Kyushu University Academic Staff Educational and Research Activities Database
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Yoshiaki Kasahara Last modified date:2023.11.27





Homepage
https://kyushu-u.elsevierpure.com/en/persons/yoshiaki-kasahara
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Academic Degree
Doctor of Engineering
Field of Specialization
Internet
Outline Activities
Research topics

* Information service administration/monitoring/optimization for
better service quality

Information services are abundant in the Internet. In Kyushu University, there are various kinds of information and communication services for faculty and students through campus network, too. Due to rapidly inflating service infrastructure, some servers tend to be overlooked and are under-performing. Virtualization technology allows to introduce new services more easily, but it introduces more layers and complexity for administration.

I'm studying to improve the situation through experiences of the real service administration and operation.

* Intrusion and back door detection based on network traffic monitoring
Incidents and its damage caused by malicious activities over the Internet is increasing. To protect users from these activities, we need layered protection among end-nodes and network itself.

In this research, I focus on network-level countermeasures. As a backbone administrator of an organization, I'm studying methods to observe and detect malicious activities inside our own network. To achieve this, I'm studying methods to classify network traffic at the edge of our network without using specific signatures. Using such methods, I want to detect unknown or malicious activities which are hard to detect by traditional signature based intrusion detection system.

* other activities
I'm working on administration and maintanance of Kyushu University campus network, including detection of malicious activities inside our network, and enlightenment of end users about network security, etc.
Research
Research Interests
  • Information service administration/monitoring/optimization for better service quality
    keyword : Information System, Server Administration/Operation, Virtualization
    2012.04.
  • Intrusion and Anomaly Detection based on Network Monitoring
    keyword : Internet, Network Management and Operation, Intrusion Detection, Network Security
    2001.04Intrusion and/or anomaly detection based on network traffic monitoring, including signature based detection and statistical detection..
Academic Activities
Papers
1. Yoshiaki Kasahara, End of Basic Authentication and Migration to Modern Authentication for Exchange Online, Proceedings of the 2023 ACM SIGUCCS Annual Conference, 10.1145/3539811.3579560, 2023.03, At Kyushu University, Information Infrastructure Initiative provides an email se
rvice named "Primary Mail Service" for students and staff members with Microsoft
Office 365 Exchange Online. On September 20th, 2019, Microsoft announced the en
d of support for Basic Authentication for Exchange Online, which is considered v
ulnerable to identity leakages such as phishing and malware attacks. Microsoft w
ould require users to use Modern Authentication such as Exchange protocol or OAu
th 2.0 authorization with IMAP, POP, and SMTP. Historically we had instructed ou
r users to use IMAP or POP and SMTP protocols for their email applications, incl
uding Microsoft Outlook and Mozilla Thunderbird, so disabling Basic Authenticati
on would significantly impact our user population. In September 2021, Microsoft
announced the end of September 2022 as the hard deadline for disabling Basic Aut
hentication. Based on available information, we prepared migration documents fro
m Basic Authentication to Modern Authentication and started to notify users to a
bandon Basic Authentication. Sending messages to users did not seem to be effect
ive after a couple of notifications, so we tried to temporarily disable Basic Au
thentication to realize the remaining users through authentication failures. In
this paper, we would like to share our experiences about the effect of retiring
Basic Authentication for Exchange Online on our service and users..
2. , [URL].
3. A Supplementation Method for Delegation of Address Management on a Cloud Email Service
In providing organizational email service, the use of cloud email services contributes to reducing operation and management costs, generally. In most cloud email services, the management of a certain part of email addresses is not delegatable to administrators of organizational units, but this causes operational load concentration on organizational service administrators in large-scale organizations. For solving this issue, this study aims to enable delegations of email address management to administrators of organizational units. This article introduces a method for delegation of email address management and a supplemental system onto a cloud email service. The proposed method divides the management of email addresses within internet subdomains for organizational units from account administration and delegates the email address management to subdomain administrators. The present system for email address management is designed based on microservice architecture and configured in serverless. This microservice architecture and serverless configuration reduces operation and management costs and contributes to the maintainability and extensibility of the present system. Furthermore, the use of an identity-as-a-service for authentification, authorization and storing privilege information ensures confidentiality and security of system accounts., [URL].
4. Migrate Legacy Email Services in Kyushu University to Exchange Online.
In Kyushu University, Information Infrastructure Initiative provides an email service for students and staff members, called “Primary Mail Service”. We had operated an on-premises system for this service, and the lifetime of this system would end in early 2019. We needed to reduce costs for replacing this system because our university had just finished a major campus migration. We compared some options such as building a yet another on-premise system and migrating to a cloud-based email service and finally gave up the on-premise option because we couldn’t afford replacement and operational costs of another on-premises system anymore. We selected Microsoft Exchange Online as the new service mainly because we already had a contract with Microsoft and been operating an Office 365 tenant. We had additional requirements for user provisioning and services which were not available in Exchange Online, so we had to implement and maintain additional systems on top of it. On December 18th, 2018, we successfully migrated the email service to Exchange Online. By coincidence, Kyushu University Administration Bureau decided to migrate their in-house Exchange server to Exchange Online. After some discussions, they concluded to migrate their domain to the same tenant with Primary Mail Service. Other than that, there are more than a hundred legacy email servers inside our campus network operated by various departments as subdomains of kyushu-u.ac.jp. We are designing a plan to consolidate them into our tenant of Exchange Online to reduce a budget and human resource costs, and to improve security. In this presentation, we share our experiences about migrating our campus-wide email services to Exchange Online. We also discuss why we want to consolidate other legacy email servers and how to implement the plan..
Presentations
1. Yoshiaki Kasahara, End of Basic Authentication and Migration to Modern Authentication for Exchange Online, Proceedings of the 2023 ACM SIGUCCS Annual Conference, 2023.03, At Kyushu University, Information Infrastructure Initiative provides an email se
rvice named "Primary Mail Service" for students and staff members with Microsoft
Office 365 Exchange Online. On September 20th, 2019, Microsoft announced the en
d of support for Basic Authentication for Exchange Online, which is considered v
ulnerable to identity leakages such as phishing and malware attacks. Microsoft w
ould require users to use Modern Authentication such as Exchange protocol or OAu
th 2.0 authorization with IMAP, POP, and SMTP. Historically we had instructed ou
r users to use IMAP or POP and SMTP protocols for their email applications, incl
uding Microsoft Outlook and Mozilla Thunderbird, so disabling Basic Authenticati
on would significantly impact our user population. In September 2021, Microsoft
announced the end of September 2022 as the hard deadline for disabling Basic Aut
hentication. Based on available information, we prepared migration documents fro
m Basic Authentication to Modern Authentication and started to notify users to a
bandon Basic Authentication. Sending messages to users did not seem to be effect
ive after a couple of notifications, so we tried to temporarily disable Basic Au
thentication to realize the remaining users through authentication failures. In
this paper, we would like to share our experiences about the effect of retiring
Basic Authentication for Exchange Online on our service and users..
2. A Consideration on a Sender-Side Spam Scoring Header of E-mail Messages.
3. Yoshiaki Kasahara, Takao Shimayoshi, Our Design and Implementation of Multi-Factor Authentication Deployment for Microsoft 365 in Kyushu University, 2022 ACM SIGUCCS Annual Conference (SIGUCCS '22), 2022.04, [URL], In Kyushu University, Information Infrastructure Initiative manages a Microsoft 365 tenant for our university members. We started offering Office 365 in 2016 and migrated our university-wide email service to Microsoft 365 Exchange Online in 2018. Due to the recent outbreak of COVID-19, off-campus uses of Microsoft 365 have increased, and concerns about account security arose. We discussed how to deploy Multi-Factor Authentication (MFA) to protect our users. Microsoft 365 comes with Azure Active Directory (Azure AD), and it includes built-in MFA functionality. With the basic Azure AD MFA, individual users can register MFA information anytime but have no control to enable or disable MFA. Tenant administrators need to enable MFA for each account. For a gradual deployment, we want to allow users to enroll in MFA and register information at their convenience. In addition to that, we want to prevent malicious attackers from registering their MFA information if an account should be already compromised. Such control was difficult with the basic Azure AD MFA. Since 2020 our tenant subscribes to Azure AD Premium P2 licenses, which provides Azure AD Conditional Access. Conditional Access enables fine controls of MFA and other user access behavior with security groups. We designed an MFA self-enrolling and configuration system, and implemented it with Microsoft Forms, Power Automate, Conditional Access, and in-house web applications. By design, this system prohibits MFA information registration until user’s self-enrollment in MFA, and requests the user to register MFA information upon the next sign-in after the self-enrollment. This is supposed to reduce the possible unauthorized registration of MFA information. We extensively discussed implementation of various measures and preparation of documents to counter users’ troubles and complaints. We started deploying MFA in April 2021, but we have not yet fully mandated MFA due to a push back from some executives expressing concern about the adverse effects of enforcing MFA too quickly..
4. Takao Shimayoshi, Yoshiaki Kasahara, Naomi Fujimura, Challenge for Consolidation of Individual Email Services into a Cloud Service, ACM SIGUCCS Annual Conference (SIGUCCS '21), 2021.03, [URL], Email is a traditional but still important global communication tool. An email address is a kind of personal identifier, and email addresses printed on publications require persistent reachability. Kyushu University provides a university-wide email service, Primary Mail Service, and assigns a Primary Mail Address for each member. Divisions of the university additionally operate individual email services for their internet subdomains and administer member email addresses. Since email is a major means of cyberattacks nowadays, the secure operation of an email server demands considerable effort and high skill. This article describes a challenge at Kyushu University for consolidating individual email services. Since 2018, the Primary Mail Service has been operated using Microsoft’s cloud service, Exchange Online, which supports multiple internet domains on a tenant. The approach employed is registering divisional subdomains to the tenant and configuring forwarding addresses from addresses of the subdomains to the Primary Mail Addresses or external addresses. A desirable scheme is for each domain administrator to manage forwarding addresses of the domain, but Exchange Online is unable to delegate administration to the domains. To overcome this, a system was designed and developed for domain administrators to create, read, update, and delete forwarding addresses. Beginning in July 2020, a new service to import divisional domains was offered. We are now planning measures for promoting the consolidation of individual email services..
5. Yoshiaki Kasahara, Takao Shimayoshi, Tadayuki Miyaguchi, Naomi Fujimura, Migrate Legacy Email Services in Kyushu University to Exchange Online, 2019 ACM SIGUCCS Annual Conference, SIGUCCS 2019, 2019.11, In Kyushu University, Information Infrastructure Initiative provides an email service for students and staff members, called ``Primary Mail Service''. We had operated an on-premises system for this service, and the lifetime of this system would end in early 2019. We needed to reduce costs for replacing this system because our university had just finished a major campus migration. We compared some options such as building a yet another on-premise system and migrating to a cloud-based email service and finally gave up the on-premise option because we couldn't afford replacement and operational costs of another on-premises system anymore. We selected Microsoft Exchange Online as the new service mainly because we already had a contract with Microsoft and been operating an Office 365 tenant. We had additional requirements for user provisioning and services which were not available in Exchange Online, so we had to implement and maintain additional systems on top of it. On December 18th, 2018, we successfully migrated the email service to Exchange Online. By coincidence, Kyushu University Administration Bureau decided to migrate their in-house Exchange server to Exchange Online. After some discussions, they concluded to migrate their domain to the same tenant with Primary Mail Service. Other than that, there are more than a hundred legacy email servers inside our campus network operated by various departments as subdomains of kyushu-u.ac.jp. We are designing a plan to consolidate them into our tenant of Exchange Online to reduce a budget and human resource costs, and to improve security. In this presentation, we share our experiences about migrating our campus-wide email services to Exchange Online. We also discuss why we want to consolidate other legacy email servers and how to implement the plan..
6. Yoshiaki Kasahara, Takao Shimayoshi, Eisuke Ito, Naomi Fujimura, The past, current, and future of our email services in Kyushu University, 2018 ACM SIGUCCS Annual Conference, SIGUCCS 2018, 2018.09, In Kyushu University, Information Infrastructure Initiative provides email service for students and staff members. Email services for students and staff members were started separately. For students, an email service was started as Unix accounts of "Computer System for Education" in 1995. On the other hand, an email service for staff members was started in 2009, and eventually the two mail services were merged into the current "Kyushu University Primary Mail Service" in 2014. The designs of these mail systems were affected by various operational issues and political decisions at their times. We think that running an in-house mail system is becoming less feasible due to the initial/operational cost, security issues, and our dwindling budget. For the current system, the planned 5-year lifetime ends in this fiscal year. Therefore, we are forced to migrate to a cloud-based mail service. In this presentation, we want to share our past experiences and future plans about our university email services..
7. Yoshiaki Kasahara, Takao Shimayoshi, Masahiro Obana, Naomi Fujimura, Our experience with introducing microsoft office 365 in Kyushu University, 45th ACM Annual SIGUCCS Conference, SIGUCCS 2017, 2017.10, Information Infrastructure Initiative of Kyushu University started serving Office 365 Education for all students and staff members at Kyushu University in November 2016. Since 2007, the university had signed Microsoft EES (Enrollment for Education Solutions) including licenses for the latest Microsoft Windows and Office suite. The EES agreement includes an advantage to provide Office 365 Education to the university members with minimum investments, and there was a demand for Skype for Business which is included in Office 365. To deploy Office 365 for our users, we first needed to configure our on-premises user authentication infrastructure to coordinate with Office 365. During trials, we had a couple of difficulties attributed to some disagreements between Microsoft's and our policy on whether the user identifier, namely the user principal name in Active Directory, was open or private. Additionally, we had to consider which services should be applied to the users, because we have been operating an on-premises email service which is competing with Microsoft Exchange mail service. In this presentation, we share our experiences in Office 365 deployment..
8. Yoshiaki Kasahara, Takuya Kawatani, Eisuke Ito, Koichi Shimozono, An Analysis of Relationship between Storage Usage Distribution and Per-User Quota Value, 2016 ACM SIGUCCS Annual Conference on User Services Conference (SIGUCCS '16), 2016.11, [URL], To prevent resource (especially storage) shortage, information systems such as storage services and email services usually impose an upper bound of resource consumption (quota) per user. In a conservative way, an administrator tends to set a quota value such as the storage capacity divided by the expected maximum number of users for safety and fairness, but it tends to leave large unused storage space, because the users’ storage usage pattern shows a long-tailed distribution. In this paper, we analyzed storage usage distribution of some email services to approximate the distribution using a power-law distribution, and proposed a method to calculate an optimal quota value from a target size of storage consumption to increase storage utilization. We applied an optimal quota value we calculated to a real email service and analyzed the effect of quota change. Then, we analyzed actual distributions further to find a better model to approximate the distribution, and found that a log-normal distribution explained the distribution better than power-law. We also analyzed two other universities’ email service to find similar distribution in these systems..
9. Yoshiaki Kasahara, Eisuke Ito, Naomi Fujimura, Masahiro Obana, Introduction of Unchanging Student User ID for Intra-Institutional Information Service, 2015 ACM SIGUCCS Annual Conference on User Services Conference (SIGUCCS '15), 2015.11, [URL], In Kyushu University, a traditional "Student ID" based on student number assigned by Student Affairs Department had been used as the user ID of various IT services for a long time. There were some security and usability concerns using Student ID as a user ID. Since Student ID was used as the e-mail address of the student, it was easy to leak outside. Student ID is constructed based on a department code and a serial number, so guessing other ID strings from one ID is easy. Student ID is issued at the day of the entrance ceremony, so it is not usable for pre-entrance education. Student ID will change when the student moves to another department or proceeds from undergraduate to graduate school, so he/she loses personal data when Student ID changes. To solve these problems, Kyushu University decided to introduce another unchanging user ID independent from Student ID. This paper reports the design of new user ID, ID management system we are using, and the effect of introduction of new user ID..
10. Yoshiaki Kasahara, POODLE and related SSL vulnerabilities, Network Security Workshop in APAN 39th Meeting, 2015.03, [URL], In October 2014, Google Security Team discovered and published yet-another SSL vulnerability called POODLE (Padding Oracle On Downgraded Legacy Encryption), which allows a man-in-the-middle attacker to decipher an encrypted text without knowing the encryption key (one byte per 256 requests). It induced urged action to exterminate SSLv3 support from various services in the Internet, but it also caused troubles with some users. In this talk, Ill try to summarize what is POODLE attack, how it works, its workaround, and influence on ordinary users..
11. Yoshiaki Kasahara, Eisuke Ito, Naomi Fujimura, Introduction of New Kyushu University Primary Mail Service for Staff Members and Students, 2014 ACM SIGUCCS Annual Conference on User Services Conference (SIGUCCS '14), 2014.11, [URL], In the end of fiscal year 2013 (March 2014), Kyushu University Information Infrastructure Initiative introduced new Primary Mail Service for Staff Members and Students. The previous service for staff members had been built using proprietary mail and LDAP appliance, but tight user license and the nature of proprietary system caused several troubles. The previous service for students had been built using open source software (Postfix and Dovecot), but there were some issues with the old implementation of LDAP authentication. With these experiences, we decided to design a new system by merging both system using open source software including Postfix, Dovecot, OpenLDAP, and Squirrelmail. We also extended alias address setting service (previously available for students only) to all the members including staff members. In this paper, we explain the design and implementation, user migration, current status and future works of our new mail service..
12. Yoshiaki Kasahara, OpenSSL Heartbleed and aftermath, Network Security Workshop in APAN 38th Meeting, 2014.08, [URL], Recently revealed OpenSSL's "Heartbleed" vulnerability had shaken various parts of the Internet community abruptly. In this talk, I'll (re-)introduce some recent vulnerabilities including "Heartbleed," and some interesting events around them..
13. Yoshiaki Kasahara, DNS Amp and its mitigation, Network Security Workshop in APAN 37th Meeting, 2014.01, [URL], DNS is one of the fundamental and indispensable services in the Internet. Almost all the services rely on it. Because DNS is (basically) UDP based protocol, there are some security issues such as poisoning and amplification attack. In this talk, I'll explain DNS Amp attack and its mitigation with some experience in Kyushu University campus network..
14. Yoshiaki Kasahara, Eisuke Ito, Naomi Fujimura, Gulliver's Toss: Google's Chronic Big Load to University Mail Server and Its Sudden Resolution, 2013 ACM SIGUCCS Annual Conference on User Services Conference (SIGUCCS '13), 2013.11, [URL], Traditionally, Kyushu University has been providing email service internally using its own domain name for staff members and students of the university. Around January 2012, we noticed that the high load of the university authentication server, and we realized that one of causes was the access from the mail server for students (called Student Primary Mail Service). Detailed analysis showed that there was chronic big load produced by Gmail's Mail Fetcher, especially toward nonexistent accounts removed due to graduation. In this paper, we explain the situation and reasons of the big load induced by Google, its possible countermeasures, and its sudden resolution by Google's silent change..
15. Yoshiaki Kasahara, Eisuke Ito, A Study of Network Issues for Implementing Large-scale Academic Cloud Service, IEICE Workshop on Internet Architecture 2013 (IA2013), 2013.10, The virtualization technology of computer resources has matured enough for production services, and cloud services became popular in various fields. Cloud services are also gradually incorporated in universities' research and education activities. There is a demand for cloud infrastructure suitable for academic activities. To implement practical and user-friendly services on private, community, or public cloud services, we need to consider about network design. This paper tries to clarify network issues for implementing cloud services considering use cases, the number of instances, utilization of IP addresses, virtual private network, client access networks, and so on..
16. Yoshiaki Kasahara, Yasuichi Kitamura, APAN CIF Server Update, Network Security Workshop in APAN 36th Meeting, 2013.08, From 2012, APAN Security WG is working with REN-ISAC (Research and Education Networking Information Sharing and Analysis Center) for a test pilot of federated sharing of security intelligence information over Collective Intelligence Framework (CIF) developed by REN-ISAC. Until recently we were running CIFv0, but due to underlying OS upgrade/reinstall, now we need to migrate to CIFv1, which is still in testing stage. In this talk, we will introduce the current status of APAN CIF server and its software upgrade experience..
17. Kevin Benton, Gabriel Iovino, Yoshiaki Kasahara, Yasuichi Kitamura, International Collaboration for Security Event Information Sharing, Tech in Paradise 2013, 2013.01, [URL], At the Summer 2009 JointTechs, the REN-ISAC Security Event System (SES) was introduced. SES provides for collection of security event data from participating institutions, data correlation, and output of threat indicators. Participants use the indicators in local protections, such as IDS and sinkholes, and in incident analysis. SES is a production tool serving the REN-ISAC community.

SES continues to evolve, as the Collective Intelligence Framework (CIF), receiving National Science Foundation support. CIF provides additional capabilities, including a broader base of data from public, private, and participant sources, additional data types, scaling, improved API, and inter-federated sharing. Core indicator sharing occurs within a multi-institutional trust community, such as within the community of REN-ISAC members. In CIF inter-federated, data collected in one trust community can be exchanged, through policy, with other communities. Among TransPAC3 project deliverables, linking APAN and US networks, is to engage the respective communities to address security threats and incidents. In that context, US and APAN researchers established pilot inter-federation sharing of security event information among CIF systems, one operated by REN-ISAC at Indiana University, and another by researchers at Kyushu University and APAN-JP. This presentation provides background on CIF, and details the APAN-US international security information sharing pilot..
18. Yoshiaki Kasahara, Yasuichi Kitamura, Toward federated sharing of security intelligence information over Collective Intelligence Framework (CIF), Network Security Workshop in APAN 34th Meeting, 2012.08, [URL], REN-ISAC (Research and Education Networking Information Sharing nd Analysis Center - http://www.ren-isac.net/) has been working for SES (Security Event System) Project. CIF (Collective Intelligence Framework) is a framework developed through the project as an open source tool/framework to collect intelligence concerning malicious actors and reputation of Internet elements. As SESv3, they started to explore inter-federation information sharing, and APAN Security WG is involved as one of counterparts. In this talk, I'll (re)introduce CIF, explain the current status of the cooperation, and call for more participants from APAN community..
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Membership in Academic Society
  • Information Processing Society of Japan
  • The Institute of Electronics, Information and Communication Engineers