database - SQLite3: Delete record without overwriting it with nullbytes -

-

according explanation[1] how possible recover deleted records sqlite-database, 2 things happen when delete record: area containing deleted record added free list (as free block) , "header" in content area overwritten.

the content not (or few bytes) overwritten, e.g. opening database file hex editor can still see parts of deleted record.

so check whether true or not, here’s minimal example:

sqlite3 example.db  sqlite> create table 'test'(acolumn varchar(25)); sqlite> insert test values('aaaaaaaaaa'); sqlite> insert test values('bbbbbbbbbb'); sqlite> insert test values('cccccccccc'); sqlite> delete test acolumn = 'bbbbbbbbbb';

what i’m expecting – opening file hex editor – between cccc… , aaaa… there still bs (but bytes before bs or first few bs should have been overwritten). happens whole area bs has been overwritten nullbytes.

this happens larger databases, too. content area cleaned nullbytes , because of impossible recover anything.

is there option or flag have use results shown in blogpost?

i need create sqlite-databases in way, able recover deleted records (or parts of them) forensic tools.

[1]http://sandersonforensics.com/forum/content.php?222-recovering-deleted-records-from-an-sqlite-database

your version of sqlite happens compiled sqlite_secure_delete enabled.


Comments

Post a Comment

Popular posts from this blog

magento2 - Magento 2 admin grid add filter to collection -

-
i created grid in admin xml ui components. need filter collection via url parameter , dont know how achieve that. tried inject requestinterface collection, filter didnt work. di.xml <virtualtype name="slidelistingdataprovider" type="magento\framework\view\element\uicomponent\dataprovider\dataprovider"> <arguments> <argument name="collection" xsi:type="object" shared="false">xxx\xxx\model\resourcemodel\grid\slide\collection</argument> <argument name="filterpool" xsi:type="object" shared="false">slidelistingfilterpool</argument> <!-- define new object filters --> </arguments> </virtualtype> <virtualtype name="slidelistingfilterpool" type="magento\framework\view\element\uicomponent\dataprovider\filterpool"> <arguments> <argument name="applier...
Read more

Android volley - avoid multiple requests of the same kind to the server? -

-
i using volley upload list of images server. happens within service. once image uploaded remove list. problem arises when internet connection breaks. when internet connection breaks , comes again thinking of adding images yet uploaded request queue. this can result in more 1 copy of same image saved on server request same image might have gone through before getting rseponse. how can address scenario? i'm not quite sure why you're using service schedule requests volley automatically runs it's request in seperate thread. nevertheless can listen both request results, successful , unsuccessful adding listeners. you can remove image list schedule request using volley. if succeeds can carry on desired, if fails can add again list. public static request getimageuploadrequest(final string image) { response.listener<t> responselistener = new response.listener<t>() { @override public void onresponse(t response...
Read more

Combining PHP Registration and Login into one class with multiple functions in one PHP file -

-
i'm trying combine registration, activation , login scripts php website backend script front end developer can pass variables different forms to. my question whether appropriate approach this. don't want have lot of php files different pieces of application developing. far have written following 2 functions login, register , activate user front end developer can call: <?php /** * created phpstorm. * user: karl * date: 26/07/2016 * time: 02:25 */ class users { function register_user($email, $password, $user_name) { $server_name = "localhost"; $u_name = "root"; $db_password = "root"; $db_name = "betamath_graspe"; //email notification variable $from_address="info@slack.com"; //registration form $msg_reg_user='username taken. please choose different username'; $msg_reg_email='email registered'; $msg_reg_active=...
Read more