What is dbms_crypto?

DBMS_CRYPTO contains basic cryptographic functions and procedures. To use this package correctly and securely, a general level of security expertise is assumed. The DBMS_CRYPTO package enables encryption and decryption for common Oracle datatypes, including RAW and large objects (LOBs), such as images and sound.
For More Information Please Refer:
https://docs.oracle.com/database/121/arpls/d_crypto.htm
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