Byoungcheon Lee
Information and Communications University
Distributed computingCryptographyComputer securityComputer scienceTheoretical computer science
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Publications 39
Aug 1, 2014 in SECRYPT (International Conference on Security and Cryptography)
#1Byoungcheon LeeH-Index: 18
In ubiquitous computing environment it is common that a user owns and uses multiple computing devices, but managing cryptographic keys in those devices is a complicated matter. If certificate-based cryptography (PKI) is used such that each device has independent certificate, then user has to be involved in multiple certificate issuing processes with certification authorities (CA) and has to keep multiple private keys securely. If a single user certificate is copied and shared in multiple user de...
1 CitationsSource
#1Byoungcheon LeeH-Index: 18
Secret signatures, proposed by Lee \textit{et al.} \cite{LCYY07,LLK09}, provide signature privacy and public provability at the same time. Using these schemes a signer can send his signature secretly to a designated receiver such that only the designated receiver can verify the signature. Moreover, if any argument occurs between them, the validity of the secret signature can be proven publicly either by the signer or the receiver. But in these schemes one of the drawback is that the signer has t...
Aug 1, 2012 in UbiComp (Ubiquitous Computing)
#1Divyan Munirathnam Konidala (KAIST)H-Index: 1
#2Made Harta Dwijaksara (KAIST)H-Index: 2
Last. Soontae Kim (KAIST)H-Index: 16
view all 7 authors...
Credit/debit card payment transactions do not protect the privacy of the customer. Once the card is handed over to the merchant for payment processing, customers are "no longer in control" on how their card details and money are handled. This leads to card fraud, identity theft, and customer profiling. Therefore, for those customers who value their privacy and security of their payment transactions, this paper proposes a choice--an alternate mobile payment model called "Pre-Paid Mobile HTTPS-bas...
13 CitationsSource
#1Xiaofeng Chen (Xidian University)H-Index: 46
#2Qianhong Wu (WHU: Wuhan University)H-Index: 17
Last. Kwangjo Kim (KAIST)H-Index: 34
view all 8 authors...
It is considered to be the most suitable solution for large scale elections to design an electronic voting scheme using blind signatures and anonymous channels. Based on this framework, Okamoto first proposed a receipt-free voting scheme [30] for large scale elections. However, in the following paper, Okamoto [31] proved that the scheme [30] was not receipt-free and presented two improved schemes. One scheme requires the help of the parameter registration committee and the other needs a stronger...
20 CitationsSource
#1Divyan M. Konidala (KAIST)H-Index: 5
#2Daeyoung Kim (KAIST)H-Index: 26
Last. Byoungcheon LeeH-Index: 18
view all 4 authors...
The concept of Smart-Homes is becoming more and more popular. It is anticipated that Radio Frequency IDentification (RFID) technology will play a major role in such environments. We can find many previously proposed schemes that focus solely on: authentication between the RFID tags and readers, and user privacy protection from malicious readers. There has also been much talk of a very popular RFID application: a refrigerator/bookshelf that can scan and list out the details of its items on its di...
20 CitationsSource
Feb 1, 2010 in ARES (Availability, Reliability and Security)
#1Byoungcheon LeeH-Index: 18
Certificate-based cryptography and ID-based cryptography have been designed under different theoretical backgrounds and they have their own advantages and drawbacks, but there have been few works which try to provide them together in an efficient way. Chen et al. [4] considered a hybrid scheme of public key infrastructure (PKI) and ID-based encryption (IBE), and also discussed various trust relationship among multiple authorities, but they have not discussed more in-depth implementation issues o...
8 CitationsSource
#1Byoungcheon LeeH-Index: 18
#2Jin Li (IIT: Illinois Institute of Technology)H-Index: 43
Last. Kwangjo Kim (KAIST)H-Index: 34
view all 3 authors...
Secret signature, proposed by Lee et al. [11], is a new signature scheme which provides signature privacy and public provability together. Using the secret signature scheme a signer can send his signature secretly to a specific receiver such that only the designated receiver can verify the signature. If any argument occurs between them, the validity of the secret signature can be proven publicly either by the signer or the receiver. Thus it can be used as an important cryptographic primitive to ...
2 CitationsSource
#1Byoungcheon LeeH-Index: 18
#2Kim-Kwang Raymond Choo (Australian Institute of Criminology)H-Index: 46
Last. Seung-Jae YooH-Index: 3
view all 4 authors...
Digital signatures provide authentication and nonrepudiation in a public way in the sense that anyone can verify the validity of a digital signature using the corresponding public key. In this paper, we consider the issues of (1) signature privacy and (2) the corresponding public provability of signature. We propose a new digital signature variant, secret signature, which provides authentication and nonrepudiation to the designated receiver only. If required, the correctness of the secret signat...
3 CitationsSource
#1Kun Peng (QUT: Queensland University of Technology)H-Index: 13
#2Colin Boyd (QUT: Queensland University of Technology)H-Index: 38
Last. Byoungcheon LeeH-Index: 18
view all 4 authors...
A new cryptographic protocol —ciphertext comparison— can compare two ciphertexts without revealing the two encrypted messages. Correctness of the comparison can be publicly verified. This technique provides an efficient and publicly verifiable solution to the famous millionaire problem. It is the first solution to the millionaire problem to output a precise result (the two messages are equal or which is larger). Privacy in this new solution is achieved with an overwhelmingly large probability an...
13 CitationsSource
#1Hwankoo Kim (Hoseo University)H-Index: 8
#2Bongjoo Park (Hoseo University)H-Index: 1
Last. DongGook ParkH-Index: 7
view all 5 authors...
In this paper, we review briefly Akl and Taylor’s cryptographic solution of multilevel security problem. We propose new key management systems for multilevel security using various one-way functions.
6 CitationsSource