AFAIK nothing on the Secret Key page actually works on the demo about as3crypto

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I just found the same. Any change to get a fix for this? The error happens in 
CBCMode.decrypt(), if that helps.

Original comment by [email protected] on 4 Aug 2009 at 9:39

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Same problem here, the exact error is:
RangeError: Error #2006: The supplied index is out of bounds.
    at flash.utils::ByteArray/writeBytes()
    at com.hurlant.crypto.symmetric::CBCMode/decrypt() 
[C:\ws\Crypto\com\hurlant\crypto\symmetric\CBCMode.as:40]
    at com.hurlant.crypto.symmetric::SimpleIVMode/decrypt() 
[C:\ws\Crypto\com\hurlant\crypto\symmetric\SimpleIVMode.as:52]

Original comment by [email protected] on 25 Sep 2009 at 4:31

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[deleted comment]

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I guess if you have "Plain Text" and "Cipher Text" both set to 'Text' then you 
get this error.  If you set "Plain Text" to 'Text' and "Cipher Text" to 
'Hex'... you don't get the error and it works like a charm.  

Original comment by [email protected] on 21 Jul 2010 at 3:25