What is the standard minimum and maximum length of the username, password and email?
I have a problem with this question, because it prefers to be a standard, And this value will be the same in all the services. / P>
I do not think it is useful for applying maximum length for any of these fields, especially the password field. With password hashing, there is no place advantage by restricting the length of the password, the reason for limiting the length of the minimum password, but what should be the minimum on the security of the service.
With an email address, you can not predict how long your users will know, nor in a nutshell: who are you saying that a.very.long.address@some.subdomain .of.makealongeremailaddress.com is not valid, and on the contrary, that Twitter TK Will not start selling email aliases?
User names are a bit more difficult, but again I argue that there is no benefit to limiting the length. If your service is likely to be popular, (like Google) you can benefit from stopping the race to get a small vanity username, but especially if you are popular, there is no benefit to limiting the length and If you do, you can prevent your users from finding a suitable name that is not already taken (CF "No-Age-Big-Age-Medium-Size-Jock-On-Big-Than-We-Jake- Jock ").
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