Difference between revisions of "Cryptography"

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= Description =
Cryptography is an area of computing focused on encrypting data in order to prevent it from being readable by another (potentially malicious) user. Cryptography has applications all over SL where any form of data-security is required, be it an item vendor, or a game, or a device that processes personal details.


Unfortunately in LSL there are few good methods provided for security, beyond the ability to communicate with off-site services using HTTPS. For this reason there have been several efforts to implement encryption/decryption standards in [[LSL]], and more recently take advantage of [[Mono]] for greater encryption.
= Cryptography Libraries =
== Test Vectors ==
For all security libraries reviewed a common set of test-vectors (message and key(s)) should be used. These are the following recommended ones:
=== Base64 Message (1536-bit) ===
Remove new-lines
<pre>
VAgWWFUfAJvIxSwoSUGCCR/QnQvXif9oswq1JaICbrohjfOTiINmRVQkr1q+awPXd2nGncz8Pelb/
2vdx2vhh8UJiF6jBChzNGqr01l7ssgrIKGuXxKHw2JF8bByz7mREbmvxrndkM288HuwJYw0LlnaM1
3h8lzSBrQnLzr/Xwb6l3MfU867b/WtcuwpyXci9KKKYczywNs9Ay8N80xrwaA5sqWYysLrQD43U+l
w9wPpbzf8/kJfwxZL4WL6nfxi=
</pre>
=== Hexadecimal Key ===
<pre>42DBE20995628324EB343C6CF9D3C5F4</pre>
=== Base64 Key ===
Identical to the above hex-key but in Base64
<pre>QtviCZVigyTrNDxs+dPF9A==</pre>
== Symmetric Key ==
''Times below are given as a time to encrypt and decrypt the above test-message using the above test-key''
{|{{Prettytable}}
|-{{Hl2}}
!Library
!Security
!Encrypt/Decrypt Time
!Summary
|-
|[[AES Strong Encryption|AES]]
|Very strong
|0.891489
|Relatively slow compared to other symmetric ciphers, but affords industry-standard security with no known weaknesses. Can encrypt a 2.3kb message with guaranteed 256-bits of security in around 5-10 seconds.
|-
|[[llXorBase64StringsCorrect|Base64 XOR]]
|Very weak
|0.006923
|Very strong when used as a [http://en.wikipedia.org/wiki/One_Time_Pad one-time-pad], but if used with the same key more than once becomes extremely vulnerable to attack. Use where speed is the highest priority, and where a message (if cracked) is useless after a very short time.
|-
|[[Vignére Weak Encryption|Vignére Cipher]]
|Weak
|0.097980
|Stronger than a regular base64 XOR, and can sustain repeated use of the same key for short periods of time. Use only for messages that become useless after a short period of time.
|}
== Asymmetric Key ==
No useful asymmetric key cryptography libraries are yet available due to the high computing cost of such algorithms.
<div id="box">
== See Also ==
<div style="padding: 0.5em">
'''Articles'''
*[[:Category:LSL Examples| Examples]]
</div></div>

Revision as of 16:03, 2 September 2008

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