There is 17 questions that deals with PKCS7, but there is no tag.

Is there a particular reason for this, or it was just not created ?

  • $\begingroup$ a pure guess: All the authors didn't have enough rep to create new tags? $\endgroup$
    – SEJPM
    Jun 19, 2015 at 21:24
  • $\begingroup$ It's my case and so a reason for this post, $\endgroup$
    – mpromonet
    Jun 19, 2015 at 21:26
  • $\begingroup$ It looks like nobody yet thought about creating such a tag... We don't even have a pkcs1 tag.... I'll just tag those questions pkcs7. $\endgroup$
    – SEJPM
    Jun 19, 2015 at 21:29
  • $\begingroup$ Not sure if PKCS7 is a good tag since most of these question refer to PKCS7 blockcipher padding, which is only a small part of PKCS7. Perhaps it's better to have one [PKCS7-padding] tag and another for CMS. $\endgroup$ Jun 19, 2015 at 22:42

1 Answer 1


PKCS#7 specifies the Cryptographic Message Syntax CMS. A small part of this is a padding for blockciphers, generalizing the padding from PKCS#5 to other block sizes.

Many questions mentioning PKCS#7 are about the block-cipher padding. I don't think it's useful to use the same tag for questions about the padding and CMS.

Introducing a tag for CMS seems useful, but I'd tend to name it not PKCS#7 to avoid confusion with the padding. I found 4 questions related to CMS.

Introducing a tag for PKCS#7 blockcipher padding is a bit dubious. I'd either keep it at the current , or introduce a separate , to distinguish it from the rather different RSA paddings.


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