Three Prime Numbers: 2, 3 and 5. I will call them A, B and C so A=2, B=3 and C=5 Working through x as the current position, and i being the unencrypted password and j being the encrypted as an array, so i[x] is the 'current' position we get: j[x] = ((j[x-1] + i[x] + A) * B ) MOD C The password example I give is: Encrypting 123 1 (unencrypted password) + 2 (Prime A) = 3 3 * 3 (Prime B) = 9 9 MOD 5 (Prime C) = 4 4 (previous encrypted) + 2 (current unencrypted) + 2 (Prime A) = 8 8 * 3 (Prime B) = 24 24 MOD 5 (Prime C) = 4 4 (previous encrypted) + 3 (current unencrypted) + 2 (Prime A) = 9 9 * 3 (Prime C) = 27 27 MOD 5 (Prime C) = 2 So the encrypted password is 442
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