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Some unrelated questions about tags:

  1. I see has resurfaced. Its been created and removed before, I think I've done both at least once. Should it be kept this time? Should old questions about it be retagged?

  2. I noticed has basically the same description as , except a bit broader. Should one be a synonym for the other?

  3. What's up with ?

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    $\begingroup$ With 11 occurrences in questions siphash looks OK to me as we have less used tags.... $\endgroup$ – SEJPM Aug 19 '15 at 13:32
  • $\begingroup$ Well, I can't see any useful difference between historic and classical cipher. $\endgroup$ – SEJPM Aug 19 '15 at 13:35
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  1. yes and yes
  2. I like the sound of and would make a synonym
  3. Message integrity is a key application of cryptography, as such we probably want the tag, but I fear it may be overused.
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  • $\begingroup$ 2. I guess there might be "historic" questions that aren't about ciphers, but I didn't notice any in the currently tagged questions. 3. As I wrote in comments to a now deleted answer, by main problem with integrity is that the excerpt is poor and gives no guidance when to use it. $\endgroup$ – otus Aug 22 '15 at 6:32
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Regarding , the main differences between that tag and are IMO twofold:

  1. Some might argue that electromechanical ciphers like the Enigma don't really count as "classical ciphers," as the term is commonly used. Then again, the opposite could be argued too.

  2. Also arguably, classical ciphers may include "toy ciphers" that were never deployed historically.

I'm not convinced that these marginal differences really justify keeping the tags separate, but if we do merge them, we should at least take a closer look at these 11 questions first. (Some of them might benefit from retagging with instead of .)

Update: Some of those questions have since been retagged. I think the remaining ones do fit under at least as well as they do under their current tags. Thus, I'm now in favor of merging into (and have just suggested a tag synonym to that effect).

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Since no one has chimed in against , I've written a tag wiki and will tag the old questions where it's relevant.

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