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What is sha224 encryption?

The five algorithms of the SHA family, SHA-1, SHA-224, SHA-256, SHA-384, and SHA-512, were designed by the National Security Agency (NSA) and published by the National Institute of Standards and Technology (NIST); they are U.S. government standards. The last four are sometimes referred to as SHA-2. SHA-1 is widely used in many security protocols, including TLS and SSL, PGP, SSH, S/MIME, and IPsec, and was once considered a successor to MD5, an earlier widely used hash function. But SHA-1's security is now seriously questioned by cryptographers; although there has been no effective attack on SHA-2, its algorithm is still basically similar to SHA-1; so some people are beginning to develop alternative hashing algorithms.

What is the difference between sha1, sha256, sha384, and sha512?

The differences between sha1, sha256, sha384, and sha512 lie in the encryption algorithm, the length of the encrypted ciphertext and the difficulty of cracking. Relatively speaking, the encryption security of sha256 is already quite high.