| -v | Display the version number and compile-time options, then exit. |
| -h | Display a brief help message and exit. |
| -4, -5 | Selects MD4 or MD5, respectively, as the response generation algorithm. The default for otp-md4 is MD4 and the default for opie-md5 is MD5. The default for opiekey depends on compile-time configuration, but should be MD5. MD4 is compatible with the Bellcore S/Key Version 1 distribution. |
| -f | Force opiekey to continue, even where it normally shouldn’t. This is currently used to force opiekey to operate in even from terminals it believes to be insecure. It can also allow users to disclose their secret pass phrases to attackers. Use of the -f flag may be disabled by compile-time option in your particular build of OPIE. |
| -a | Allows you to input an arbitrary secret pass phrase, instead of running checks against it. Arbitrary currently does not include ’\0’ or ’\n’ characters. This can be used for backwards compatibility with key generators that do not check passwords. |
| -n <count> |
| | the number of one time access passwords to print. The default is one. |
| -x | Output the OTPs as hexadecimal numbers instead of six words. |
| -t <type> |
| | Generate an extended response of the specified type. Supported types are: wordsix-word hex hexadecimal inithexadecimal re-initialization init-wordsix-word re-initialization The re-initialization responses always generate the simple active attack protection. |
| |
|
