Xor Encrypt Decrypt Php how to#
Xor Encrypt Decrypt Php code#
Xor Encrypt Decrypt Php password#

The previous part introduced how to use the XOR encryption algorithm to encrypt user information.

Xor Encrypt Decrypt Php password#

In addition, for old users, obtain the user name and encrypted password information in the database in line 24, and use these two values to decrypt in line 25, and then compare the decrypted value with the user name information submitted by the user in line 28 to check the legitimacy of the user. On line 19, the encrypted password value is obtained using the username and password submitted by the user, and for new users, this encrypted value is stored in the database on line 44. Line 7 introduces the encryption function file encrypy_xor.php, including the two functions introduced in the previous section. The implementation of 'Check User' is as follows. The 'User Login' page does not need to be changed.

Xor Encrypt Decrypt Php code#

The implementation code of this example can be implemented based on the implementation of Section 18.4.1 'User Login' and Section 18.4.2 'Check User'. (2) Decrypt according to the password information (plaintext) stored in the database and the password (key) information input by the user, and compare the encrypted information with the user name submitted by the user, if they are equal, the user is legal, otherwise, for illegal users.īoth methods can achieve the third purpose, in this example, the second method will be used. If they are equal, the user is legal, otherwise, it is an illegal user. (1) Re-encrypt according to the submitted user name (plaintext) and password (key) information, and use the encrypted information to compare with the password information stored in the database. In addition, when the user logs in, there are the following two ways to verify the legitimate user. In order to achieve the above purpose, when using the XOR algorithm, the user name can be selected as the plaintext, and the key is the user-defined password, and then the encrypted user name is stored in the database. The system can verify the legitimacy of the user according to the password entered by the user.In addition to the user himself, no one else can obtain their password information, including system designers and database administrators.When the user is registered, the user needs to add the user password form.In this example, in order to protect the user's password, the system wants to achieve the following purposes.

Next, this method will be used to encrypt the user's login password. The previous two parts introduced the principle and implementation of information encryption/decryption using XOR operation.

Using XOR algorithm to implement authentication The result of running the above example is as follows. Lines 5 and 6 respectively call the encryption function to generate and output the ciphertext in turn, the ciphertext is decrypted in lines 7 and 8. Line 3 first defines a plaintext $my_password, then line 4 defines the key $my_key. $my_password_de=myDecrypt( $my_password_en,$my_key) $my_password_en=myEncrypt($my_password,$my_key) According to the principle of the XOR encryption algorithm introduced in the previous section, it is not difficult to write the following encryption and decryption functions. The previous part introduced the principle of how to use the XOR operation for encryption/decryption, and this section will use it to encrypt the user's login information. After encrypting Chinese characters, it cannot be restored to the original characters after decryption. Unlike some simple encryption algorithms, it is only valid for Western characters.

(2) It is fast and can be used at any time and anywhere. (1) The algorithm is simple and can be easily implemented for high-level languages. If If C and B are XORed again, C will be restored to A.Ĭompared with other simple encryption algorithms, the advantages of the XOR algorithm are as follows. The principle of this method is: when a number A and another number B are XORed, another number C will be generated. From the perspective of the main encryption methods, the transposition method is too simple, especially in the case of a small amount of data, it is easy to guess the plaintext from the ciphertext, and the substitution method is an effective simple algorithm.įrom the characteristics of various substitution methods, the XOR operation is most suitable for simple encryption and decryption operations.