Introduction RSA is a public-key cryptosystem developed by Ron Rivest, Adi Shamir and Leonard Adleman and published in 1977. The encryption key (public key)

According to the great well-known Euler’s formula: eiθ=cos⁡θ+isin⁡θ Let θ=π/2, then: eiπ/2=cos(π/2)+isin(π/2)=0+i×1=i Now, doing a substitution i with eiπ/2: ii=(eiπ/2)i=(eπ/2)i2=e−π/2=0.207879… How beautiful!

This technique gained popularity in the early days of computer graphics when processing power was limited. It’s an approximation method

Have you ever wondered how Google Authenticator works? Or I wondered how the bank could use a token to generate