In this paper, we answer this problem affirmatively by presenting efficient constructions of the chameleon hash function satisfying the enhanced collision resistance. The contributions of this work are twofold. First, we show the weakness of previous work. Then, we proceed with proposing new schemes ...
A new hash function based on a coupled chaotic map lattice is proposed. By combining floating-point chaotic computations with algebraic operations as well as local and global couplings, the system reaches high bit confusion and diffusion rates and thus desirable collision resistance with even one-ite...
Theory Collision resistance is related tosecond preimage resistance, which is also known as weak collision resistance. A minimal requirement for a hash function to be collision resistant is that the length of its result should be 192 bits (in 2011). Collision resistance is the defining property o...
6 we discuss what problems may be caused by different notions of collision-resistance within recent applications to redactable blockchains [5, 26]. Here, either the hash function to chain blocks in a blockchain or the hash functions to aggregate transactions within single blocks (usually by ...
但是实际上根据CRHF定义，如果一个函数是抗碰撞的，指的是任何多项式时间敌手，不能在多项式时间内，以不可忽略概率找到x1≠x2，且h(x1)=h(x2)，这样即为collision resistant。这代表可能存在不同输入但是对应相同输出，只要无法在多项式时间内以不可忽略概率找到即可满足条件。对于h'(x)，如果仅仅存在一组碰撞值...
In Cuid2, we use a tiny, fast, security-audited, NIST-standardized hash function and we seed it with random entropy, so on production environments where the globals are all identical, we lose the unique fingerprint, but still get random entropy to replace it, strengthening collision resistance...
large number of output bits can be controlled without knowledge of the key (which at this time not feasible even for measly HMAC-MD5, and also not for HMAC-SHA1, despite SHA1'ttered; that's because HMAC doesn't rely on preimage resistance or collision resistance to uphold its security)....
aIn general, a so-called hash value is calculated using a hash function from the document to be signed, which is characterized in that it represents a kind of digital fingerprint of the document, where the function has a single property, and collision resistance. This means that from an ...
generated from an electronic file, message or block of data is called a message digest or hash value. A key property of a securecryptographic hash functionis strong collision resistance -- that is, it should be computationally infeasible to find two different inputs that create the sa...
hash functions that provide what you determine to be an acceptable trade-off between speed and collision resistance. This seed approach has been considered by several software projects, including Lua (http://thread.gmane.org/gmane.comp.lang.lua.general/87491) and libxml2 (http://git.gnome....