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A block cipher is an encryption algorithm which encrypts fixed-size blocks of plaintext to same-sized blocks of ciphertext. For good ciphers every bit of the ciphertext block depends on every bit of the plaintext block and every bit of the key.
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Why mining bitcoins is difficult?
There are 4294967296 nonces, because it is 32-bit.
Most of the time, none of the nonces will produce a "Golden Block".
If none of the nonces work, the miner must make a new block (with a different M …