honninkakunin no ato de, pasuwaadorisetto wo suru.

It is a compound noun:

• 本人 = the person themself, the actual person concerned, the real account holder
• 確認 = confirmation, checking, verification

So 本人確認 literally means something like confirmation of the actual person, and in natural English it is usually identity verification or ID check.

In official, business, or online-service Japanese, 本人確認 is a very common set phrase.

This uses the pattern:

Noun + の + あとで = after N

So:

• 本人確認のあとで = after identity verification

Here, の connects the noun 本人確認 to あとで.

A useful comparison:

• 本人確認のあとで = after identity verification
• 本人確認をしたあとで = after doing identity verification

The first one is more compact and noun-based. The second one uses a full verb phrase.

By itself, あとで can mean later.

But in this sentence, it is part of the grammar pattern N の あとで, which means after N.

So here it does not just mean a vague later. It specifically marks sequence:

1. do identity verification
2. then do the password reset

So あとで here is functioning as after that step.

Yes, absolutely.

• 本人確認のあとで、...
• 本人確認をしたあとで、...

Both are natural.

The difference is mainly style:

• 本人確認のあとで is shorter and more compact
• 本人確認をしたあとで is more explicit because it spells out the action did identity verification

The version in your sentence sounds very natural in manuals, instructions, workflows, and system-related writing, where Japanese often prefers compact noun phrases.

パスワードリセット is a katakana compound, basically the Japanese equivalent of the English compound password reset.

Japanese often combines loanwords directly into one unit, especially in technical or computer-related language.

So:

• パスワードリセット = password reset

No の is necessary because this is treated as one established compound expression.

That said, you may also see:

• パスワードのリセット

This is also natural and may feel a little more transparent to learners, since it looks more like reset of the password.

Japanese often uses する with action nouns to mean do X.

So here:

• パスワードリセット = the action noun
• をする = do it

Together:

• パスワードリセットをする = do a password reset

This is the same kind of structure as:

• 勉強をする = do studying / study
• 確認をする = do a check / check
• 変更をする = make a change / change

So grammatically, it is a very normal pattern.

Often, yes.

Many speakers would naturally say:

• パスワードをリセットする

That means reset the password, with パスワード as the direct object of the verb リセットする.

Compared with that:

• パスワードリセットをする

sounds a bit more noun-heavy and procedural. It is still understandable and can sound appropriate in technical writing, workflow descriptions, support documentation, or UI-related instructions.

So the difference is roughly:

• パスワードをリセットする = smoother, more ordinary verbal phrasing
• パスワードリセットをする = more like naming the operation as a step in a process

It marks パスワードリセット as the thing being done.

So it is not marking password by itself. It is marking the whole action noun:

• パスワードリセット = password reset
• パスワードリセットをする = do the password reset

This is a common structure with する nouns.

Japanese often leaves the subject unstated when it is obvious from context.

So this sentence does not tell you directly who does the action. The implied subject could be:

• you if this is an instruction
• the staff member if this is part of a procedure
• the system if it is describing a system process

Japanese often focuses on the action and its order, not on explicitly naming the subject every time.

Not strictly.

The comma in:

• 本人確認のあとで、パスワードリセットをする。

simply makes the sentence easier to read by separating the after X part from the main action.

Without the comma, it would still be understandable:

• 本人確認のあとでパスワードリセットをする。

Japanese commas are often flexible and depend on readability and style.

No, standard Japanese is normally written without spaces:

• 本人確認のあとで、パスワードリセットをする。

Spaces are often added in learner materials to make the parts of the sentence easier to see.

So the spaced version is helpful for study, but the normal written form would not usually include those spaces.