i'm not sure what you are after here, might need a little clarification.
Are you talking about Data Masking like this article?
Where you obfuscate/replace sensitive data on a copy of the data?
what does this mean, specifically?
we do not want any users accessing SQL server to read the data using the query analyser
does that mean simply take away permissions on the table for the users, or does that mean they can access the data using an application, but if they reuse their credentials in SSMS/Query Analyzer, you want to block them?
some ideas i wonder about:
can you replace the table with a view?
can you take away permissions?
is everyone a sysamdin?
--help us help you! If you post a question, make sure you include a CREATE TABLE... statement and INSERT INTO... statement into that table to give the volunteers here representative data. with your description of the problem, we can provide a tested, verifiable solution to your question! asking the question the right way gets you a tested answer the fastest way possible!