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Old July 16th, 2009, 06:26 PM
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Default How to hash 2 columns of SQL table

Dear experts,

I have a MS SQL table, let's called it "year_end", there is a column with sensitive data called "customer ID", I would like to hash the "customer ID" column by the identity column and then load it into a new table row by row with the hash result. Example:

The "year_end" table:

name varchar(30)
address varchar(30)
customer_ID char(9)

The new "year_end" table:

name varchar(30)
address varchar(30)
customer_ID ???? (hash value)

I need the codes in C# to do this. Do I use Console application to do this or ASP.NET? I am new to C#.

Thanks in advance.
Old July 17th, 2009, 02:55 AM
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Well I can see now reason to do it as a ASP.Net web application, unless you have a need for a cross browser interface to this 'functionality'. Either way the code will be the same.

I'd recommend a MD5 hash of the column. A simple search for "MD5 C#" should provide you with the samples you need.
/- Sam Judson : Wrox Technical Editor -/

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Old July 17th, 2009, 03:08 AM
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As an alternative I'd take a look at SQL Server's built-in encryption features.

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