This script is using random numbers from dice, hashed random strings and computer generated random numbers. All random numbers are mixed using bitwise XOR.

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Here is "Diceware" for Electrum 1.x. The disadvantage is you should "throw away" most of the random numbers (because there are 1625 words but all possible random numbers made with 5 dice rolls are 7776).

If you have 5 dice, you should roll them about 5 times for every random word you need (you roll them until you get valid senary number - the probability of getting the valid senary number is 20%). This is the price you pay for not using computer.

This works only with Electrum 1.x because 2.x is using checksums.