SHA-256 is the recommended stronger alternative to SHA-1. See FIPS PUB 180-4 for implementation details.

Either by using a dedicated library or implementing the algorithm in your language, show that the SHA-256 digest of the string "Rosetta code" is: 764faf5c61ac315f1497f9dfa542713965b785e5cc2f707d6468d7d1124cdfcf

#!/usr/bin/perl 
use strict ;
use warnings ;
use Digest::SHA qw( sha256_hex ) ;
 
my $digest = sha256_hex my $phrase = "Rosetta code" ;
print "SHA-256('$phrase'): $digest\n" ;
 