---
name: "rotp"
section: "1"
platform: "linux"
package: "ruby-rotp"
version: "6.2.0-2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/rotp"
---

# rotp(1)

Ruby library for generating and verifying one time passwords

## NAME

rotp - Ruby library for generating and verifying one time passwords

## SYNOPSIS

**rotp** \[options\]

## DESCRIPTION

A Ruby library for generating and verifying one time passwords. It works for  both HOTP and TOTP, and includes QR Code provisioning

## OPTIONS

- **-s, --secret *\[SECRET\]***

  The shared secret

- **-c, --counter *\[COUNTER\]***

  The counter for counter-based hmac OTP

- **-t, --time**

  Use time-based OTP according to RFC 6238 (default)

- **-m, --hmac**

  Use counter-based OTP according to RFC 4226

- **-h, --help**

  Show help

## Examples

rotp --secret p4ssword                       # Generates a time-based one-time password

rotp --hmac --secret p4ssword --counter 42   # Generates a counter-based one-time password

## SEE ALSO

/usr/share/doc/ruby-rotp/index.html