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security bug fixes

Signed-off-by: Smita Kumari <kumarismita62@gmail.com>

Fix coding style

Signed-off-by: Smita Kumari <kumarismita62@gmail.com>

use existing escapeHtml function

Signed-off-by: Smita Kumari <kumarismita62@gmail.com>
Merge pull request #1220 from smita786/gsoc_central_columns_list

security bug fixes
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Merge remote-tracking branch 'origin/master'
Since PHP 5.3.0, it's not longer required to call srand() before
mcrypt_create_iv().

Signed-off-by: Marc Delisle <marc@infomarc.info>
Use better source of entropy for mcrypt IV

Signed-off-by: Michal Čihař <michal@cihar.com>
Regenerate cookie encryption IV for every session

The IV for cookie encryption was generated just once for every browser
and kept in a cookie. Generating it for every session is much better to
avoid information leaks (eg. that same user has logged in).

Signed-off-by: Michal Čihař <michal@cihar.com>
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Merge remote-tracking branch 'origin/QA_4_2' into QA_4_2
Merge commit '59bb241cf13fd9a02626eb73daf5a5ca8476b29e'