The cryptographic algorithms of modern cryptography are generally divided into two categories: symmetric cryptographic algorithms and asymmetric cryptographic algorithms.

A symmetric cryptographic algorithm refers to an algorithm that uses the same key for encryption and decryption. The main feature of symmetric encryption algorithm is fast encryption speed and suitable for encrypting big data. Common symmetric encryption algorithms include DES, 3DES, AES, etc.

Asymmetric cryptographic algorithms refer to algorithms that use different keys for encryption and decryption. The main features of asymmetric encryption algorithms are high encryption strength and good security. Common asymmetric encryption algorithms include RSA, ECC, etc.

In addition to symmetric cryptography and asymmetric cryptography algorithms, there are also some other cryptographic algorithms, such as hash functions, digital signatures, etc. The function of the hash function is to compress a message of any length into a fixed-length hash value to ensure the integrity of the message. Digital signature uses an asymmetric encryption algorithm to sign the digest of the message to ensure the authentication and integrity of the message.

In cryptography, the security of cryptographic algorithms is an important issue. The security of a cryptographic algorithm means that an attacker cannot crack the ciphertext within a reasonable time and obtain the original information. For the security of cryptographic algorithms, factors such as key length, algorithm complexity, and cryptographic security often need to be considered.

In short, modern cryptographic cryptographic algorithms are mainly divided into two categories: symmetric cryptographic algorithms and asymmetric cryptographic algorithms, and also include other cryptographic algorithms such as hash functions and digital signatures. The security of cryptographic algorithms is an issue that needs attention in cryptography. Factors such as key length, algorithm complexity, cryptographic security, etc. need to be comprehensively considered to ensure the security of the algorithm.