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Category Archives: Networks and telecommunications

Posts related to networks or telecommunications topic.

New article pre-published in “Quantum Information Processing” journal

September 3, 2017

Implementation of quantum key distribution network simulation module in the network simulator NS-3 Authors Miralem Mehic, Department of Telecommunications, VSB-Technical University of Ostrava, Ostrava-Poruba, Czech Republic Oliver Maurhart, Digital Safety and Security Department, AIT Austrian Institute of Technology GmbH, Vienna, Austria Stefan Rass, Universitaet Klagenfurt, Institute of Applied Informatics, System Security Group, Klagenfurt, Austria Miroslav Voznak, Department of Telecommunications, VSB-Technical University of Ostrava, Ostrava-Poruba, Czech Republic Abstract As the research in quantum key distribution […]

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Clearing Linux disk cache

November 28, 2016

For experimentation, it’s very convenient to be able to drop the disk cache. For this, we can use the special file /proc/sys/vm/drop_caches. By writing 3 to it, we can clear most of the disk cache: $ free -m total used free shared buffers cached Mem: 1504 1471 33 0 36 801 -/+ buffers/cache: 633 871 […]

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Socket::SetIpTos in NS-3 ver.3.26

November 10, 2016

One of the changes between ns-3 ver 3.25 and ver 3.26 is that now it is possible to set TOS value to the address. Yes, you read it right, TOS value to the address. Official Doxygen states following: https://www.nsnam.org/docs/release/3.26/models/html/sockets-api.html The native sockets API for ns-3 provides two public methods (of the Socket base class): void […]

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Crypto++ VMAC issue

August 3, 2016

Well, I tried code available on http://www.cryptopp.com/wiki/VMAC in my NS-3 project on the following way: inputString = base64_encode (inputString); byte* Kkey = key->GetKey(); byte digestBytes[key->GetSize()]; byte digestBytes2[key->GetSize()]; CryptoPP::VMAC vmac; vmac.SetKeyWithIV(Kkey, key->GetSize(), m_iv, CryptoPP::AES::BLOCKSIZE); vmac.CalculateDigest(digestBytes, (byte *) inputString.c_str(), inputString.length()); //VMAC Verification vmac.SetKeyWithIV(Kkey, key->GetSize(), m_iv, CryptoPP::AES::BLOCKSIZE); vmac.CalculateDigest(digestBytes2, (byte *) inputString.c_str(), inputString.length()); std::string outputString = std::string( (char*)digestBytes, sizeof(digestBytes […]

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