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+ndnsec: NDN security tool
+=========================
+
+``ndnsec`` is a command-line tools to perform various NDN security management
+operation:
+
+::
+
+    $ ndnsec <command> <args>
+
+One can check the command list by
+
+::
+
+    $ ndnsec help
+
+Here is a list of commands supported so far:
+
+::
+
+    $ ndnsec help
+      help         Show all commands.
+      list         Display information in PublicInfo.
+      get-default  Get default setting info.
+      set-default  Configure default setting.
+      key-gen      Generate a Key-Signing-Key for an identity.
+      sign-req     Generate a certificate signing request.
+      cert-gen     Generate an identity certificate.
+      cert-dump    Dump a certificate from PublicInfo.
+      cert-install Install a certificate into PublicInfo.
+      delete       Delete identity/key/certificate.
+      export       Export an identity package.
+      import       Import an identity package.
+      set-acl      Configure ACL of a private key.
+      unlock-tpm   Unlock Tpm.
+      op-tool      Operator tool.
+
+Next, we will introduce these commands one-by-one:
+
+list
+----
+
+``list`` command can display the information of identities, keys, and
+certificates. By default, it only display all the identities created in
+the system. For example:
+
+::
+
+    $ ndnsec list
+    * /ndn/edu/ucla/cs/yingdi
+      /ndn/test/cathy
+      /ndn/test/bob
+      /ndn/test/alice
+
+The identity with ``*`` in front is the default identity of the system.
+
+If option ``-K`` or ``-k`` is specified, the output of the command will
+display key names for each identity. The key name with ``*`` in front is
+the key name of the corresponding identity. For example:
+
+::
+
+    $ ndnsec list -k
+    * /ndn/edu/ucla/cs/yingdi
+      +->* /ndn/edu/ucla/cs/yingdi/ksk-1393811874052
+
+      /ndn/test/cathy
+      +->* /ndn/test/cathy/ksk-1394129695418
+
+      /ndn/test/bob
+      +->* /ndn/test/bob/ksk-1394129695308
+
+      /ndn/test/alice
+      +->* /ndn/test/alice/ksk-1394129695025
+
+If option ``-C`` or ``-c`` is specified, the output of the command will
+display certificate names for each key. The certificate name with ``*``
+in front is the certificate name of the corresponding key. For example:
+
+::
+
+    $ ndnsec list -c
+    * /ndn/edu/ucla/cs/yingdi
+      +->* /ndn/edu/ucla/cs/yingdi/ksk-1393811874052
+           +->* /ndn/edu/ucla/cs/yingdi/KEY/ksk-1393811874052/ID-CERT/%FD%01D%85%A9a%DD
+
+      /ndn/test/cathy
+      +->* /ndn/test/cathy/ksk-1394129695418
+           +->* /ndn/test/KEY/cathy/ksk-1394129695418/ID-CERT/%FD%01D%98%9A%F3J
+
+      /ndn/test/bob
+      +->* /ndn/test/bob/ksk-1394129695308
+           +->* /ndn/test/KEY/bob/ksk-1394129695308/ID-CERT/%FD%01D%98%9A%F2%AE
+
+      /ndn/test/alice
+      +->* /ndn/test/alice/ksk-1394129695025
+           +->* /ndn/test/KEY/alice/ksk-1394129695025/ID-CERT/%FD%01D%98%9A%F2%3F
+
+get-default/set-default
+-----------------------
+
+If you are only curious about the default setting of a particular
+identity or key. You can use ``get-default`` command.
+
+If you want to check the default setting of a particular identity, you
+can specify the identity name with option ``-i``. For example, a
+command:
+
+::
+
+    $ ndnsec get-default -k -i /ndn/test/alice
+    /ndn/test/alice/ksk-1394129695025
+
+returns the default key name of ``/ndn/test/alice``. And a command:
+
+::
+
+    $ ndnsec get-default -c -i /ndn/test/alice
+    /ndn/test/KEY/alice/ksk-1394129695025/ID-CERT/%FD%01D%98%9A%F2%3F
+
+returns the default certificate name of ``/ndn/test/alice``. If option
+``-i`` is missing, the system default identity will be used.
+
+If you want to check default settings of a particular key, you can
+specify the key name with option ``-K``.
+
+::
+
+    $ ndnsec get-default -c -K /ndn/test/alice/ksk-1394129695025
+    /ndn/test/KEY/alice/ksk-1394129695025/ID-CERT/%FD%01D%98%9A%F2%3F
+
+In order to change the default setting, you can change it using command
+``set-default``. If you want to change the default system identity, you
+can use command:
+
+::
+
+    $ ndnsec set-default /ndn/test/alice
+
+If you want to set a key as the default key of its corresponding
+identity, you can specify the key name with option ``-k``:
+
+::
+
+    $ ndnsec set-default -k /ndn/test/alice/ksk-1394129695025
+
+If you want to set a certificate as the default certificate of its
+corresponding key, you can specify the certificate name with option
+``-c``:
+
+::
+
+    $ ndnsec set-default -c /ndn/test/KEY/alice/ksk-1394129695025/ID-CERT/%FD%01D%98%9A%F2%3F
+
+key-gen
+-------
+
+Command ``key-gen`` allows you to generate keys for a specified
+identity.
+
+::
+
+    $ ndnsec key-gen /ndn/test/david
+    Bv0DAAc9CANuZG4IBHRlc3QIBWRhdmlkCANLRVkIEWtzay0xMzk2OTEzMDU4MTk2
+    CAdJRC1DRVJUCAgAAAFFPoG0ohQDGAECFf0BeDCCAXQwIhgPMjAxNDA0MDcyMzI0
+    MThaGA8yMDM0MDQwMjIzMjQxOFowKjAoBgNVBCkTIS9uZG4vdGVzdC9kYXZpZC9r
+    c2stMTM5NjkxMzA1ODE5NjCCASAwDQYJKoZIhvcNAQEBBQADggENADCCAQgCggEB
+    ALS6udLacpydecxMRIfZeo74fxzpsITqaa/4UxD2FJ9lU4dtfiSSIOaRwAB/w0K/
+    AauQRq3Q1AiEocUsW2h8LmtcuF4Cj9TGAUD/1s3CISMwf9zwQ3ZhNIzN0IOsrpPA
+    TsHrbdwtOxrcFvXX4GnMLWgtvcSB52Cn68h/4AUiA1CG9/DOyCyA4EHiIkHBxh6B
+    TvAmw7SmNjr1ZBTYMaMAEV5/oLZCHzHRO+2fKdEttaWH3bz7iKVVS8u5ZxXcBs8g
+    ot55m7Xf6/TUk3qQXM1kM8wW04U+8n3jch1i7tD2T3c/OFKTT7AWndwcfbU99Z6C
+    FZ7fMsgRHxFNY8hCFZJvFFUCAREWOhsBARw1BzMIA25kbggEdGVzdAgFZGF2aWQI
+    A0tFWQgRa3NrLTEzOTY5MTMwNTgxOTYIB0lELUNFUlQX/QEAW2yfF8JTgu5okR+n
+    dRlXc3UR/b1REegrpQb3xVzs7fYiiHwFYzQE9RzOuGh/9GSMvQcfejsPw021tJnj
+    oxNx6spGTOK5Bc0QZGeC6YyNoVSaJr9Obc5Uh8eRqxw76r0pCUHP+l38UgUGeBg/
+    aHurtcu5zK0zFYX++SAfUGLUZlG4CqKBUNZC+6w9OGUXlcW411zMzfqQ7V9Gxg+p
+    1IMNJQ6trTFdIwT/4YWHsxR+16r2TRWCNHtJey2GEG84YoqRh8y37jnu7oPhAtTN
+    TgG9O7O39dZLiFg+UP3LpW1LY64fJXsNfZQmnZWcNo5lX6MXfeiPxWFjOQqnno82
+    1hgqgA==
+
+And the generated key will be automatically set to be the default key of
+the identity. The output of these command is a base64 encoded
+self-signed certificate of the generated key. By default, the specified
+identity will become the system default identity. If this is not your
+intention, you can specify option ``-n`` to disable that.
+
+sign-req
+--------
+
+If you want to ask somebody else to issue you a certificate, you need to
+create a signing request. Such a signing request is a self-signed
+certificate of the your default key. You can generate this request using
+command ``sign-req``, for example:
+
+::
+
+    $ ndnsec sign-req /ndn/test/david
+
+The request will be output to stdout. If you want to create a signing
+request for a particular key. You can specify the key name with option
+``-k``, for example:
+
+::
+
+    $ ndnsec sign-req -k /ndn/test/david/ksk-1396913058196
+
+cert-gen
+--------
+
+In order to issue others certificates, you can use command ``cert-gen``.
+Such a command requires a signing request (a self-signed certificate).
+
+::
+
+    $ ndnsec cert-gen sign_request.cert
+
+You can specify the starting timestamp of the certificate's validity via
+option ``-S`` and the ending timestamp of the certificate's validity via
+option ``-E``. You can specify the name of the certificate owner via
+option ``-N`` and other information about the certificate owner via
+option ``-I``. At last, you may also specify the signing identity of the
+certificate via option ``-s``, the default key and certificate of the
+signing identity will be used to generate the requested certificate. If
+``-s`` is missing, the system default identity will be used. A complete
+example of ``cert-gen`` command could be:
+
+::
+
+    $ ndnsec cert-gen -S 20140401000000 -E 20150331235959 -N "David" -I "2.5.4.10 'Some Organization'" -s /ndn/test sign_request.cert
+    Bv0C9wc9CANuZG4IBHRlc3QIA0tFWQgFZGF2aWQIEWtzay0xMzk2OTEzMDU4MTk2
+    CAdJRC1DRVJUCAgAAAFFPp2g3hQDGAECFf0BdjCCAXIwIhgPMjAxNDA0MDEwMDAw
+    MDBaGA8yMDE1MDMzMTIzNTk1OVowKDAMBgNVBCkTBURhdmlkMBgGA1UEChMRU29t
+    ZSBPcmdhbml6YXRpb24wggEgMA0GCSqGSIb3DQEBAQUAA4IBDQAwggEIAoIBAQC0
+    urnS2nKcnXnMTESH2XqO+H8c6bCE6mmv+FMQ9hSfZVOHbX4kkiDmkcAAf8NCvwGr
+    kEat0NQIhKHFLFtofC5rXLheAo/UxgFA/9bNwiEjMH/c8EN2YTSMzdCDrK6TwE7B
+    623cLTsa3Bb11+BpzC1oLb3Egedgp+vIf+AFIgNQhvfwzsgsgOBB4iJBwcYegU7w
+    JsO0pjY69WQU2DGjABFef6C2Qh8x0TvtnynRLbWlh928+4ilVUvLuWcV3AbPIKLe
+    eZu13+v01JN6kFzNZDPMFtOFPvJ943IdYu7Q9k93PzhSk0+wFp3cHH21PfWeghWe
+    3zLIER8RTWPIQhWSbxRVAgERFjMbAQEcLgcsCANuZG4IA0tFWQgEdGVzdAgRa3Nr
+    LTEzOTQxMjk2OTQ3ODgIB0lELUNFUlQX/QEABUGcl7U+F8cwMHKckerv+1H2Nvsd
+    OfeqX0+4RzWU+wRx2emMGMZZdHSx8M/i45hb0P5hbNEF99L35/SrSTSzhTZdOriD
+    t/LQOcKBoNXY+iw3EUFM0gvRGU0kaEVBKAHtbYhtoHc48QLEyrsVaMqmrjCmpeF/
+    JOcClhzJfFW3cZ/SlhcTEayF0ntogYLR2cMzIwQhhSj5L/Kl7I7uxNxZhK1DS98n
+    q8oGAxHufEAluPrRpDQfI+jeQ4h/YYKcXPW3Vn7VQAGOqIi6gTlUxrmEbyCDF70E
+    xj5t3wfSUmDa1N+hLRMdEAI+IjRRHDSx2Lhj/QcoPIZPWwKjBz9CBL92og==
+
+The output of ``cert-gen`` is the generated certificate with base64
+encoding.
+
+cert-install
+------------
+
+On receiving the requested certificate, you can install the certificate
+in your system via command ``cert-install``.
+
+::
+
+    $ ndnsec cert-install cert_file.cert
+
+By default, the installed certificate will be set to be the default
+certificate of its corresponding identity. And this identity will become
+the system default identity. If this is not your intention, you can
+specify option ``-N`` to install the certificate without changing any
+default setting; or you can specify option ``-K`` to set the installed
+certificate to be the default certificate of its corresponding key; or
+option ``-I`` to set the installed certificate to be the default
+certificate of its corresponding identity.
+
+cert-dump
+---------
+
+If you want to display a certificate in stdout, you can use command
+``cert-dump``.
+
+::
+
+    $ ndnsec cert-dump /ndn/test/KEY/david/ksk-1396913058196/ID-CERT/%00%00%01E%3E%9D%A0%DE
+
+By default, a base64 encoded certificate is displayed. You can specify
+option ``-p`` to display a decoded certificate:
+
+::
+
+    $ ndnsec cert-dump -p /ndn/test/KEY/david/ksk-1396913058196/ID-CERT/%00%00%01E%3E%9D%A0%DE
+    Certificate name:
+      /ndn/test/KEY/david/ksk-1396913058196/ID-CERT/%00%00%01E%3E%9D%A0%DE
+    Validity:
+      NotBefore: 20140401T000000
+      NotAfter: 20150331T235959
+    Subject Description:
+      2.5.4.41: David
+      2.5.4.10: Some Organization
+    Public key bits:
+    MIIBIDANBgkqhkiG9w0BAQEFAAOCAQ0AMIIBCAKCAQEAtLq50tpynJ15zExEh9l6
+    jvh/HOmwhOppr/hTEPYUn2VTh21+JJIg5pHAAH/DQr8Bq5BGrdDUCIShxSxbaHwu
+    a1y4XgKP1MYBQP/WzcIhIzB/3PBDdmE0jM3Qg6yuk8BOwett3C07GtwW9dfgacwt
+    aC29xIHnYKfryH/gBSIDUIb38M7ILIDgQeIiQcHGHoFO8CbDtKY2OvVkFNgxowAR
+    Xn+gtkIfMdE77Z8p0S21pYfdvPuIpVVLy7lnFdwGzyCi3nmbtd/r9NSTepBczWQz
+    zBbThT7yfeNyHWLu0PZPdz84UpNPsBad3Bx9tT31noIVnt8yyBEfEU1jyEIVkm8U
+    VQIB
+
+delete
+------
+
+If you want to delete identities, keys, or certificates, you can use
+command ``delete``. You need to supply a name to this command. By
+default the name should be the identity to delete. For example:
+
+::
+
+    $ ndnsec delete /ndn/test/david
+
+If option ``-K`` or ``-k`` is specified, the name should be the name of
+the key to delete. If option ``-C`` or ``-c`` is specified, the name
+should be the name of the certificate to delete.
+
+export/import
+-------------
+
+You can export or import security data of a specified identity. The
+security data may even include private key (which is protected by
+encryption).
+
+In order to export security data of an identity, you can use command:
+
+::
+
+    $ ndnsec export /ndn/test/alice
+
+This will output all the public security data of the specified identity
+to ``stdout``. If you want to export private keys, you need to specify
+option ``-p``. If you want to export security data into a file, you can
+specify the file name with option ``-o``.
+
+If you can also import security data of a particular identity from a
+file, you can use command:
+
+::
+
+    $ ndnsec import input_file
+
+If input\_file is ``-``, the command will import security data from
+``stdin``. If the security to import contains private key, you need to
+specify option ``-p``.
+
+unlock-tpm
+----------
+
+Depending on the internal implementation, the Trusted Platform Module
+(TPM) which manages private keys may be locked. If you want to
+explicitly unlock the TPM, you can use ``unlock-tpm`` command.