View source for EVVA 3KS

= EVVA 3KS =

{{Lock model
| name           = EVVA 3KS
| Img            = File:EVVA_3KS.jpg
| years_produced = 1993-Present
| lock_type      = Varied
| lock_design    = [[Sidebar]], [[Slider]]
| maker          = [[EVVA]]
}}

The '''3KS''' ('''3 Curven System''') ('''3 Curve System''') is a high security [[sidebar]]-based lock made by [[EVVA]]. The 3KS is resistant to most [[Locks#Compromise_of_locks|methods of entry]], and is immune to [[Bumping|key bumping]] attacks. It uses two sidebars that interface with six sliders each, as well as a passive key profiling mechanism.

__TOC__

== Principles of Operation ==

The 3KS uses a total of twelve free-floating sliders, two [[sidebar]]s, and a passive profile bar. Sliders are divided into two groups of six, each located on one side of the keyway. Each set of sliders has its own sidebar. The key uses two sets of laser tracks to manipulate single and double pin sliders. The top and bottom of the blade have cuts corresponding the passive key profile bar used in the lock.                                                                                                                 

When the key is inserted the sliders are guided by the laser tracks of the key. Once fully inserted the profile bar falls onto the top of the key. If the profile and slider cuts are correct the plug can rotate. When the plug is rotated the sidebars are pushed into the key to hold it in place.

<div align="center"><gallery>
File:Lw_3ks_key.jpg|The 3KS key.
File:EVVA_3KS_sliders.jpg|3KS single and double pin sliders.
File:EVVA 3KS plug sidebar aligned.jpg|The 3KS with one set of sliders properly aligned (sidebar removed).
</gallery></div>

Notes:
* There are 9<sup>6</sup>&times;7<sup>6</sup> total [[differs]].<ref>[http://toool.nl/images/f/f9/Cutaway1.pdf Han Fey (TOOOL NL). May 2005. ''Cutaway Locks'']</ref>
* Double pin sliders have 7 positions, and single pin sliders have 9 positions.
* Key blanks come with the double pin laser track pre-cut; locksmiths only need to add the single pin cut.
* Sliders and sidebars are made of hardened steel and are teflon coated for additional longevity.

== Key Control ==

3KS [[key]]s are patent protected and duplication is restricted. 3KSPlus keys are patent protected until 2025. The laser tracks and other key features make manual duplication difficult. A key [[security card]] is required in order to obtain duplicate 3KS keys.<ref>[http://www.evva.at/products/mechanical-locking-systems/schliesssystem-3ks-3ksplus/technology/en/ Keys: EVVA (3KS, 3KSPlus)]</ref>

== Disassembly instructions ==
The 3KS requires the key be ''removed'' from the cylinder for the plug to be withdrawn. Sliders must me properly centered or they will block removal of the plug, similar to how they block removal of the plug when a key is inserted.

It is much easier to disassemble the 3KS if the cylinder can be removed from its mounting and held so that the keyway is parallel to the ground. This is because sliders need to be positioned in the center of the plug, but also because it prevents the sliders from falling out when the plug is withdrawn.

# Remove the [[cam]] and C clip.
# Hold the cylinder so that the keyway and sliders are parallel to the ground.
# Insert and remove a key. (This centers all sliders)
# Lightly push the back of the plug. If all sliders are centered it should easily withdraw from the cylinder.

== Vulnerabilities ==
The 3KS may be vulnerable to one or more of the following:

* [[Lockpicking]]
* [[Decoding]]
* [[Destructive Entry]]

Notes:
* Immune to [[Bumping|key bumping]] attacks. Bumping causes damage to both the key and sliders.
* The top or bottom of a key may be filed off to defeat the key profiling mechanism.

== Gallery ==

<div align="center"><gallery>
File:EVVA 3KS cylinder.jpg|3KS cylinder and key
File:EVVA_3KS_profiles.jpg|Different 3KS key profiles.
File:EVVA_3KS_lasertracks.jpg|3KS keys with the same double-pin track, different single-pin tracks.
File:EVVA_3KS_sidebars.jpg|Both 3KS sidebars. Note the notches the sliders fall into.
File:EVVA 3KS plug with sidebar.jpg
File:EVVA 3KS plug.jpg|The 3KS [[plug]] with all components removed.
File:EVVA 3KS keycard.jpg|3KS key [[security card]].
File:EVVA 3KS cylinder inside.jpg|Inner view of the [[cylinder]].
</gallery></div>

== References ==
<references />

== See also ==
* [[EVVA]]
* [[Slider]]

[[Category:Locks]]
[[Category:EVVA|3]]
[[Category:Slider locks]]
[[Category:Sidebar locks]]