Hash cryptography is based on algorithm called SHA(Secure Hash Algorithm) which can be SHA-3,SHA-1,SHA-256 and many more. Here I am briefing SHA-256 where the data is represented in hexadecimal form which is 64 characters long made up of numbers (0 to 9) and and alphabets (a to f) each 4 bits long. Basically hash is like a fingerprint means unique. For example:- a document with hash 📄--> 0023a76bef63c568 67dc128a3fe60a7e d47b95a532b60a74 a62e73f026d957a3 Some properties of hash are- 1- Avalanche effect:- the hash will change with even a single change in document. 2- Deterministic:- the document will always give the same hash. 3:- One way:- one can calculate hash of a document but document ...