Repairing security status
Although the majority of security status losses occur due to hostile acts, such as piracy or griefing, you can sometimes lose a few points from accidental activities. Repairing this security status loss can be a tedious process but with a few alterations to your method the time taken can be shortened.
Security status gains are achieved by killing NPC’s from the various pirate corporations (Guristas, Sanshas, Serpentis, Angel Cartel, etc). Note that Faction rats such as Amarr or Gallente will only give faction standing changes, not security status.
Security gain mechanics
A security status gain occurs for the HIGHEST value outlaw NPC you kill within a 15 minute time period PER SYSTEM.
Each rat is worth a certain security percentage. There doesn’t seem to be any hard data as to what each rat is worth, but the harder the rat is to kill, the higher it is.
To find out the actual security gain for each rat, times the difference between your security status and 10.0 by the security percentage of the rat.
So, for example, if your security status was -0.5 and the security percentage value of the rat you killed was 0.2%, then the calculation would be:
Security gain = 10.5 x (0.2/100) = 0.021
The quick method
While all NPC rats from missions, deadspace complexes and belts will give you a security status gain, to gain security status quickly we take advantage of the gain timer being system based. Find yourself a nice chain of systems to rat in – 10 systems long should be enough. Find a rat in the first system and kill it. Jump to the next system. Find a rat in the new system. Kill the rat and jump to the next system. Keep doing this until you are back in your original system. If you time it right, you should only get back to this system after the original 15 minute timer is up. Keep it up until you get the security status gain you want or you get bored and go do other things.
Which systems should I do it in?
As stated above, the harder the rats are to kill, the more security status gain they are worth. Systems that have a lower security rating have harder to kill rats and thus are worth more personal security status gain. The most common guidelines suggest killing BS rats in 0.0 space, but obviously you should take all normal precautions for travelling in lowsec or nullsec space. Killing ratting ships is a speciality of many lowsec PC pirate corporations, so beware. For small security status repairs low end highsec such as 0.5 systems yield valuable enough rats over time.