On generalized Feistel networks
CRYPTO'10 Proceedings of the 30th annual conference on Advances in cryptology
Online ciphers from tweakable blockciphers
CT-RSA'11 Proceedings of the 11th international conference on Topics in cryptology: CT-RSA 2011
PolyE+CTR: a swiss-army-knife mode for block ciphers
ProvSec'11 Proceedings of the 5th international conference on Provable security
Encryption methods for restricted data limited in value range
ICCSA'10 Proceedings of the 2010 international conference on Computational Science and Its Applications - Volume Part IV
Efficient format-compliant encryption of regular languages: block-based cycle-walking
CMS'10 Proceedings of the 11th IFIP TC 6/TC 11 international conference on Communications and Multimedia Security
Building blockcipher from tweakable blockcipher: extending FSE 2009 proposal
IMACC'11 Proceedings of the 13th IMA international conference on Cryptography and Coding
Property preserving symmetric encryption
EUROCRYPT'12 Proceedings of the 31st Annual international conference on Theory and Applications of Cryptographic Techniques
ADS-B encryption: confidentiality in the friendly skies
Proceedings of the Eighth Annual Cyber Security and Information Intelligence Research Workshop
ProtectMyPrivacy: detecting and mitigating privacy leaks on iOS devices using crowdsourcing
Proceeding of the 11th annual international conference on Mobile systems, applications, and services
MrCrypt: static analysis for secure cloud computations
Proceedings of the 2013 ACM SIGPLAN international conference on Object oriented programming systems languages & applications
Protocol misidentification made easy with format-transforming encryption
Proceedings of the 2013 ACM SIGSAC conference on Computer & communications security
DupLESS: server-aided encryption for deduplicated storage
SEC'13 Proceedings of the 22nd USENIX conference on Security
End-to-end policy based encryption techniques for multi-party data management
Computer Standards & Interfaces
Searchable symmetric encryption: Improved definitions and efficient constructions
Journal of Computer Security
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Format-preserving encryption (FPE) encrypts a plaintext of some specified format into a ciphertext of identical format--for example, encrypting a valid credit-card number into a valid credit-card number. The problem has been known for some time, but it has lacked a fully general and rigorous treatment. We provide one, starting off by formally defining FPE and security goals for it. We investigate the natural approach for achieving FPE on complex domains, the "rank-then-encipher" approach, and explore what it can and cannot do. We describe two flavors of unbalanced Feistel networks that can be used for achieving FPE, and we prove new security results for each. We revisit the cycle-walking approach for enciphering on a non-sparse subset of an encipherable domain, showing that the timing information that may be divulged by cycle walking is not a damaging thing to leak.