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| -rw-r--r-- | Documentation/security/keys/ecryptfs.rst | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/Documentation/security/keys/ecryptfs.rst b/Documentation/security/keys/ecryptfs.rst index 4920f3a8ea75..0e2be0a6bb6a 100644 --- a/Documentation/security/keys/ecryptfs.rst +++ b/Documentation/security/keys/ecryptfs.rst @@ -5,10 +5,10 @@ Encrypted keys for the eCryptfs filesystem ECryptfs is a stacked filesystem which transparently encrypts and decrypts each file using a randomly generated File Encryption Key (FEK). -Each FEK is in turn encrypted with a File Encryption Key Encryption Key (FEFEK) +Each FEK is in turn encrypted with a File Encryption Key Encryption Key (FEKEK) either in kernel space or in user space with a daemon called 'ecryptfsd'. In the former case the operation is performed directly by the kernel CryptoAPI -using a key, the FEFEK, derived from a user prompted passphrase; in the latter +using a key, the FEKEK, derived from a user prompted passphrase; in the latter the FEK is encrypted by 'ecryptfsd' with the help of external libraries in order to support other mechanisms like public key cryptography, PKCS#11 and TPM based operations. @@ -22,12 +22,12 @@ by the userspace utility 'mount.ecryptfs' shipped with the package The 'encrypted' key type has been extended with the introduction of the new format 'ecryptfs' in order to be used in conjunction with the eCryptfs filesystem. Encrypted keys of the newly introduced format store an -authentication token in its payload with a FEFEK randomly generated by the +authentication token in its payload with a FEKEK randomly generated by the kernel and protected by the parent master key. In order to avoid known-plaintext attacks, the datablob obtained through commands 'keyctl print' or 'keyctl pipe' does not contain the overall -authentication token, which content is well known, but only the FEFEK in +authentication token, which content is well known, but only the FEKEK in encrypted form. The eCryptfs filesystem may really benefit from using encrypted keys in that the |