Using Cryptography to Protect Data in Computer Networks: case study Vsevolod Ievgiienko National Taras Shevchenko University of Kiev Faculty of Cybernetics.

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Presentation transcript:

Using Cryptography to Protect Data in Computer Networks: case study Vsevolod Ievgiienko National Taras Shevchenko University of Kiev Faculty of Cybernetics Ukraine

Introduction Information security Business Banks Online payments Individual persons

Introduction Computer System Reliability Security Safety … Cryptography … …

Security Security is considered as a part of reliability and survivability problem “Who watches the watchmen?”

Safety Optimization problem  x - system configuration  C - system cost  R - system reliability index  S - system safety index

Information security problems T ypes of violations Disconnection Interception Modification Falsification

Information security problems Violations Active Passive - imitation- stream analysis - recreation - modification - hindering in service

Information security problems System security services Confidentiality Authentication Integrity Impossibility of refuse

Algorithms Symmetric (DES, AES, Blowfish, Serpent, Twofish) E – encryption D – decryption К – secret key М – message С – encrypted message

Algorithms Asymmetric (RSA, Elgamal, Elliptic Curves Cryptography) E – encryption D – decryption КUx – public key (user X) КRx – private key (user X) М – message С – encrypted message

Principles of planning Principle of different types Use a few algorithms of one type that have a different structure

Encryption software solution Remote encrypted file system Secret messaging

Encryption algorithms RSA with up to 4096-bit keys Digital signatures based on RSA Trusted timestamping X steps authentication Blowfish with 448-bit keys SHA-256 and SHA-512 hash functions HMAC-SHA-256 modified ANSI X9.17 pseudo-random numbers generator PKCS5 for making keys from passwords Deflate compression algorithm CRC32 checksums DoD M for data wiping

Sources “Reliability: past, present, future”, I. Ushakov “Applied Cryptography”, B. Schneier “Handbook of Applied Cryptography”, A. Menezes, P. van Oorschot, S. Vanstone

THE END Questions? Contacts: Tel: ICQ: