esp-idf/examples/security/flash_encryption/partitions_example.csv

# Name,   Type, SubType, Offset,  Size, Flags
nvs,        data, nvs,      ,  0x6000,
# Extra partition to demonstrate reading/writing of encrypted flash
storage,    data, 0xff,     ,  0x1000, encrypted
factory,    app,  factory,  , 1M,
# nvs_key partition contains the key that encrypts the NVS partition named nvs. The nvs_key partition needs to be encrypted.
nvs_key,    data, nvs_keys, , 0x1000, encrypted,
# Custom NVS data partition
custom_nvs, data, nvs,      ,  0x6000,