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Paper 2015/813

Revisiting Turning Online Cipher Off

Ritam Bhaumik and Mridul Nandi

Abstract

In 'Turning Online Ciphers Off', a class of constructions was defined based on layers of secure online ciphers interleaved with simple mixing layers (like reversing and block-shifting). Here we show that an SPRP construction proposed in the work cited is insecure. Howevewr, the same construction is secure under the assumption that the underlying construction is online-but-last ciphers. We include a simpler proof for beyond-birthday security of other constructions proposed in the same work.

Metadata
Available format(s)
PDF
Category
Secret-key cryptography
Publication info
Preprint. MINOR revision.
Keywords
symmetric-key cryptographycryptanalysisSPRP securityprovable securityonlineonline ciphers
Contact author(s)
bhaumik ritam @ gmail com
History
2015-08-17: received
Short URL
https://ia.cr/2015/813
License
Creative Commons Attribution
CC BY
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