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Generate 300 million 13-digit pure digital redemption codes

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Release： 2016-09-22 08:56:47
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I want to verify the redemption code through encryption and decryption instead of putting 300 million redemption codes in the database to reduce the pressure on the database.
Do you have any good encryption and decryption methods?

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I want to verify the redemption code through encryption and decryption instead of putting 300 million redemption codes in the database to reduce the pressure on the database.
Do you have any good encryption and decryption methods?

I wonder if there is a prize for 300 million? It seems that there is no need to store if there is no prize

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