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Is there a way, besides writing in ios and android, to securely store data in the common without external libraries? A friend of mine said something about storing in secrets but when googling it I didn’t found anything

Don't know specifically without external libraries. <https://github.com/touchlab-lab/KaMPKitSQLCipher|This> might be of some help though and more specifically the platform specific counterparts for the drivers are:
• <https://github.com/touchlab-lab/KaMPKitSQLCipher/blob/da1f4e347254b9c3f083725af13cd7f0b62397ef/shared/src/androidMain/kotlin/co/touchlab/kampkit/KoinAndroid.kt#L16|Android>
• <https://github.com/touchlab-lab/KaMPKitSQLCipher/blob/da1f4e347254b9c3f083725af13cd7f0b62397ef/shared/src/iosMain/kotlin/co/touchlab/kampkit/KoinIOS.kt#L34|iOS>
However this is using external libraries (SQLDelight, SQLCipher for android). iOS supports sqlite encryption extensions as seen at <https://dev.to/samhill303/multiplatform-encryption-with-sqldelight-and-sqlcipher-5do4|this post>.