How to create a strong password?

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The need to protect personal or commercial data online requires users to use strong passwords for their accounts. However, to create them, you must have some specialized knowledge or follow one of the many user instructions created, for example, by financial institutions in accordance with the existing security policy. Here are some recommendations for creating a strong password for experienced and ordinary Internet users.

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What is a strong password
Ideally, a strong password is a hidden code for user identification that is impossible to crack or guess. However, as theory and practice show, any password can be cracked - it's only a matter of time. Therefore, it is appropriate to talk here only about the conditional reliability of a password, which will allow the web system to "hold out" for a limited period of time without being hacked. The length of this time period directly depends on the complexity of the code used - the more complex it is, the more reliable.

Thus, the concepts of “complexity” and “reliability” of a password are in a dialectical interdependence.

In the information industry, password complexity is most often assessed using the value of the information entropy of symbols, measured in bits. The higher it is, the higher the level of complexity. Moreover, the total information entropy is the algebraic sum of the entropies included in the word of symbols.

The general formula for calculating the complexity of a random password is as follows:

H = log 2 N L = Llog 2 N

Where H is the password complexity (entropy), measured in bits; N is the number of characters that can be used to form a secret combination, that is, the set of acceptable characters; L is the number of characters in a word.