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Issue No. 04 - July/August (2010 vol. 8)
ISSN: 1540-7993
pp: 66-69
Christian Cachin , IBM Research
Jan Camenisch , IBM Research
Encryption keys are sometimes encrypted themselves; doing that properly requires special care. Although it might look like an oversight at first, the broadly accepted formal security definitions for cryptosystems don't allow encryption of key-dependent messages. Furthermore, key-management systems frequently use key encryption or wrapping, which might create dependencies among keys that lead to problems with simple access-control checks. Security professionals should be aware of this risk and take appropriate measures. Novel cryptosystems offer protection for key-dependent messages and should be considered for practical use. Through enhanced access control in key-management systems, you can prevent security-interface attacks.
key encryption, cryptography, security and privacy, semantic security, CCA2 security, key management, access control

J. Camenisch and C. Cachin, "Encrypting Keys Securely," in IEEE Security & Privacy, vol. 8, no. , pp. 66-69, 2010.
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