As with [this older related question](https://mathoverflow.net/questions/56200/proper-way-to-deal-with-papers-youve-already-refereed), question anonymous for obvious reasons.

If I have been asked to review the same paper twice, is it OK to acknowledge in my review that I am the same person as one of the referees from last time?  I'm sure cryptographers would frown on that sort of thing, but it's not clear that there is actually a practical problem with this.

Thanks!