCreate))
{
using (var encryptStream =new FileStream ("encrypted file", filemode. OpenorCreate))
{
var buffer = new byte[10];
var count = 0;
while ((count = orgStream.Read(buffer, 0, buffer.Length))>0)
{
var p = (int)encryptStream.Position;
for (int i = 0; i<buffer.Length; i++)
{
buffer[i] ^= keys[(p + i) % 255];
}
encryptStream.Write(buffer, 0, count);
}
}
}
Decryption of/file
using (var encryptStream1 =new FileStream ("encrypted file", filemode. OpenorCreate))
{
using (var decryptStream =new FileStream ("decryption file", filemode. OpenorCreate))
{
var buffer1 = new byte[1];
var count1 = 0;
while ((count1 = encryptStream1.Read(buffer1, 0, buffer1.Length))>0)
{
var p = (int)decryptStream.Position;
for (int i = 0; i<buffer1.Length; i++)
{
buffer1[i] ^= keys[(p + i) % 255];
}
decryptStream.Write(buffer1, 0, count1);
}
}
}
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (10)
1. The file encryption method based on exclusive OR and remainder is characterized by comprising the following steps:
s1, designing a key store A by using a random character string,a is a secret key in a secret key library, and n is the number of the secret keys;
s2, defining a first buffer byte array buffer1, wherein the byte length of the first buffer byte array buffer1 is M;
s3, clearing bytes in the first buffer byte array buffer1, reading bytes to be read with the length of M from an original file to be encrypted according to the byte arrangement sequence into the first buffer byte array buffer1, and after the bytes in the original file are read into the first buffer byte array buffer1, enabling the remaining unread bytes to be the bytes to be read;
s4, taking the remainder obtained by carrying out the residual operation on each byte in the first buffer byte array buffer1 combined with the current position P of the original encrypted file stream and the maximum value Z of the byte as an index to find a corresponding key for encryption in the key bank A; then, carrying out exclusive OR operation on each obtained secret key for encryption and the byte corresponding to the byte read into the first buffer byte array buffer1 in sequence to obtain encrypted bytes;
s5, sequentially writing the obtained encrypted bytes from the last bit of the last byte of the original encrypted file stream according to the sequence of the encrypted bytes to form a new original encrypted file stream;
s6, judging whether bytes to be read exist in the original file, if so, jumping to S3, otherwise, jumping to S7;
s7, the new original encrypted file stream is the encrypted file corresponding to the original file, and the encryption process is finished.
2. The file encryption method based on exclusive or and remainder according to claim 1, wherein the specific process of S1 is:
s1.1, defining a character string library by using random character strings;
s1.2, encrypting the character string library to obtain a key library A.
3. The method of claim 2, wherein the byte length of the string library is not less than the byte maximum Z, and the characters in the string library include one or more of numbers, letters, and kanji.
4. The method for encrypting a file based on exclusive or and remainder according to claim 2, wherein in S1.2, said string library is encrypted by means of utf-8 encoding or Unicode encoding.
5. The file encryption method based on exclusive or and remainder according to claim 1, wherein the specific steps of S4 are:
s4.1, acquiring the current position P of the original encrypted file stream;
s4.2, cycling the bytes in the first buffer byte array buffer1, and dividing each byte in the first buffer byte array buffer1 by a byte maximum value Z according to the (P+ byte position index) to obtain the remainder of each byte in the first buffer byte array buffer1, namely:
；
i is the i-th byte in the first buffer byte array buffer1,representing the remainder corresponding to the ith byte in the first buffer byte array buffer 1;
s4.3, respectively indexing the obtained residues to find corresponding keys for encryption in the key bank AThe numerical value of the remainder is the sequence number of the key;
s4.4, the obtained key for encryptionAnd performing exclusive OR operation on the byte correspondence read from the first buffer byte array buffer1 at this time in sequence to obtain an encrypted byte, namely an ith encrypted byte= (the byte in the ith first buffer byte array buffer 1) ≡j->。
6. A file decrypting method based on exclusive or and remainder, for decrypting an encrypted file encrypted by the exclusive or and remainder-based file encrypting method according to any one of claims 1 to 5, comprising:
t1, defining a second buffer byte array buffer2, wherein the byte length of the second buffer byte array buffer2 is N;
t2, clearing bytes in the second buffer byte array buffer2, reading the encrypted bytes to be read with the length of N from the encrypted file to be decrypted according to the sequence of the encrypted bytes, and changing the remaining unread encrypted bytes into the encrypted bytes to be read after the encrypted bytes in the encrypted file are read into the second buffer byte array buffer 2;
t3, taking the remainder obtained by carrying out the residual operation on each encrypted byte in the second buffer byte array buffer2 combined with the current position K of the original decrypted file stream and the maximum value Z of the byte as an index to find a corresponding key for decryption in a key bank A; then, performing exclusive OR operation on each obtained secret key for decryption and the encrypted byte read into the second buffer byte array buffer2 at this time in sequence to obtain decrypted bytes;
t4, sequentially writing the obtained decryption bytes from the last bit of the last byte of the original decryption file stream according to the order of the decryption bytes to form a new original decryption file stream;
t5, judging whether the encrypted file contains the encrypted bytes to be read, if yes, jumping to T2, otherwise jumping to T6;
and T6, the new original decrypted file stream is the original file, and the decryption process is finished.
7. The method for decrypting a file based on exclusive or and remainder according to claim 6, wherein the specific step of T3 is:
t3.1, obtaining the current position K of the original decrypted file stream;
t3.2, cycling the encrypted bytes in the two-buffer byte array buffer2, and dividing each encrypted byte in the two-buffer byte array buffer2 by a byte maximum value Z according to (K+ the position index of the encrypted byte), so as to obtain the remainder of each encrypted byte in the two-buffer byte array buffer2, namely:
；
j is the j-th encrypted byte in the second buffer byte array buffer2,representing the remainder corresponding to the j-th encrypted byte in the second buffer byte array buffer 2;
t3.3, respectively indexing the remainder of the obtained plurality of encrypted bytes to find the corresponding key for decryption in the key bank AThe numerical value of the remainder of the encrypted byte is the sequence number of the key;
t3.4, key for decryption obtainedExclusive or operation is sequentially carried out on the byte correspondence read from the second buffer byte array buffer2 at this time to obtain decrypted bytes, namely, jth decrypted bytes= (encrypted bytes in the jth second buffer byte array buffer 2) ≡>。
8. The method for decrypting a file based on exclusive or and remainder according to claim 6, wherein the keystore a used in T3 is the same keystore as the keystore a designed in the method for encrypting a file based on exclusive or and remainder according to any one of claims 1 to 5.
9. An electronic device comprising at least one processor, and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 1 to 8.
10. A storage medium storing a computer program, which when executed by a processor implements the method of any one of claims 1 to 8.
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