You can
use encrypting and decryption[
^] for securely store your information. you can use
database[
^] or
normal file[
^] to store data ones you encrypt.
check
System.Security.Cryptography[
^], it provides cryptographic services, including secure encoding and decoding of data, as well as many other operations, such as hashing, random number generation, and message authentication. For more information
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