The CIA Lockpicking Manual, Central Intelligence Agency
Central Intelligence Agency

The CIA Lockpicking Manual

68 printed pages
Did you ever lose your keys? Lock picking is the skill of unlocking a lock by analyzing and manipulating the components of the lock device, without the original key. Although lock picking can be associated with criminal intent, it is an essential skill for a locksmith. Lock picking is the ideal way of opening a lock without the correct key, while not damaging the lock, allowing it to be rekeyed for later use, which is especially important with antique locks that would be impossible to replace if destructive entry methods were used.
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Have you ever thought, "Just what is it that actually allows us to pick a lock?" It is the inability of the manufacturer of any product to machine parts to an almost flawless level of tolerance. Even if they could reasonably approach their goals, the expense alone would be astronomicaL
Therefore, we, as locksmiths, are able to pick a lock, so to speak, due to the reality of this situation. To see specifically what is involved, we must look at a typical cylinder.

The tolerance inadequacies to which I refer can be categorized for easy reference. The first is the difference between the plug and the shell. An acceptable amount of
difference is approximately .005 or about .0025 all around the plug (see Figure 1).
The process by which the keyway is "cut" into the plug is called broaching. This process is easily observed when

a blank or cut key is inserted in the keyway and "play" is felt due to a significant tolerance differential.
Probably the most significant problem of this sort is the


Apakah anda pernah berpikir, "Hanya apa yang benar-benar memungkinkan kita untuk mengambil kunci?" Ini adalah ketidakmampuan produsen produk apapun untuk bagian-bagian mesin yang hampir sempurna tingkat toleransi. Bahkan jika mereka bisa cukup mendekati tujuan mereka, mengorbankan saja akan astronomi
Oleh karena itu, kita, sebagai ringtone, mampu mengambil kunci, sehingga untuk berbicara, karena kenyataan dari situasi ini. Untuk melihat secara khusus apa yang terlibat, kita harus melihat yang khas silinder.

Toleransi kekurangan yang saya lihat dapat dikategorikan untuk kemudahan referensi. Yang pertama adalah perbedaan antara plug dan shell. Jumlah yang diterima
perbedaan adalah sekitar .005 atau sekitar .0025 seluruh plug (lihat Gambar 1).
Proses di mana alur pasak adalah "memotong" ke plug disebut menggerek. Proses ini lebih mudah diamati ketika

kosong atau memotong kunci dimasukkan ke dalam alur pasak dan "bermain" dirasakan karena adanya toleransi diferensial.
Mungkin yang paling signifikan masalah semacam ini adalah

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