encrypted QR code and key size

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So we're doing a project about an attendance system ,the idea that we have an encrypted data in a qrcode that will be sent to a server to be extracted and then decrypted using a key stored in a database on the server.what would be the best encryption technique while maintaining a reasonable key size in the DB keeping in mind that our data will only consist of 8 characters

asked 19 secs ago

Mahmoud Ibra

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encrypted QR code and key size