Bitcoin uses SHA - 256, which is a set of cryptographic hash functions designed by the U.S National Security Agency. (thecryptocurrencynews.org)
It uses Blockchain features like a transaction ledger, public / private key encryption, and cryptographic hash functions for security so that users don't have to assume the risk of censorship or hacking as with data centers. (the-blockchain.com)
«So long as the chains can support the same cryptographic hash function, it is possible to make transactions across blockchains without trust in 3rd party custodians.» (captainaltcoin.com)