# Security flaws in SealedObjects

Ilan Zohar (ilanz@leland.Stanford.EDU)
Mon, 08 Mar 1999 18:07:38 -0800

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    Date: Mon, 08 Mar 1999 18:07:38 -0800

    From: Ilan Zohar <ilanz@leland.Stanford.EDU>

    To: java-security@java.sun.com

    Subject: Security flaws in SealedObjects

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Hi,
I am a graduate student in Stanford University.
I've been using JCE 1.2 and I really enjoy it. I found out that the most
convenient way to use encryption/decryption is to use the Sealed Object
class.
However,.. since java safety design made led the JCE designer to insert
the object's full desciption in the SealedObject objects , decreasing
the entropy of the ciphertext and hence the security of its use.
moreover since Java throws an exception whenever the decryption fails,
the java run time system can be used as an Oracle to leak information
about the cipher text, which clearly against the intent of the
encryption users.

Thanks,

Ilan Zohar
ilanz@leland.stanford.edu
Computer Systems Laboratory
Stanford University

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