Tweakable block ciphers secure beyond the birthday bound in the ideal cipher model = 이상 암호 모델에서 생일 상한을 넘는 안전성을 가지는 트윅 블록 암호

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We propose a new construction of tweakable block ciphers from standard block ciphers. Our construction, dubbed XHX2, is the cascade of two independent XHX block ciphers, so it makes two calls to the underlying block cipher using tweak-dependent keys. We prove the security of XHX2 up to min($2^{2(n+m)/3},2^{n+m/2}$) queries (ignoring logarithmic factors) in the ideal cipher model, when the block cipher operates on n-bit blocks using m-bit keys. The XHX2 tweakable block cipher is the first construction that achieves beyond-birthday-bound security with respect to the input size of the underlying block cipher in the ideal cipher model.
Advisors
Lee, Jooyoungresearcher이주영researcher
Description
한국과학기술원 :정보보호대학원,
Publisher
한국과학기술원
Issue Date
2019
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 정보보호대학원, 2019.2,[iii, 34 p. :]

Keywords

tweakable block cipher▼abeyond-birthday-bound security▼aideal cipher model▼aH-coefficient technique; 트윅 블록 암호▼a생일 상한 초과 안전성▼a이상 암호 모델▼aH-coefficient 기법

URI
http://hdl.handle.net/10203/267178
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=843587&flag=dissertation
Appears in Collection
IS-Theses_Master(석사논문)
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