Hot answers tagged xml-encryption
10
After reading the paper How to Break XML Encryption (thanks to Krzysztof for the link), here are my two cents.
This attack relies on the fact that a CBC-ciphertext C = (IV, C1, ... Cd) can be decomposed into pairs of (IV, C1), (C1, C2), (C2, C3), ... (C(d-1), Cd), each of which is also a valid CBC ciphertext for the same key, relating to the corresponding ...
9
Neither. It means that an attacker can decrypt all messages that have been encrypted using this standard.
The attack is a padding oracle attack. That means that, if the attacker has a ciphertext they want to decrypt, they can send several variations of the ciphertext to the server. By analyzing the server's responses (e.g., error messages returned), it ...
3
Your third question asked how this attack relates to pre-existing applications of CBC. Before being used to break XML encryption, it was used on certain protocols run over TLS/SSL. See my answer here. For other protocols like IPSEC, WTLS, and SSH, the original paper proposing the attack has a good discussion of its applicability (in Section 5).
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