• KSII Transactions on Internet and Information Systems (TIIS)
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• 제13권3호
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• pp.1284-1297
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• 2019

The network environment is presently becoming very increased. Accordingly, the study of traffic classification for network management is becoming difficult. Automatic signature extraction system is a hot topic in the field of traffic classification research. However, existing automatic payload signature generation systems suffer problems such as semi-automatic system, generating of disposable signatures, generating of false-positive signatures and signatures are not kept up to date. Therefore, we provide a fully automatic signature update system that automatically performs all the processes, such as traffic collection, signature generation, signature management and signature verification. The step of traffic collection automatically collects ground-truth traffic through the traffic measurement agent (TMA) and traffic management server (TMS). The step of signature management removes unnecessary signatures. The step of signature generation generates new signatures. Finally, the step of signature verification removes the false-positive signatures. The proposed system can solve the problems of existing systems. The result of this system to a campus network showed that, in the case of four applications, high recall values and low false-positive rates can be maintained.

• International Journal of Fuzzy Logic and Intelligent Systems
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• 제4권3호
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• pp.271-276
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• 2004

This paper is a research on the dynamic signature verification of error rate which are false rejection rate and false acceptance rate, the size of signature verification engine, the size of the characteristic vectors of a signature, the ability to distinguish similar signatures, the processing speed and so on. Also, we present our efficient user interface and performance results.

• International Journal of Fuzzy Logic and Intelligent Systems
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• 제3권1호
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• pp.27-31
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• 2003

This paper proposes a robust on-line signature verification system based on a new segmentation method and fusion scheme. The proposed segmentation method resolves the problem of segment-to-segment comparison where the variation between reference signature and input signature causes the errors in the location and the number of segments. In addition, the fusion scheme is adopted, which discriminates genuineness by calculating each feature vector's fuzzy membership degree yielded from the proposed segmentation method. Experimental results show that the proposed signature verification system has lower False Reject Rate(FRR) for genuine signature and False Accept Rate(FAR) for forgery signature.

• 전자공학회논문지C
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• 제35C권3호
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• pp.32-45
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• 1998

A partitioned signature file is an enhancement of the signature file that divides all the signatures into blocks in such a way that each block contains the signatures with the same key. Its directory storesall the keys as meta information for avoiding unnecessary block accesses by examming them first before the acture searching of the blocks.. Efficient directory management is very important in large databasse environments since ist size gets larger proportionally to that of the database. In this paper, we first point out the problems in the directory management methods of the previous partitioned signature files, and then present a new one solving them. OUr method offers good features in the followint three aspects: (1) suitability for large database environments, (2) adaptability to dynamic situations, and (3) storage overhead for the directory. Moreover, we can seamlessly integrate it as a subcomponent into previously-developed general-purpose storage engines. These features show that our method is applicableto signature-based access structures for the content-based retrieval in various multimedia applications such as hypermedia systems, digital library systems, multimedia document systems, multimedia mailing systems, and so on.

• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 2005년도 춘계학술대회 학술발표 논문집 제15권 제1호
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• pp.419-423
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• 2005

This paper is a research on feature extraction and comparison method of dynamic (on-line) signature verification. We suggest desirable feature information and modified DTW(Dynamic Time Warping) and describe the performance results of our enhanced dynamic signature verification system.

• 한국지능시스템학회논문지
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• 제5권4호
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• pp.33-40
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• 1995

This paper delas with the detection of freehand forgeries of signatures based on the averaged directional amplitudes of gradient vetor which are related to the overall shape of the handwritten signature and fuzzy ARTMAP neural network classifier. In the first step, signature images are extracted from the background by a process involving noise reduction and automatic thresholding. Next, twelve directional amplitudes of gradient vector for each pixel on the signature line are measure and averaged through the entire signature image. With these twelve averaged directional gradient amplitudes, the fuzzy ARTMAP neural network is trained and tested for the detection of freehand forgeries of singatures. The experimental results show that the fuzzy ARTMAP neural network cna lcassify a signature whether genuine or forged with greater than 95% overall accuracy.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제8권3호
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• pp.1157-1177
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• 2014

Convertible authenticated encryption (CAE) schemes enable the signer to send a confidential message and its corresponding signature to the designated recipient. The recipient can also convert the signature into a conventional one which can be verified by anyone. Integrating the properties of self-certified public key systems, this paper presents efficient and computationally indistinguishable self-certified CAE schemes for strengthening the security of E-Commerce applications. Additionally, we also adapt the proposed schemes to elliptic curve systems for facilitating the applications of limited computing power and insufficient storage space. The proposed schemes are secure against known existential active attacks, satisfy the semantic security requirement, and have the following advantages: (i) No extra certificate is required since the tasks of authenticating the public key and verifying the signature can be simultaneously carried out within one step, which helps reducing computation efforts and communication overheads. (ii) In case of a later dispute, the recipient can convert the signature into an ordinary one for the public arbitration. (iii) The signature conversion can be solely performed by the recipient without additional computation efforts or communication overheads. (iv) The recipient of the signature can prove himself, if needed, to anyone that he is actually the designated recipient.

• 한국정보과학회논문지:시스템및이론
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• 제29권5호
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• pp.299-306
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• 2002

'부분은닉서명(Partially Blind Signature)'기법은 전자화폐나 전자투표와 같이 사용자의 프라이버시가 중요시되는 응용에서 사용된다. 본 논문에서는 서명 요청자의 계산량을 줄이는 RSA 알고리즘에 기반한 부분은닉서명 기법을 제안한다. 서명 요청자는 메시지를 은닉하여 서명자에게 전송하고 서명자가 생성한 중간 서명으로부터 최종 서명을 생성하는 과정에서 계산을 필요로 한다. 논문에서 제안하고 있는 기법은 서명 요청자가 적은 계산량을 필요로 하는 모듈러 합과 곱 연산만으로 최종 서명을 계산할 수 있게 하므로 서명 요청자의 계산량을 많이 감소시킨다. 따라서, 이동통신 기기나 스마트카드, 전자지갑 같이 계산능력이 떨어지는 장치들에서 사용하기에 적합하다.

• 한국정보과학회논문지:정보통신
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• 제37권4호
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• pp.255-262
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• 2010

공표되지 않은 취약성을 이용하는 악성코드에 의한 제로데이 공격에 대응하기 위한 목적으로 최근 시그니처 자동생성 시스템이 개발되었다. 자동 생성된 시그니처의 효용성을 높이기 위해서는 탐지 정확도가 우수한 고품질 시그니처를 식별하여 보안시스템에 적시에 공급할 수 있어야 한다. 이러한 자동화된 시그니처 교환 및 분배, 갱신 작업은 네트워크의 관리 경계를 넘어 보안상 안전한 방법으로 범용성 있게 이루어져야 하며, 보안시스템의 성능저하를 초래하는 시그니처 집합의 노이즈를 제거할 수 있어야 한다. 본 논문은 시그니처 재평가를 통해 고품질 시그니처의 식별과 공유를 지원하는 시스템 구조를 제시하고 시그니처의 교환 및 분배, 갱신을 다루는 알고리즘을 제시한다. 제시한 시스템과 알고리즘을 테스트베드로 구현 실험한 결과, 보안시스템에서 시그니처 집합의 노이즈를 줄이면서 제로데이 공격 대응력을 향상시키는 시그니처의 축적이 자동화됨을 확인하였다. 본 논문에서 제안한 시스템 구조와 알고리즘은 제로데이 공격 대응력을 향상시키는 시그니처 자동 공유 프레임워크로 활용할 수 있으리라 기대한다.

• Journal of Information Processing Systems
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• 제7권1호
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• pp.159-172
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• 2011

A designated verifier signature is a special type of digital signature, which convinces a designated verifier that she has signed a message in such a way that the designated verifier cannot transfer the signature to a third party. A strong designated verifier signature scheme enhances the privacy of the signer such that no one but the designated verifier can verify the signer's signatures. In this paper we present two generic frame works for constructing strong designated verifier signature schemes from any secure ring signature scheme and any deniable one-pass authenticated key exchange protocol, respectively. Compared with similar protocols, the instantiations of our construction achieve improved efficiency.