MD5 fingerprints of SSH keys are displayed as colon-separated hex strings, which is a convenient format for reading them over the phone. SHA256 fingerprints are displayed as base64, which is much more awkward because the reader has to specify whether every letter is upper or lower case, and the absence of grouping characters makes it easy to lose one's place while reading. Please provide a flag to display them in an alternative format such as hex, base32, or base36, broken into reasonable groups.