Mobile phone: iPhone 13

System: iOS 13

Software: WeChat 8.0.32

Set to open the application lock, click phone settings to find security and privacy, click Open, and then click the application lock option. Authentication entrance: verify the fingerprint or password according to the mobile phone prompt, and enter the application locking interface. Lock WeChat, find WeChat, and click the button behind WeChat to display the lock.

Encryption is to change the original information data through a special algorithm, so that even if unauthorized users get encrypted information, they still can't understand the content of the information because they don't know the decryption method. In aeronautics, it refers to the operation of adding control points to the image pair or the whole aerial photograph belt by measuring and calculating the aerial photograph with a few known control points.

Historical source of encryption

Encryption is safe by no means because I don't know the encryption and decryption algorithm. However, the encryption key is absolutely hidden, and the popular RSA and AES encryption algorithms are completely open. Even if one party obtains the encrypted data, even if it knows the encryption algorithm, it can't open the encrypted information without the encryption key. Academia and industry have been discussing that a single hidden encryption algorithm is not secure enough.

The public encryption algorithm has been tested by hackers and encryptors for many years, which is much safer than the hidden encryption algorithm. In cryptography, encryption hides plaintext information, making it unreadable without special information. Although encryption has existed for centuries as a means of communication security, it is only used by organizations and individuals with particularly high security requirements.