Mastering Monero: The future of private transactions by SerHack

Author:SerHack
Language: eng
Format: mobi, epub
Publisher: Lernobook LLC
Published: 2019-04-17T05:00:00+00:00

Please send 50 EUR to Jen.

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True message

Please send 500 EUR to Jen.

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Added an extra ‘0’ to amount

Please send 60 EUR to Jen.

f5087a90b63b1777

Changed ‘5’ to ‘6’

Please send 50 EUR to Jon.

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Changed recipient to ‘Jon’

Please send 50 EUR to Jen.

a2d2a9059ed8d323

Same input = same output!

the example output here is the first 16 characters of each input’s SHA-256 hash

$ echo {input} | sha256sum | cut -c1-16

Hash functions are heavily utilized in many cryptocurrency security features. Cryptographic hash functions are engineered to be collision-resistant, which means that it is hard to find two input messages that collide to produce the same output digest. This is central to the immutability (tamperproof nature) of the blockchain, since any attempts to change data in a past block will result in an entirely different hash output for that and all subsequent blocks.

This notion of an expanding append-only database with each group of entries cryptographically secured by hashes to the previous block is a key concept behind the blockchain revolution.

4.5.2 Nonces (general concept)

The term nonce refers to a puzzle that is not inherently physically/mathematically meaningful. For example, consider the following “fill-in-the-blank” questions that a teacher might give their students:

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