Paper 2012/449

Long Term Confidentiality: a Survey

Johannes Braun, Johannes Buchmann, Ciaran Mullan, and Alex Wiesmaier


Sensitive electronic data may be required to remain confidential for long periods of time. Yet encryption under a computationally secure cryptosystem cannot provide a guarantee of long term confidentiality, due to potential advances in computing power or cryptanalysis. Long term confidentiality is ensured by information theoretically secure ciphers, but at the expense of impractical key agreement and key management. We overview known methods to alleviate these problems, whilst retaining some form of information theoretic security relevant for long term confidentiality.

Note: Update to final version.

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Publication info
Published elsewhere. The nal publication is available at (DOI : 10.1007/s10623-012-9747-6)
long term confidentialityinformation theoretic securityperfect secrecyeverlasting security
Contact author(s)
jbraun @ cdc informatik tu-darmstadt de
2012-09-13: revised
2012-08-07: received
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      author = {Johannes Braun and Johannes Buchmann and Ciaran Mullan and Alex Wiesmaier},
      title = {Long Term Confidentiality: a Survey},
      howpublished = {Cryptology ePrint Archive, Paper 2012/449},
      year = {2012},
      note = {\url{}},
      url = {}
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