• Review of KIISC
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• v.33 no.2
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• pp.5-11
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• 2023

양자는 물리학에서 더 이상 나눌 수 없는 물리량의 최소 단위이다. 양자에는 일반적인 물리법칙이 적용되지 않는 대신, 양자역학이라는 법칙이 적용된다. 이를 활용한 알고리즘으로 양자암호통신과 양자난수발생기가 존재한다. 양자암호통신은 기존 암호통신과는 다른 차원의 보안성을 제공하는 통신기술이다. 이는 양자를 관측하면 양자상태가 붕괴된다는 특징을 활용하여 도청자를 손쉽게 발견할 수 있게 한다. 양자난수발생기는 의사난수를 대체할 수 있는 알고리즘으로, 가장 완벽한 난수 장치로 여겨진다. 의사난수는 결정론적 알고리즘이기 때문에 값을 예측할 수 있는 반면, 양자난수는 자연 현상에서 뽑아내는 난수이기 때문에 예측할 수 없다. 다만 수학적 연산을 통해 계산하는 의사난수와는 다르게 양자난수는 난수를 추출할 장치가 필요하다. 본 고에서는 양자암호통신과 양자난수발생기의 최신 동향에 대해 확인해 보도록 한다.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.34 no.3
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• pp.365-378
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• 2024

The operating system (OS) of mobiles or embedded devices is based on the Linux kernel. These OSs request random numbers from the Linux kernel for system operation, such as encryption keys and security features. To provide random numbers reliably, the Linux kernel has a dedicated random number generator (Linux Pseudo Random Number Generator, LPRNG). Recently, LPRNG has undergone a major structural changes. However, despite the major changes, no security analysis has been published on the structure of the new LPRNG. Therefore, we analyze these structural changes as a preliminary study to utilize the security analysis of the new LPRNG. Furthermore, the differences between before and after the changes are divided into cryptographic and performance perspectives to identify elements that require security analysis. This result will help us understand the new LPRNG and serve as a base for security analysis.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2008.05a
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• pp.655-657
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• 2008

We suggest the digital voice encryption module using the pseudo random number generator and design the sorority device of a telephone using the module. The proposed method provides encryption method of the telephone against the third party. This encryption method uses pseudo random number generator which computes the encryption key using the shared secret key and the current time value.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.12 no.6
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• pp.1006-1009
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• 2008

We suggest the digital voice encryption module using the pseudo random number generator and design the security device of a telephone using the module. The proposed method provides encryption method of the telephone against the third party. This encryption method uses pseudo random number generator which computes the encryption key using the shared secret key and the current time value.

• Proceedings of the KAIS Fall Conference
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• 2004.06a
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• pp.209-212
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• 2004

실난수 발생기는 소프트웨어로 구현된 의사난수 발생기와는 달리 비결정적인 출력열을 제공하고, 알고리즘의 분해나 노출에 따른 위협이 없으며 의사난수발생기의 시드 값 관리가 불필요하다는 장점 등을 가지고 있다. 그러나 전자회고 잡음을 이용하는 경우 실난수 발생기는 온도나 주변 전자회로 기판 잡음 등으로 인해 지속적으로 편이성을 갖지 않는 안정된 출력 난수열을 얻는 것은 어렵다. 본 논문에서는 실난수 발생기에서 추출된 출력 난수열이 지속적으로 안정화된 출력 수열을 얻기 위한 방안을 연구하였다. 제시한 방안은 출력 난수열 "0"나 "1" 비트의 편이성을 가질 경우 FIPS 140-1에서 제시하고 있는 랜덤성의 조건을 만족하도록 출력 난수열의 랜덤성을 개선하였다.

• The Korean Journal of Applied Statistics
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• v.22 no.6
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• pp.1153-1165
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• 2009

There are many traditional statistical tests for randomness. We can consider recurrence plots as an exploratory graphical tool for evaluating randomness.

• The KIPS Transactions:PartC
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• v.9C no.6
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• pp.809-816
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• 2002

Cryptographic applications, such as data confidentiality and authentication, must be used for secure data communications. PRNG(Pseudo-Random Number Generator) is a basic cryptographic component which is supposed to be satisfied by criteria that we provable security and randomness properties. PRNG it used for generating an initial value or key value of cipher and security of whole cryptographic module depends on the security of PRNG. In this paper, we introduce an PRNG based on a block cipher and prove their security.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.27 no.3
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• pp.449-457
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• 2017

In this paper, we analyze the security and performance of the Quantis Quantum random number generator in terms of cryptography through experiments. The Quantis' post-processing is designed to output full-entropy via bit-matrix-vector multiplication based on mathematical background, and we used the min-entropy estimating test of NIST SP 800-90B so as to verify whether the output is full-entropy. Quantis minimizes the effect on the random bit rate by using an optimization technique for bit-matrix-vector multiplication, and compared the performance to conditioning functions of NIST SP 800-90B by measuring the random bit rate. Also, we have distinguished what is in Quantis' post-processing to the standard model of NIST in USA and BSI in Germany, and in case of applying Quantis to cryptographic systems in accordance with the CMVP standard, it is recommended to use the output of Quantis as the seed of the approved DRBG.