Isn't encryption on the device the best bet for a safe cloud?
encryption on the device the best bet for a safe cloud?
„cloud computing“ encompasses two aspects:
- Data storage in a cloud for
one’s self, excluding multiple or third-party access.
- Data processing or storage of
information in a cloud, intended for multiple or third-party access.
In the first
case, encrypting data on a device and then transferring it in encrypted form to
the cloud is sufficient. However, should information be shared with third
parties, as in the second case, the secret key would have to be distributed
through some safe channels or by centralized key administration. Transferring
the key through unsafe channels (e.g., a password by e-mail), can lead to
undesired eavesdropping through robots and third parties. However, should the
data not only be stored but also processed in the cloud, data encryption is
necessary once it has been transferred to the cloud. This is because data
processing requires, with the exception of so-called homomorphic encryption, that
the data is available in plain text. Usually at this point, the administrators
of the cloud, as well as the cloud application, have direct access to the
confidential data. Consequently, that kind of data processing requires
trustworthy providers and administrators. The special feature of the sealed
cloud is that it logically, electronically and mechanically prevents the
operators or administrators from accessing the data during processing. Thus,
the sealed cloud creates the possibility to process confidential data in the
cloud. idgard® applies this new basic technology to enable secure communication
via sealed privacy boxes without complicated key management.
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