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In cryptography and computer science, a hash tree or Merkle tree is a tree in which every "leaf" node is labelled with the cryptographic hash of a data block, and every node that is not a leaf (called a branch, inner node, or inode) is labelled with the cryptographic hash of the labels of its child nodes.
In hash-based cryptography, the Merkle signature scheme is a digital signature scheme based on Merkle trees (also called hash trees) and one-time signatures such as the Lamport signature scheme. It was developed by Ralph Merkle in the late 1970s [ 1 ] and is an alternative to traditional digital signatures such as the Digital Signature ...
Hash-based signature schemes use one-time signature schemes as their building block. A given one-time signing key can only be used to sign a single message securely. Indeed, signatures reveal part of the signing key. The security of (hash-based) one-time signature schemes relies exclusively on the security of an underlying hash function.
In cryptography, the Merkle–Damgård construction or Merkle–Damgård hash function is a method of building collision-resistant cryptographic hash functions from collision-resistant one-way compression functions. [1]: 145 This construction was used in the design of many popular hash algorithms such as MD5, SHA-1, and SHA-2.
He co-invented the Merkle–Hellman knapsack cryptosystem, invented cryptographic hashing (now called the Merkle–Damgård construction based on a pair of articles published 10 years later that established the security of the scheme), and invented Merkle trees. The Merkle–Damgård construction is at the heart of many hashing algorithms. [4 ...
Living in a neighborhood with a high concentration of trees could significantly lower levels of inflammation and, importantly, decrease the risk of heart disease, new research from Green Heart ...
Merkle tree; See also. Hash trie This page was last edited on 29 April 2017, at 13:36 (UTC). Text is available under the Creative Commons ...
Merkle-Damgård hash construction that is used inside almost all modern cryptographic hash functions. Illustration by David Göthberg, Sweden. Released by David as public domain. Remake and extension of Merkle-damgard.png made by Matt Crypto. Also added ideas from Merkle-Damgard.png by Mangojuice. Date: 8 April 2007: Source: Own work: Author ...