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2013-05-10 13:24:40 +0200 | asked a question | The sage example in Crypto (Stallings) When I doing the exercise of the textbook in Append -C I confront a question, it says " Write a function that takes a bitlength n and generates a modulus N of bitlength n and g less than N and relatively prime to it. " I am confused about the meaning does is mean that I have to use the bitlength n and generate the modulus N? ( len(bin(n)) % N)? |
2013-05-08 15:54:25 +0200 | received badge | ● Scholar (source) |
2013-05-08 15:54:25 +0200 | marked best answer | Xor the output from SDES The output of the |
2013-05-08 12:46:35 +0200 | commented answer | Xor the output from SDES its amazing!! may I ask where I could find related information of ZZ RR and zip?? |
2013-05-08 02:06:33 +0200 | asked a question | Xor the output from SDES Hi again, From the Stalling's cryptography textbook I use the xor function a following : def XorBlock(block1, block2): it works well when I use it to xor 2 blocks. But when I wanna xor the output from sDES function as following: it will replies TypeError: unsupported operand parent(s) for '+': 'Free binary string monoid' and 'Integer Ring' So, how could I store the sdes.encrypt(T,K) into a pure list so that the XorBlock could work??? Thank you !!!! |
2013-05-07 18:19:59 +0200 | asked a question | How to design a loop If I have designed a pseudo random number generator(PRNG), but I just cant output the random number from the first round ( from the input seed), how could I design a loop that could help me run the number of round I need in the PRNG?? |
2013-05-02 15:51:02 +0200 | asked a question | How do we get the current time? I would like to use the current time instead of a password as a key for some encryption. Does anyone know how to obtain the current time with Sage? Thank you!!!! |
2013-04-18 16:43:18 +0200 | received badge | ● Editor (source) |
2013-04-18 15:49:56 +0200 | asked a question | About the output of simpified DES Here is the Sage code copy from Cryptography and Network Security Principle and Practice 5th by Stallings in Appendix B of SDES Sage code: (more) |
2013-04-03 16:48:04 +0200 | commented answer | pretty dumb question but I don't know yeah u find the point!! |
2013-04-03 16:48:04 +0200 | commented answer | pretty dumb question but I don't know yeah u find the point!! I'm really new to python and sage. Don't know that form bring much influence to the result, thank you very much |
2013-04-03 16:47:35 +0200 | received badge | ● Supporter (source) |
2013-04-03 15:37:54 +0200 | asked a question | pretty dumb question but I don't know (but when I enter ) why does it reply me ' ' but ciphertext...... |