Youtube: "Unable to decrypt signature, key length 93 not supported"

[japhy-]

japhy@blackbox:~/blackboxtv/public$ youtube-dl --verbose -g Lf2db4hD6zI
[debug] System config: []
[debug] User config: []
[debug] Command-line args: ['--verbose', '-g', 'Lf2db4hD6zI']
[debug] youtube-dl version 2013.09.17
[debug] Python version 2.7.4 - Linux-3.8.0-30-generic-i686-with-Ubuntu-13.04-raring
[debug] Proxy map: {}
ERROR: Unable to decrypt signature, key length 93 not supported; retrying might work; please report this issue on https:
//yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag and include its complete output. Make sure you are using the latest version; type youtube-dl -U to update.
Traceback (most recent call last):
File "/usr/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 321, in extract_info
ie_result = ie.extract(url)
File "/usr/bin/youtube-dl/youtube_dl/extractor/common.py", line 103, in extract
return self._real_extract(url)
File "/usr/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 800, in _real_extract
signature = self._decrypt_signature(encrypted_sig)
File "/usr/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 447, in _decrypt_signature
raise ExtractorError(u'Unable to decrypt signature, key length %d not supported; retrying might work' % (len(s)))
ExtractorError: Unable to decrypt signature, key length 93 not supported; retrying might work; please report this issue
on https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag and include its complete output. Make sure you are using the latest version; type youtube-dl -U to update.

[jaimeMF]

Duplicate of #1461, thanks for reporting

[srph]

I encounter a similar situation. Additionally, every time I update (youtube-dl -U), I receive the message:

It looks like you installed youtube-dl with a package manager, pip, setup.py or a tarball. Please use that to update.

[phihag]

@SeraphiPod That means the update failed. Please open a new issue where you also explain how you have installed youtube-dl.