Using as an example the AdventureWorks2014 database, the first script describes the process of encrypting the “CardNumber” column from the Sales.CreditCard table while keeping the data decryptable.
Our pre-requisite is the creation of a Master Key, a Certificate and a Symmetric Key.
Once having those created, we may proceed to the addition of a new column called “CardNumberEnc” (where the suffix “Enc” stands for “Encrypted”). This column has a VARBINARY(250) Data Type and is nullable.
Read on for an example of using column-level encryption, followed by how you’d decrypt the data. Then, Eric discusses hashing, though I disagree with the nomenclature of “encryption and make the data non-decryptable.” The reason is that encryption is, by its nature, a two-way process and necessarily requires the ability to decrypt. Hashing, meanwhile, is a one-way process without a direct means of reversal. Nomenclature aside, the examples are good and I appreciate Eric using one of the larger SHA2 hashing algorithms rather than MD5.