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Keywords: cipher block chaining, adaptive chosen plaintext attack, input-output masked cbc.
| Content Provider | CiteSeerX |
|---|---|
| Author | Loe, Chuan-Wen Khoo, Khoongming |
| Abstract | Abstract: In the literature, several encryption modes of operation based on cipher block chaining (CBC) has been proven to be secure under non-adaptive chosen plaintext attack (CPA-1) in the left-or-right (LOR) or find-then-guess (FTG) security models. However, it was shown by Joux et. al. at Crypto 2002 that if we allow the adversary to perform an adaptive chosen plaintext attack (CPA-2), then CBC, ABC and GEM are susceptible to FTG attacks. In this paper, we propose a new CBC-type encryption called input-output masked CBC (IO-CBC) which can protect against FTG and LOR attacks based on forcing an input collision, protects against Joux’s FTG attack under proper implementation, and increases the difficulty of linear and differential cryptanalysis. The efficiency of IO-CBC is comparable to CBC because it does only one additonal encryption when compared with CBC. We also reasoned that the security proof of an IO-CBC variant follows from that of OCB. 1 Insecurity of CBC-type Modes under CPA-2 Attack The CBC mode is one of the most commonly used encryption mode in practice. Let Ek(·) denote a secure block encryption function with secret key k. CBC can be described as: |
| File Format | |
| Access Restriction | Open |
| Subject Keyword | New Cbc-type Encryption Cipher Block Chaining Security Proof Input-output Masked Cbc Ftg Attack Proper Implementation Joux Ftg Attack Secret Key Non-adaptive Chosen Plaintext Attack Several Encryption Mode Additonal Encryption Cpa-2 Attack Differential Cryptanalysis Io-cbc Variant Secure Block Encryption Function Cbc-type Mode Lor Attack Used Encryption Mode Security Model Cbc Mode Input Collision Adaptive Chosen Plaintext Attack |
| Content Type | Text |
| Resource Type | Article |
