known plain-text attacks

[Atom 'Smasher']

if two or more recipients are specified in an encrypted message, they all
share a single symmetric session-key, which is asymmetrically encrypted
using each of their public keys.... (as i understand it)

if one of those recipients wanted to crack the private key of one of the
other recipients, would it be helpful that the session-key is known? does
that facilitate a known plain-text attack? does it matter which asymmetric
encryption algorithm is used?

are the algorithms vulnerable to this? does the implementation makes this
attack unlikely?


	...atom

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