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Not when creating new archive, but on existing archive. I would also like to know how to do that in other archiver.

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You can do it by using this method . Tools > Convert Archives > Compression > Advanced > Set Password > then click ok and save . :)

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Awesome Santhosh! – Boris_yo Jan 25 at 15:59
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This is not possible as the password is generally used as the hash/similar for the file, so, anything that changes it will require an intensive operation to change all files.

The fastest and easiest thing by far is to extract all files and create a new archive with the security set.

Not saying it isn't possible to do what you want, but I haven't seen the option to do it.

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I added file to archive and set password which casused everything to update. Now archive is password protected, but has unnecessary file. I removed it and archive remained protected. – Boris_yo May 27 '11 at 12:26
@Boris - Technically what you did was exactly what you DID NOT want to do. You actually did create a new archive it was just invisible to you. – Ramhound May 27 '11 at 15:38
Then where is the old archive? In temp directory? – Boris_yo May 30 '11 at 13:55
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