Ce siguranta ofera protectia datelor prin parolarea arhivei ?

The latest versions of WinZIP and WinRar both use AES128 or 256 bit for encryption, this cipher is a security standard and safe from cracking as long as the password is sufficiently long and contains upper and lowercase letters, special characters and numbers.
The weakest link in .zip and .rar encrypted passwords is you, avoid reusing your passwords anywhere else and writing them down, with the exception maybe being a password manager you trust.
Make sure that you only encrypt .zip and .rar files with WinZip9.0 and above and Winrar3.0 and above as earlier versions have some vulnerability.
There are many companies out there promising to crack files encrypted with WinZip and WinRar, and they all rely on the same, either you using an old version of the file compression software, or you choosing a weak and easy to guess password, as long as you cover those two vulnerabilities, you are safe using WinZip or WinRar for encryption, my first choice would be WinRar since WinZip does not support file name encryption.
Note: 7Zip also AES-256 encryption including the filenames.

Okay si atunci de ce mai exista programe precum TrueCrypt care se lauda cu key de criptare de nustiu cat bits si asa mai departe?
De ce sa folosesti astfel de programe elaborate cand poti sa iti pui mult mai lesne si mai rapid o simpla parola la arhiva?

TrueCrypt a fost abandonat, dar funcționează fără probleme și acum pe partițiile non-sistem și pe cele sistem până la Windows 7 inclusiv.
Se pare că nici VeraCrypt nu merge pe partitiile sistem Windows 8 sau 10.

1. vrea sa zica OTP,
2. este pseudo-random
3. fiind pesudo -  poate fi reprodusa, deci 1 cade

pentru asta trebuie sa muncesti mai mult la 2, sa arunci destul zgomot in generarea unui SEED  pentru pseudo-generator

4. pentru asta este recomandat o solutie locala, si nu online pe nu stiu eu ce site-uri.