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 Nov12 awarded Notable Question Nov16 awarded Popular Question Feb1 comment How do I derive the time complexity of encryption and decryption based on modular arithmetic? Thank you for all. but I have wondered simple in last algorithm MP = C * k^-1 mod N. I can say D = k ^ -1 mod N// here complexity equal O(n^2) and MP = D * C mod N // here complexity is O(n^2). Then Total time is O(n^2)+O(n^2)=O(2 n^2) = O(n^2)............Just to make sure Feb1 comment How do I derive the time complexity of encryption and decryption based on modular arithmetic? Thank you for all. Jan29 comment How do I derive the time complexity of encryption and decryption based on modular arithmetic? Mr Thomas you mean log N not log n where n number of bits in N . Jan29 revised How do I derive the time complexity of encryption and decryption based on modular arithmetic? added 288 characters in body Jan29 revised How do I derive the time complexity of encryption and decryption based on modular arithmetic? added 288 characters in body Jan29 asked How do I derive the time complexity of encryption and decryption based on modular arithmetic? Jan26 comment What is a block cipher? Thanks a lot MrOleksi. on this clarification is useful.Just have a simple question when the data size is less than 256-bit how to deal with it. Jan26 comment What is a block cipher? Thank you Mr Oleksi for your response. If I have data length of 512 bit and I have a 256-bit key length and encryption result rather (plain text) is 256 bit after decrypt process. I able to encrypt data has max length 256 bits. I can say that the length of block cipher is 256 bits. Because should be divide 512 bit to two chunk Each chunk has 256 bits. If that is true I am hope. please response me. Jan24 comment What is a block cipher? Can I say DES cryptography algorithm type of block cipher. Jan24 comment What is a block cipher? thank you for your response. Can I say RSA algorithm type of block cipher Jan24 asked What is a block cipher? Jan23 awarded Editor Jan22 comment How can I calculate the time complexity of modular arithmetic? Can I say that a . b mod n is takes less time from a^-1 . b mod n. If That's true I'm very hope. Jan22 awarded Commentator Jan22 comment How compared encryption algorithm in terms of efficiency thank you mr Thomas .BUT WHAT IS IMHO. If Can you give me link to read about IMHO. THANK YOU AGAIN Mr THOMAS. Jan21 comment How can I calculate the time complexity of modular arithmetic? Thank you for your answer. In my thesis I have two algorithm first encrypt and second decrypt. I want know best in time complexity. Is it encrypt or decrypt? Is it good method for compare? or tell me any other way for compared Jan21 comment How compared encryption algorithm in terms of efficiency Is there general way to calculate speed performance for encrypt and decrypt.to be able to compare between any two algorithms in terms of speed? I need that for my thesis. Jan21 comment How compared encryption algorithm in terms of efficiency Compute time it isn't good measured. because give me time variable each runtime program. I want know. Is calculate Time Complexity good measured. I want link for any book to learn me. Thanks for all.