Signatures with Hash Functions
Homomorphic Signatures from Chameleon Hash Functions
... polynomial functions over signed data [8]. In fact, if we translate these functions to the circuits, then the size of evaluated signatures can grow expo- nentially in the depth of the ...Chameleon ...
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Tightly-Secure Signatures from Chameleon Hash Functions
... standard-model signatures with a tight security ...tightly-secure signatures can be constructed from any Chameleon Hash function ...Chameleon Hash functions exist from generic ...
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Digital Signatures out of Second-Preimage Resistant Hash Functions
... resistant hash function and a se- cure one-time signature ...one-way hash functions out of universal one-way compression functions ...for hash functions with short output size, ...
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Cryptographic Hash Functions Message Authentication Digital Signatures
... • Collision-resistant hash functions can be built from collision-resistant compression functions using Merkle-Damgard. construction..[r] ...
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Programmable Hash Functions go Private:Constructions and Applications to (Homomorphic) Signatures with Shorter Public Keys
... homomorphic signatures: we recall their definition and then propose our construction and prove its security (including context ...digital signatures and an analysis of the proposed constant-size FDHI ...
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Hash function requirements for Schnorr signatures
... on hash functions for the Schnorr signature scheme to be secure, assuming compact group representations such as those which occur in elliptic curve ...Our hash function security requirements are ...
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On the Instantiability of Hash-and-Sign RSA Signatures
... constructed hash function description length, is polynomial (quadratic) in the number of signing ...of hash functions (which is needed to overcome the impossibility result of ...the hash ...
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Programmable Hash Functions and Their Applications
... Keywords: Hash functions, digital signatures, standard ...Programmable Hash Functions A group hash function is an efficiently computable function that maps binary strings into a ...
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Twin Signatures: an Alternative to the Hash-and-Sign Paradigm
... with hash functions and the random oracle model [3] is inspir- ing: researchers and practitioners are aware that proofs in the random oracle model are not proofs but a mean to spot design flaws and validate ...
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Fast Hash-Based Signatures on Constrained Devices
... Digital signatures are one of the most important applications of microprocessor smart ...tal signatures, RSA and ECDSA, depend on finite field ...digital signatures using hash functions ...
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Cube attacks on cryptographic hash functions
... for Hash Function Designs Since their creation, MD5 and SHA-1 had become incredibly widely used hash functions, arguably the most widely used within the public ...digital signatures, which in ...
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Integrated-key cryptographic hash functions
... of Hash Functions difficult and more practical ...a hash value, than finding a collision between two arbitrary ...given hash to obtain the corresponding password. Digital signatures is ...
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A Performance Boost for Hash-based Signatures
... underlying hash function is collision ...shorter signatures) we chose Winternitz OTS rather than the classic Lamport-Diffie ...pseudo-random functions or collision-resistant, undetectable one-way ...
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Hash Tables: Hash Functions
... Need a hash function de ned on names Hash arbitrary strings of characters You will learn how string hashing is implemented in Java!.. Preparation[r] ...
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Incremental hash functions
... Hash functions are mainly used for data integrity: when an authorized entity receive a data whose hash value is known by himself, if an unauthorized entity has altered the original data, then the ...
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Separable Hash Functions
... Even if two such codewords are found, our mapping ensures that the messages are sufficiently spaced apart. Constructing one-way permutations on H m : One-way permuta- tions are functions that map a set to itself ...
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Cryptographic hash functions and MACs Solved Exercises for Cryptographic Hash Functions and MACs
... The adversary may simply obtain the MAC value on message M i , and then produce a correct text-MAC pair (M j , M AC k (M j ||k)). 21. In this problem we will consider a signature scheme that once was proposed as a more ...
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Dynamic Cryptographic Hash Functions
... Dynamic second preimage resistance is required in the following scenario where digests are compared manually and assumptions are made about the se- curity parameter that is used. Assume a key server with a web interface ...
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Properties of Cryptographic Hash Functions
... Proof. All these implications above are based on the fact, that adversaries attacking in Pro sense have access to the key K chosen randomly by the environment and therefore they can simulate any other adversary attacking ...
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DESIGN AND ANALYSIS OF HASH FUNCTIONS
... MD-5 hash function ...resistant hash function using a new message preprocessing method called reverse ...of hash functions such as MD-5 and SHA-1 using a different message expansion coding, ...
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