esp-idf/components/nvs_flash/Kconfig

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menu "NVS"
config NVS_ENCRYPTION
bool "Enable NVS encryption"
default n
depends on SECURE_FLASH_ENC_ENABLED
help
This option enables encryption for NVS. When enabled, AES-XTS is used to encrypt
the complete NVS data, except the page headers. It requires XTS encryption keys
to be stored in an encrypted partition. This means enabling flash encryption is
a pre-requisite for this feature.
endmenu