Encryption/Decryption Question

Hi gang:

Okay, a question to the Encryption/Decryption gurus out there.

If you were given:

1. This encrypted string:

p3IVhDBT26i+p4vd7J4fAw==

2. Were told it was a social security number (i.e., in the form of 
123-45-6789).

3. And it had been generated from this code:

$cipher = mcrypt_module_open(MCRYPT_TRIPLEDES,'','cbc','');
mcrypt_generic_init($cipher, $key1, $key2);
$encrypted = mcrypt_generic($cipher,$social_security_number);

4. Where $key1 and $key2 are md5() values calculated from two 
different security phrases.

5. Where each security phrase contains multiple non-English words.

What would it take for you to break the encrypted string and decipher 
the social security number? Can it be done? If so, how long?

And lastly, where would the "best" place to store these security 
phrases? (Note: I didn't ask where would be the best place for me to 
put them.)  :-)

Cheers,

tedd

PS: No, the SS number in question is not 123-45-6789. :-)

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