New answers tagged one-time-password
The question is not if it's "as safe as" traditional password: it's not meant to achieve the same thing. For telegram, a "user" is a phone number: anyone having access to that phone number is, by definition, an authorized user. In other words, it delegates the security of you account to you and your phone company.
For the rest use formula: f(n)=(5*(n-1)) mod 9 For example if you have f(5)=7 the next step is f(x)=(5*7) mod 9 = 35 mod 9 = 8 and so on
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