DATA ENCRYPTION in Objective-C

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CHAPTER 16 DATA ENCRYPTION
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It just would not be possible. So, we want to encrypt the data in this table and in all indexes on this table even indexes such as function based indexes. (Don t forget that when encrypting data, you had better encrypt it in all places it might be found, including indexes!) Moving the data to an encrypted tablespace will accomplish that for us: ops$tkyte%ORA11GR2> alter table t move 2 tablespace encrypted; Table altered. ops$tkyte%ORA11GR2> alter index t_idx rebuild 2 tablespace encrypted; Index altered. ops$tkyte%ORA11GR2> alter system checkpoint; System altered. ops$tkyte%ORA11GR2> !strings /tmp/encrypted.dbf | grep -i ops.tkyte ops$tkyte%ORA11GR2> As you can see, the strings command on that datafile no longer turns up any data. In fact, if you were to dump every string from that file, you would observe something like this: ops$tkyte%ORA11GR2> !strings /tmp/encrypted.dbf | head }|{z }ORA11GR2 ENCRYPTED .vJ6 '6d' g#BA )are 7nAbf Y;Z< 1QM+G ops$tkyte%ORA11GR2> The only two recognizable strings in that output are ORA11GR2, the name of our database, and ENCRYPTED, the name of our tablespace. They come from the datafile header which is not encrypted, but everything else in the datafile (all of the database blocks) are encrypted. Our data is nowhere to be found. Rather, our data is nowhere to be found in that datafile. What about the other datafile, where the data used to be You ll probably find that it is still there ops$tkyte%ORA11GR2> !strings /tmp/clear.dbf | grep -i ops.tkyte OPS$TKYTE ops$tkyte ops$tkyte%ORA11GR2> as I did. Why Because when you move data, it is not like moving a physical object such as a desk or a chair. When you move data, you actually copy it and then stop pointing to the old copy. So both copies exist still in the files after the copy. If I were to steal your /tmp/clear.dbf file right now, I could probably recreate the entire table by dumping database blocks out of that file. The move process does not erase the data in the old location. Further, the move process definitely does not wipe the old information out
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CHAPTER 16 DATA ENCRYPTION
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of the UNDO tablespace (any undo generated for that table in the CLEAR tablespace will be around), nor will it remove it from the REDO stream, and definitely not from the archived logs you have, nor the backups. It will not even remove it from TEMP where it might be recorded due to a large sort. I bring up these facts that the move leaves behind many copies of the data from before the move because many people think that if they encrypt the data, they are done and it is secured. That is just the first step when employing encryption; you have to think about all of the legacy places this data might appear and do something to secure each of those. For example, if you move one table out of a tablespace into an encrypted tablespace in order to secure it, you may well consider moving all segments out of that tablespace into other tablespaces so you can ultimately drop that tablespace and wipe (erase) the datafiles. Then you have to think about what you want to do with the data that exists in old backups. You might have to take some action with those copies as well (or maybe not; only you can decide what level you need to go to protect your data). In a later section Implementing Tablespace Encryption, we ll look at the details of how it is implemented in the Oracle database. We ll look at what restrictions tablespace encryption might impose on your application and how it might affect performance. Do not expect any hard and fast tablespace encryption will affect your performance by X% numbers. The impact of tablespace encryption on your processing requirements will vary based on how your application uses the database. Having information about how Oracle implements tablespace encryption will allow you to judge to what degree it will impact your performance.
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