---
name: "modhex"
section: "1"
platform: "linux"
package: "yubico-c"
version: "1.13-8"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/modhex"
---

# modhex(1)

convert data to/from modhex encoding

## NAME

modhex - convert data to/from modhex encoding

## SYNOPSIS

**modhex** \[-d\] \[-h\] *DATA*

## DESCRIPTION

Encode/decode modhex data *DATA* to binary and hex.

## OPTIONS

The string DATA is the data to convert.

- **-d**

  Decode data (the default is to encode data).

- **-h**

  Use hex encoding for all non-modhex data.

## EXAMPLES

ModHex encode ASCII-string "test":

```
modhex test
```

Decode ModHex data "ifhgieif" into ASCII string:

```
modhex -d ifhgieif
```

ModHex encode hex-encoded data "b565716f":

```
modhex -h b565716f
```

Decode ModHex data "nghgibhv" and print hex-encode data:

```
modhex -d -h nghgibhv
```

## SEE ALSO

YubiKeys can be obtained from Yubico: http://www.yubico.com/