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Two New Efficient CCA-Secure Online Ciphers: MHCBC and MCBC

机译:两种新型的高效CCA安全在线密码:MHCBC和MCBC

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Online ciphers are those ciphers whose ciphertexts can be computed in real time by using a length-preserving encryption algorithm. HCBC1 and HCBC2 are two known examples of Hash Cipher Block Chaining online ciphers. The first construction is secure against chosen plaintext adversary (or called CPA-secure) whereas the latter is secure against chosen ciphertext adversary (or called CCA-secure). In this paper, we have provided simple security analysis of these online ciphers. We have also proposed two new more efficient chosen ciphertext secure online ciphers modified-HCBC (MHCBC) and modified-CBC (MCBC). If one uses a finite field multiplication based universal hash function, the former needs one less key and one less field multiplication compared to HCBC2. The MCBC does not need any universal hash function and it needs only one blockcipher key unlike the other three online ciphers where two independent keys (hash function and blockcipher) are required.
机译:在线密码是指可以通过使用保留长度的加密算法实时计算其密文的密码。 HCBC1和HCBC2是哈希密码块链接在线密码的两个已知示例。第一种结构对选定的明文对手(或称为CPA安全)是安全的,而后者对选定的密文对手(或称为CCA安全)是安全的。在本文中,我们提供了对这些在线密码的简单安全性分析。我们还提出了两种新的,效率更高的密文安全在线密文:修改后的HCBC(MHCBC)和修改后的CBC(MCBC)。如果使用基于有限域乘法的通用哈希函数,则与HCBC2相比,前者需要少一个密钥,也需要少一个域乘法。 MCBC不需要任何通用哈希函数,并且只需要一个分组密码密钥,就不像其他三个需要两个独立密钥(哈希功能和分组密码)的在线密码。

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