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Encrypt BFILE column Tips

Oracle Database Tips by Donald BurlesonNovember 26, 2015

Question:  I have a table column that is a BFILE BLOB column and I want to encrypt it.  I have noted in the documentation that you cannot use standard encryption for a BFILE column.  How do I encrypt a BFILE column that contains a LOB?

Answer: Yes, you are correct that standard encryption cannot be used on BFILE (externally ) stored columns.  Instead you need to use the dbms_crypto procedure to store a BFILE.  There only 3 data types supported by dbms_crypto, and they are RAW, BLOB and CLOB, any of which can be a BFILE storage on a standard OS flat file.

A BLOB can be either stored internally as a column, or stored in an external file (BFILE).

For an example of using DBMS_CRYPTO on BLOB data, see "Example of Encryption and Decryption Procedures for BLOB Data".

 
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