Found 3 Articles for Hashing

Hash Indexes In DBMS, it is possible to create access structures that function similar to indexes by using hashing. This secondary structure is known as a hash index and is used to access the file based on a search key that is different from the one used for the primary data file organization. Index entries in a hash index are of the form or , where K is the search key, Pr is a pointer to the record containing the key, or P is a pointer to the block containing the record for that key. The hash index file ... Read More

We know that bitcoins enter into the digital market only through mining. It is a cryptocurrency created as a peer-to-peer currency which can be traded without using any Bank or Payment gateway. When these transactions are made, they are accounted for using a publicly distributed ledger which keeps a record of all the transactions made to every Bitcoin.Every time a transaction is made, a new block is created. Every new block will be verified and added into the block chain by the miners. Here comes the purpose of hash functions to make the block chain secure.What is a Hash?Hash is ... Read More

The 51% attack refers to an attack on the block chain network, deceiving the miners with a duplicate block chain which has more than 50% acceptance and spending the same bitcoins again.To put it in simple words, a single miner or a pool of miners controlling more than 50 (say 51%) of the cryptocurrency network’s mining hash power, can attack the block chain network and reverse the transactions. Once they have more than 50% of hashing power they can take control of the cryptocurrency network and they could double spend the coins.However, by controlling the majority of computing power on ... Read More