As per the Crypto Class documentation in the Apex Developer’s Guide, the Apex Crypto class provides a number of cryptographic functions for creating digests, message authentication codes, and signatures, as well as functions for encrypting and decrypting information. These functions allow you to protect the confidentiality of data as well as allow external systems to verify the integrity of messages and authenticity of the sender.

Check the below link for more information

https://developer.salesforce.com/page/Apex_Crypto_Class

Cheers!!!