Oracle encrypted password sniffed through a network

["hassan hani" <amni___ () hotmail com>]

we are deploying a security plan for our database oracle server.

Any oracle client like SQLPLUS ou Developper2000 send login in cleat text 
via network and the password is encrypted .

i want to know if  it is easy to decrypt the encrypted password send through 
network , and sniffed by attacker.

please help

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