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What does data encryption storage include?
Encrypted data storage is an important measure to protect sensitive information. By using technologies and methods such as symmetric encryption, asymmetric encryption, hash functions, data encryption algorithms, key management, multi-factor authentication and secure storage devices, the confidentiality, integrity and availability of data can be ensured and the security of data can be improved. . In today's digital era, data encryption storage has become an important means to protect personal privacy and business secrets.
What does data encryption storage include?Data encryption storage includes technologies and methods such as symmetric encryption, asymmetric encryption, hash functions, data encryption algorithms, key management, multi-factor authentication and secure storage devices. Detailed introduction: 1. Symmetric encryption, fast and simple encryption and decryption process; 2. Asymmetric encryption, providing higher security; 3. Hash function, which is irreversible, that is, the original data cannot be restored from the hash value. ; 4. Data encryption algorithm, which performs complex mathematical operations on data so that unauthorized users cannot decrypt the data; 5. Key management, etc.
What is the most representative of symmetric encryption algorithms?The most representative of the symmetric encryption algorithms is: DES encryption algorithm; DES encryption uses a block encryption method, using a 56-bit key to encrypt 64-bit plaintext, and finally generates a 64-bit ciphertext; algorithm features: relatively short blocks, key If it is too short, the password life cycle will be short and the operation speed will be slow.
What is the difference between symmetric encryption and asymmetric encryptionDifferences: 1. In symmetric encryption, the same secret key is used for encryption and decryption; in asymmetric encryption, two keys are used. Generally, the public key is used for encryption and the private key is used for decryption. 2. Symmetric encryption and decryption are relatively fast, while asymmetric encryption and decryption take a long time and are relatively slow. 3. Symmetric encryption has relatively low security, while asymmetric encryption has high security.
In PHP, what does hash function mean?A hash function is any function that can be used to map data of any size to data of a fixed size. The value returned by a hash function is called a hash value, hash code, digest, or simply hash. Syntax stringhash(string$algo,string$data[,bool$raw_output=FALSE]) Parameter algo The name of the selected hash algorithm (such as "md5", "sha256", "haval160,4", etc.) data to be hashed information. When raw_output is set to TRUE, raw binary data is output. FALSE outputs lowercase hexadecimal. Example
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