REOP(1)

NAME
reop - reasonable expectation of privacy

SYNOPSIS
reop -D -x encfile
reop -E [-1b] [-i ident] -m message -p pubkey -s seckey
reop -S [-e] [-x sigfile] -s seckey -m message
reop -V [-eq] [-x sigfile] -p pubkey -m message

DESCRIPTION
The reop utility creates and verifies cryptographic signatures and encrypts and decrypts files. The mode of operation is selected with the following options:

-D  Decryption, both public key and symmetric.

-E  Encryption, both public key and symmetric. When run without a public key, will ask for a password and perform symmetric encryption.

    When run with a public key, will encrypt the message so that it can be decrypted by the matching secret key. Public key encryption also uses encryptor's secret key to authenticate the message. Once encrypted, the message can only be decrypted by recipient's secret key. Although authenticated, messages are deniable (forgeable by recipient).

-G  Generate a new key pair.

-S  Sign the specified message file and create a signature.

-V  Verify the message and signature match.

The other options are as follows:

-1  Encrypt messages using older v1 format.

-b  Use a binary format for encrypted files. This can result in a considerable space savings over the default base64 encoded format. Decryption automatically detects the correct format.

-e  When signing, create a signed message instead of just a signature.

-i ident
    Specify the ident to be created during key generation or looked up when using public cryptography.

-m message
    When signing, the file containing the message to sign. When verifying, the file containing the message to verify. When encrypting or decrypting, the plaintext.

-n  Do not ask for a passphrase during key generation. Otherwise, reop will prompt the user for a passphrase to protect the secret key.

-p pubkey
    Public key produced by -G, and used by other commands.

-q  Quiet mode. Suppress informational output.

-s seckey
    Secret (private) key produced by -G, and used by other commands.

-x xfile
    The signature file to create or verify. The default is message.sig. When encrypting, the encrypted file. The default is message.enc.

The key and data files created by reop have similar format. A plain text line of the form ident: is used to match key pairs. Most of the actual key data follows and is base64 encoded.

The ~/.reop directory is searched for default keys named:
seckey
    User's secret key
pubkey
    User's public key
pubkeyring
    User's set trusted of trusted third party keys, searched by ident.

EXIT STATUS
It may fail because of one of the following reasons:

•   Some necessary files do not exist.
•   Entered passphrase is incorrect.
•   The message file was corrupted and its signature does not match.
•   The message file is too large.

EXAMPLES
Create a new key pair.
    $ reop -G -p newkey.pub -s newkey.sec

Create a new key pair, assuming the ~/.reop directory exists:
    $ reop -G

Sign a file, specifying a signature name:
    $ reop -S -s key.sec -m message.txt -x msg.sig

Verify a signed message, using the default identity:
    $ reop -V -x generalsorders.sig