[smb at cs.columbia.edu: Skype security evaluation]

[Morlock Elloi]

What is the threat model? Even ROT-13 would thwart casual listening on or data
harvesting. If you to be secure then you use voice over IPSec, PGPhone or any
of dozens of other solutions.

The idea that a commercial carrier can or should provide NSA-proof security
boggles the mind. Nice masturbatory material though.




> The paper above shows an easy birthday attack on such encryptions.
> Approximately 18% of 128 bit numbers can be expressed as a product of
> two 64-bit numbers. For such keys, if the ciphertext is C, consider
> all 2^64 values m1 and m2, and compare m1^e with C/m2^e. This can be
> done in about 2^64 time and memory, and if the plaintext is in that
> 18%, it will be found as m1*m2.



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