May 26, 2018

Perl5 interface to a fingerprint in “bubble babble” format

DigestBubbleBabble takes a message digest generated by either of the MD5 or SHA-1 message digest algorithms and creates a fingerprint of that digest in “bubble babble” format. Bubble babble is a method of representing a message digest as a string of “real” words, to make the fingerprint easier to remember. The “words” are not necessarily real words, but they look more like words than a string of hex characters.

Bubble babble fingerprinting is used by the SSH2 suite and, consequently, by NetSSHPerl, the Perl SSH implementation to display easy-to-remember key fingerprints. The key a DSA or RSA key is converted into a textual form, digested using DigestSHA1, and run through bubblebabble to create the key fingerprint.

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