International Association for Cryptologic Research

International Association
for Cryptologic Research

CryptoDB

Chanathip Namprempre

Publications

Year
Venue
Title
2014
EUROCRYPT
2012
JOFC
On-line Ciphers and the Hash-CBC Constructions
We initiate a study of on-line ciphers. These are ciphers that can take input plaintexts of large and varying lengths and will output the i th block of the ciphertext after having processed only the first i blocks of the plaintext. Such ciphers permit length-preserving encryption of a data stream with only a single pass through the data. We provide security definitions for this primitive and study its basic properties. We then provide attacks on some possible candidates, including CBC with fixed IV. We then provide two constructions, HCBC1 and HCBC2, based on a given block cipher E and a family of computationally AXU functions. HCBC1 is proven secure against chosen-plaintext attacks assuming that E is a PRP secure against chosen-plaintext attacks, while HCBC2 is proven secure against chosen-ciphertext attacks assuming that E is a PRP secure against chosen-ciphertext attacks.
2009
JOFC
2008
JOFC
2004
EUROCRYPT
2003
JOFC
2002
ASIACRYPT
2002
EUROCRYPT
2001
CRYPTO
2000
ASIACRYPT

Program Committees

Crypto 2011
TCC 2006