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I have a program that uses a custom algorithm to encrypt a message This algorithm is called a cipher. There are plenty well known ciphers that are considered secure. If you have a "custom cipher" then you're either using something of your own design. Using proprietary schemes is not recommended except for learning purposes. My program support multiple ...


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The three-pass authentication protocol defined in ISO/IEC 9798-2 at 5.2.2. and it is defined as follows; $\text{B}$ generated random $R_B$ and sends to $\text{A}$; $$\text{B}\xrightarrow{R_B\|\text{Text1}}\text{A}$$ $\text{A}$ generated random $R_A$ and sends to $\text{B}$; $$\text{B} \xleftarrow{\text{TokenAB}\;=\;\text{Text3}\|eK_{AB}(R_A\|R_B\|B\|\text{...


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