The 1 and DES algorithms have three entry parameters: Key, Data and Mode. Where Key is 7 bytes ***56 bits, which is the working key of DES algorithm; The data is 8 bytes and 64 bits, which is the data to be encrypted or decrypted; Mode is the working mode of DES, and there are two ways: encryption or decryption.
2.DES is a mode of DES encryption algorithm, which uses three 64-bit keys to encrypt data three times. It is a transitional encryption algorithm from DES to AES and a safer variant of DES. It uses DES as the basic module, and designs a block encryption algorithm by combining the block method. Asymmetric encryption is also called public key encryption.
3.DES encryption algorithm is a block cipher, which encrypts data in groups of 64 bits. Its key length is 56 bits, and the encryption and decryption use the same algorithm. DES encryption algorithm keeps the key secret, while public algorithms include encryption and decryption algorithms.
4. triple data encryption gorithm (English: Triple Data Encryption Gorithm, abbreviated as TDEA, TripleDEA) or Triple 3DES(TripleDES) is a symmetric key encryption block cipher, which is equivalent to applying DES algorithm three times to each data block.
Asymmetric encryption and symmetric encryption
1. symmetric encryption: If you use symmetric encryption to transmit encrypted files through the network, you may be eavesdropped no matter how you tell the other party the key.
2. Asymmetric encryption has two keys, namely PublicKey and PrivateKey. Different keys are used to encrypt and decrypt data. Encrypt with public key and decrypt with private key.
3. The concept of symmetric encryption: encryption and decryption use the same pair of keys, which is called symmetric encryption. Encryption methods: DES, 3DES, AES, security from low to high.
What are the symmetric encryption algorithms?
There are mainly DES algorithm, 3DES algorithm, TDEA algorithm, Blowfish algorithm, RC5 algorithm and IDEA algorithm. Symmetric encryption algorithm is characterized by open algorithm, small amount of calculation, high encryption speed and high encryption efficiency.
Symmetric encryption algorithm is used to encrypt sensitive data and other information. Commonly used algorithms are: DES algorithm: data encryption standard, which is fast and suitable for encrypting a large amount of data. 3DES algorithm: Based on DES, a piece of data is encrypted three times with three different keys, and the strength is higher.
Common symmetric encryption algorithms are: DES- key is short, it takes a long time to use, and hardware calculation is faster than software. Idea- Personal use is not restricted by patents and can resist differential cryptanalysis, based on three groups. AES- variable key length and variable packet length. The above three types belong to grouping type, and plaintext grouping encryption.
Is des a symmetric encryption algorithm or an asymmetric encryption algorithm? How many bits is the encryption key?
1 instead of asymmetric encryption, the encryption and decryption keys are different. Their algorithms are also different. L symmetric encryption algorithm symmetric encryption algorithm is an early encryption algorithm with mature technology.
2.des is always a symmetric encryption algorithm, that is, the encryption key and decryption key are the same. DES uses a 56-bit key and an additional 8-bit parity bit to generate packets with a maximum of 64 bits.
3, symmetric encryption! DES algorithm is a symmetric cryptosystem among cryptosystems, and it has also become the data encryption standard in the United States. It is an encryption algorithm of symmetric cryptosystem developed by IBM in the United States in 1972.
4.DES is called DataEncryptionStandard, which is a grouping algorithm using key encryption. 1977 was determined as the federal data processing standard (FIPS) by the National Bureau of Standards of the US federal government, and was authorized to be used in non-confidential government communications, and then the algorithm was widely spread internationally.