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移り変わるEメール上のやり取り:Eメールセキュリティは過去から抜け出せない

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29
Mar 2023
29
Mar 2023
As attackers move from low sophistication, spray-and-pray campaigns to more targeted and sophisticated attacks, email security needs to understand the organization, not past attacks, to be able to keep up with attacker innovation and stop novel attacks on the first time of asking.

Eメールを主なターゲットとする脅威が拡大する中、ITチームは、十分なスピードで進化していない従来のEメールセキュリティの手法をはるかに超えることが必要です。過去の攻撃データに基づいて訓練されているため、以前に見たことのあるものしか検知できないのです。 

フィッシング攻撃は、攻撃者が配信戦術とソーシャルエンジニアリングという2つの重要な領域で革新を遂げるにつれて、より標的を絞り、洗練されてきています。マルウェアの配信面では、SharePointやOneDriveなどのサービスや、正規のメールアカウントなどの正規のインフラや評判を利用して、セキュリティツールを回避する攻撃者が増えてきています。

攻撃者は、Eメールの向こう側にいる人間から逃れるために、新しいソーシャルエンジニアリングの戦術を駆使し、これまでと同様に恐怖、不確実性、疑念(FUD)を悪用することで緊急性を喚起しています。

ChatGPTのようなツールの助けを借りて、脅威アクターはAI技術を活用し、信頼できる組織や連絡先になりすますことができます。具体的には、ビジネスメールの侵害、現実的なスピアフィッシング、スプーフィング、ソーシャルエンジニアリングなどの損害を与えることができます。実際、DarktraceはChatGPTのリリース以降、フィッシングメールの平均的な言語的複雑さが17%も跳ね上がったことを検知しています。

これは、攻撃の高度化が加速し、攻撃者の参入障壁が低くなり、攻撃結果が改善された一例です。これは、攻撃環境が、洗練度が低く、インパクトが小さい、一般的なフィッシング戦術(「スプレー&プレー」アプローチ)から、ルールやシグネチャに依存するあらゆるツールの典型的な検知範囲から外れる、より標的を絞った、洗練され、インパクトの大きい攻撃へと移行するという、より広いトレンドの一部を形成しています。攻撃者のツールキットに含まれる生成AIやその他のテクノロジーによって、こうした攻撃を大規模に行うことが可能になり、以前から見られていた既知の脅威を捕らえるだけでは、もはや十分ではなくなります。

図1:攻撃の進行とメールセキュリティツールの相対的な適用範囲の推移

Eメールを主なターゲットとする脅威が拡大する中、大半のEメールセキュリティツールは十分な進化を遂げていません。また、過去の攻撃データから次の攻撃を予測し、今日の攻撃を明日につなげるように設計されています。

組織ではAIシステムへの移行が進んでいますが、すべてのAIが同じというわけではなく、そのAIの応用が重要です。ITおよびセキュリティチームは、コンテキストを認識し、AIを活用して深い行動分析を行うメールセキュリティに移行する必要があります。これは、何千もの組織で、他のツールをすり抜ける攻撃を見事にキャッチしてきた、実績のあるアプローチです。また、今日のEメールセキュリティは、受信トレイを保護するだけではありません。悪意のあるメールだけでなく、メールメッセージやアカウントなど、ユーザーの全方位的な視点、さらにメールがコラボレーションツールやSaaSに侵入するような範囲にも対応する必要があるのです。多くの企業にとって、問題はメールセキュリティをアップグレードすべきかどうかではなく、いつアップグレードするか、つまり、過去にとらわれたメールセキュリティにいつまで頼ることができるのかということです。

メールセキュリティ業界はいたちごっこの世界

ゲートウェイやICES(Integrated Cloud Email Security)プロバイダーには、未来を予測するために過去の攻撃に目を向けるという共通点があります。これらのツールは、過去の脅威インテリジェンスや、すでに悪意があると判断されたメールの既知の悪い要素を集めた「拒否リスト」に頼ることが多く、現代の脅威状況の現実に対応できていないのです。これらのツールの中には、AIを使用してこの欠陥のあるアプローチを改善しようとするものもあり、直接一致するものを探すだけでなく、「データ拡張」を使用して類似したメールを見つけようとします。しかし、このアプローチでは、本質的に新しい脅威が見えないことに変わりはありません。

このようなツールは、リソースを過剰に必要とする傾向があり、常にポリシーを維持し、保持されている正当なメールを解放し、悪意のあるフィッシングメールを阻止するための手作業が必要となります。個々のEメールを手動で解除するこの負担は、通常、セキュリティチームに課せられますが、このチームは小規模で複数の担当領域を持つことが多いのです。解決策としては、悪質なメールを自律的に阻止 し、正規のメールを通過させ、組織の変化に適応するテクノロジー、つまり「セット&フォーゲット」という定義に実際に適合するテクノロジーを導入することです。

挙動と文脈を意識する  

業界では、「安全な」メールゲートウェイから、AIを活用したインテリジェントな思考への激変が進行中です。正しいアプローチは、エンドユーザーの行動を理解すること、つまり、各人が受信トレイをどのように使っているか、各ユーザーにとって何が「普通」であるかを理解することで、普通でないことを検知することです。また、いつ、どのように、誰と、どのようにコミュニケーションしているかというコンテキストを利用して、異常な点を発見し、何かおかしいと思ったら、その理由とともにユーザーに警告を発します。基本的には、(過去の攻撃ではなく)あなたを理解するためのシステムです。  

Darktrace は、過去のデータから危険なものを学習するのではなく、各組織とそのユーザーを深く継続的に理解することで、根本的に異なるアプローチのAIを開発しました。各従業員の通常の日々の行動を複雑に理解してこそ、メールが実際にその受信者の受信箱に属するかどうかを正確に判断することができるのです。 

フィッシング、ランサムウェア、請求書詐欺、役員なりすまし、あるいはもっと斬新な手法であっても、行動分析にAIを活用することでより迅速な意思決定が可能になります。悪質な脅威を初見で阻止できるため、新しい攻撃を封じるためにゼロ号患者を待つ必要がありません。検知の信頼性が高まることで、より的確な対応、つまり、警戒心から広範な包括的対応を行うのではなく、メールの最も危険な部分のみを削除する標的型対応を行うことができ、ビジネスの混乱を最小限に抑えながらリスクを低減することができます。

攻撃スペクトルに話を戻すと、マルウェアの配布や被害者の誘導に、斬新な、あるいは一見正当なインフラを使用する高度に洗練された攻撃への移行がますます進んでおり、こうしたインパクトの強い標的型攻撃を検知して適切な対応を行うことがかつてなく重要になってきています。 


図2:Darktrace をネイティブのEメールセキュリティと組み合わせることで、あらゆる攻撃をカバー可能

お客様を理解し、エンドユーザーを全方位で見渡す  

現代のEメールセキュリティは、受信箱だけに限定されるものではなく、Eメールやそれ以外の場所でのユーザーの通常の行動を完全に理解する必要があることを私たちは知っています。従来のEメールツールは、侵入のポイントとしてインバウンドメールにのみ焦点を当てており、アカウントが侵害された後、Eメール攻撃の成功によって引き起こされる潜在的に壊滅的なダメージから保護することができません。    

図3:ユーザーを360° 理解することで、Microsoft以外のデジタルタッチポイントが見えてくる


Microsoft 365、Google Workspace、Salesforce、Dropbox、そしてネットワーク上のデバイスでのユーザーの行動を把握することは、そのユーザーにとって何が正常であるかを完全に把握するために極めて重要です。デバイス(および受信箱)の感染症状を監視することは、悪意のあるメールかどうかを判断し、今後同様のメールを送信しないようにする必要があるかどうかを判断するために非常に重要です。クラウドアプリのデータと組み合わせることで、IDベースの攻撃をより全体的に把握することができます。

また、メールセキュリティと攻撃対象の外部データを結びつけることで、悪意のあるドメインをプロアクティブに発見し、攻撃が開始される前に防御を強化することができます。

従業員への教育および啓蒙活動

最終的に、Eメールに接するのは従業員です。このようなユーザーをうまく活用することができれば、よりスマートな従業員、より少ない攻撃回数、そしてより戦略的な業務に時間を割くことができるセキュリティチームを手に入れることができるのです。 

最も成功するツールは、AIを活用して従業員のセキュリティ意識を向上させることができるものでしょう。明らかに悪意があり、従業員の受信トレイに決して入ってはいけないメールもありますが、潜在的に危険な要素を持つメールには、かなりのグレーゾーンが存在します。大半のセキュリティツールは、これらのメールを、たとえビジネスクリティカルなものであったとしても、完全に受信を拒否するか、あるいは無傷で通過させるかのどちらかです。しかし、このようなグレーゾーンのメールが、実はトレーニングの機会として活用できるとしたらどうでしょうか。    

フィッシングシミュレーションベンダーとは対照的に、行動AIは、ユーザーの受信トレイを通じて軽いタッチでトレーニングを行うことで、組織全体のセキュリティ意識を総合的に向上させることができ、エンドユーザーを防御強化の輪に引き込むことができます。  

メールセキュリティの新境地は、AIとAIとの戦いであり、遅れをとった組織は、つらい思いをすることになるかもしれません。これらのテクノロジーは、従業員の体験をどのように変え、展開をダイナミックにし、セキュリティチームを増強し、統合された防御ループの一部を形成することができるかについて、Darktraceのブログシリーズをお読みください。    

[1] 複数のアクティブなフィッシングペイロードに対するDarktrace/Emailのレスポンスと、他のメールセキュリティ技術が提示した16の独立したフィードのうち最も早いものとの間に生じた検知期間の差の平均

INSIDE THE SOC
Darktrace cyber analysts are world-class experts in threat intelligence, threat hunting and incident response, and provide 24/7 SOC support to thousands of Darktrace customers around the globe. Inside the SOC is exclusively authored by these experts, providing analysis of cyber incidents and threat trends, based on real-world experience in the field.
AUTHOR
ABOUT ThE AUTHOR
Dan Fein
VP, Product

Based in New York, Dan joined Darktrace’s technical team in 2015, helping customers quickly achieve a complete and granular understanding of Darktrace’s product suite. Dan has a particular focus on Darktrace/Email, ensuring that it is effectively deployed in complex digital environments, and works closely with the development, marketing, sales, and technical teams. Dan holds a Bachelor’s degree in Computer Science from New York University.

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Eメール

Looking Beyond Secure Email Gateways with the Latest Innovations to Darktrace/Email

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09
Apr 2024

Organizations Should Demand More from their Email Security

In response to a more intricate threat landscape, organizations should view email security as a critical component of their defense-in-depth strategy, rather than defending the inbox alone with a traditional Secure Email Gateway (SEG). Organizations need more than a traditional gateway – that doubles, instead of replaces, the capabilities provided by native security vendor – and require an equally granular degree of analysis across all messaging, including inbound, outbound, and lateral mail, plus Teams messages.  

Darktrace/Email is the industry’s most advanced cloud email security, powered by Self-Learning AI. It combines AI techniques to exceed the accuracy and efficiency of leading security solutions, and is the only security built to elevate, not duplicate, native email security.  

With its largest update ever, Darktrace/Email introduces the following innovations, finally allowing security teams to look beyond secure email gateways with autonomous AI:

  • AI-augmented data loss prevention to stop the entire spectrum of outbound mail threats
  • an easy way to deploy DMARC quickly with AI
  • major enhancements to streamline SOC workflows and increase the detection of sophisticated phishing links
  • expansion of Darktrace’s leading AI prevention to lateral mail, account compromise and Microsoft Teams

What’s New with Darktrace/Email  

Data Loss Prevention  

Block the entire spectrum of outbound mail threats with advanced data loss prevention that builds on tags in native email to stop unknown, accidental, and malicious data loss

Darktrace understands normal at individual user, group and organization level with a proven AI that detects abnormal user behavior and dynamic content changes. Using this understanding, Darktrace/Email actions outbound emails to stop unknown, accidental and malicious data loss.  

Traditional DLP solutions only take into account classified data, which relies on the manual input of labelling each data piece, or creating rules to catch pattern matches that try to stop data of certain types leaving the organization. But in today’s world of constantly changing data, regular expression and fingerprinting detection are no longer enough.

  • Human error – Because it understands normal for every user, Darktrace/Email can recognize cases of misdirected emails. Even if the data is correctly labelled or insensitive, Darktrace recognizes when the context in which it is being sent could be a case of data loss and warns the user.  
  • Unclassified data – Whereas traditional DLP solutions can only take action on classified data, Darktrace analyzes the range of data that is either pending labels or can’t be labeled with typical capabilities due to its understanding of the content and context of every email.  
  • Insider threat – If a malicious actor has compromised an account, data exfiltration may still be attempted on encrypted, intellectual property, or other forms of unlabelled data to avoid detection. Darktrace analyses user behaviour to catch cases of unusual data exfiltration from individual accounts.

And classification efforts already in place aren’t wasted – Darktrace/Email extends Microsoft Purview policies and sensitivity labels to avoid duplicate workflows for the security team, combining the best of both approaches to ensure organizations maintain control and visibility over their data.

End User and Security Workflows

Achieve more than 60% improvement in the quality of end-user phishing reports and detection of sophisticated malicious weblinks1

Darktrace/Email improves end-user reporting from the ground up to save security team resource. Employees will always be on the front line of email security – while other solutions assume that end-user reporting is automatically of poor quality, Darktrace prioritizes improving users’ security awareness to increase the quality of end-user reporting from day one.  

Users are empowered to assess and report suspicious activity with contextual banners and Cyber AI Analyst generated narratives for potentially suspicious emails, resulting in 60% fewer benign emails reported.  

Out of the higher-quality emails that end up being reported, the next step is to reduce the amount of emails that reach the SOC. Darktrace/Email’s Mailbox Security Assistant automates their triage with secondary analysis combining additional behavioral signals – using x20 more metrics than previously – with advanced link analysis to detect 70% more sophisticated malicious phishing links.2 This directly alleviates the burden of manual triage for security analysts.

For the emails that are received by the SOC, Darktrace/Email uses automation to reduce time spent investigating per incident. With live inbox view, security teams gain access to a centralized platform that combines intuitive search capabilities, Cyber AI Analyst reports, and mobile application access. Analysts can take remediation actions from within Darktrace/Email, eliminating console hopping and accelerating incident response.

Darktrace takes a user-focused and business-centric approach to email security, in contrast to the attack-centric rules and signatures approach of secure email gateways

Microsoft Teams

Detect threats within your Teams environment such as account compromise, phishing, malware and data loss

Around 83% of Fortune 500 companies rely on Microsoft Office products and services, particularly Teams and SharePoint.3

Darktrace now leverages the same behavioral AI techniques for Microsoft customers across 365 and Teams, allowing organizations to detect threats and signals of account compromise within their Teams environment including social engineering, malware and data loss.  

The primary use case for Microsoft Teams protection is as a potential entry vector. While messaging has traditionally been internal only, as organizations open up it is becoming an entry vector which needs to be treated with the same level of caution as email. That’s why we’re bringing our proven AI approach to Microsoft Teams, that understands the user behind the message.  

Anomalous messaging behavior is also a highly relevant indicator of whether a user has been compromised. Unlike other solutions that analyze Microsoft Teams content which focus on payloads, Darktrace goes beyond basic link and sandbox analysis and looks at actual user behavior from both a content and context perspective. This linguistic understanding isn’t bound by the requirement to match a signature to a malicious payload, rather it looks at the context in which the message has been delivered. From this analysis, Darktrace can spot the early symptoms of account compromise such as early-stage social engineering before a payload is delivered.

Lateral Mail Analysis

Detect and respond to internal mailflow with multi-layered AI to prevent account takeover, lateral phishing and data leaks

The industry’s most robust account takeover protection now prevents lateral mail account compromise. Darktrace has always looked at internal mail to inform inbound and outbound decisions, but will now elevate suspicious lateral mail behaviour using the same AI techniques for inbound, outbound and Teams analysis.

Darktrace integrates signals from across the entire mailflow and communication patterns to determine symptoms of account compromise, now including lateral mailflow

Unlike other solutions which only analyze payloads, Darktrace analyzes a whole range of signals to catch lateral movement before a payload is delivered. Contributing yet another layer to the AI behavioral profile for each user, security teams can now use signals from lateral mail to spot the early symptoms of account takeover and take autonomous actions to prevent further compromise.

DMARC

Gain in-depth visibility and control of 3rd parties using your domain with an industry-first AI-assisted DMARC

Darktrace has created the easiest path to brand protection and compliance with the new Darktrace/DMARC. This new capability continuously stops spoofing and phishing from the enterprise domain, while automatically enhancing email security and reducing the attack surface.

Darktrace/DMARC helps to upskill businesses by providing step by step guidance and automated record suggestions provide a clear, efficient road to enforcement. It allows organizations to quickly achieve compliance with requirements from Google, Yahoo, and others, to ensure that their emails are reaching mailboxes.  

Meanwhile, Darktrace/DMARC helps to reduce the overall attack surface by providing visibility over shadow-IT and third-party vendors sending on behalf of an organization’s brand, while informing recipients when emails from their domains are sent from un-authenticated DMARC source.

Darktrace/DMARC integrates with the wider Darktrace product platform, sharing insights to help further secure your business across Email Attack Path and Attack Surface management.

結論

To learn more about the new innovations to Darktrace/Email download the solution brief here.

All of the new updates to Darktrace/Email sit within the new Darktrace ActiveAI Security Platform, creating a feedback loop between email security and the rest of the digital estate for better protection. Click to read more about the Darktrace ActiveAI Security Platform or to hear about the latest innovations to Darktrace/OT, the most comprehensive prevention, detection, and response solution purpose built for critical infrastructures.  

Learn about the intersection of cyber and AI by downloading the State of AI Cyber Security 2024 report to discover global findings that may surprise you, insights from security leaders, and recommendations for addressing today’s top challenges that you may face, too.

参考文献

[1] Internal Darktrace Research

[2] Internal Darktrace Research

[3] Essential Microsoft Office Statistics in 2024

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Carlos Gray
Product Manager

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Managing Risk Beyond CVE Scores With the Latest Innovations to Darktrace/OT

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09
Apr 2024

Identifying Cyber Risk in Industrial Organizations

Compromised OT devices in ICS and SCADA environments pose significant physical risks, even endangering lives. However, identifying CVEs in the multitude of complex OT devices is labor-intensive and time-consuming, draining valuable resources.

Even after identifying a vulnerability, implementing a patch presents its own challenges limited maintenance windows and the need for uninterrupted operations strain IT and OT teams often leading organizations to prioritize availability over security leading vulnerabilities remaining unresolved for over 5 years on average. (1)

Darktrace’s New Innovation

Darktrace is an industry leader in cybersecurity with 10+ years of experience securing OT environments where we take a fundamentally different approach using Self-Learning AI to enhance threat detection and response.

Continuing to combat the expanding threat landscape, Darktrace is excited to announce new capabilities that enable a contextualized and proactive approach to managing cyber risk at industrial organizations.

Today we launch an innovation to our OT Cybersecurity solution, Darktrace/OT, that will add a layer of proactivity, enabling a comprehensive approach to risk management. This industry leading innovation for Darktrace/OT moves beyond CVE scores to redefine vulnerability management for critical infrastructure, tackling the full breadth of risks not limited by traditional controls.  

Darktrace/OT is the only OT security solution with comprehensive Risk Management which includes:

  • Contextualized risk analysis unique to your organization
  • The most realistic evaluation and prioritization of OT risk
  • Effectively mitigate risk across your OT infrastructure, with and without patching.
  • The only OT security solution that evaluates your defenses against Advanced Persistent Threat (APT) Groups.

The most comprehensive prevention, detection, and response solution purpose built for Critical Infrastructures

Darktrace’s Self-Learning AI technology is a cutting-edge innovation that implements real time prevention, detection, response, and recovery for operational technologies and enables a fundamental shift from the traditional approach to cyber defense by learning a ‘pattern of life’ for every network, device, and user.  

Rather than relying on knowledge of past attacks, AI technology learns what is ‘normal’ for its environment, discovering previously unknown threats by detecting subtle shifts in behavior. Through identifying these unexpected anomalies, security teams can investigate novel attacks, discover blind spots, have live time visibility across all their physical and digital assets, and reduce time to detect, respond to, and triage security events.  

  • Achieve greater visibility of OT and IT devices across all levels of the Purdue Model.
  • The industry's only OT security to scale threat detection and response, with a 92% time saving from triage to recovery.  
  • The only OT focused security solution to provide bespoke Risk Management.

To learn more about how Darktrace/OT approaches unique use cases for industrial organizations visit the Darktrace/OT Webpage or join us LIVE at a city near you.

Read more below to discover how new innovations to Darktrace/OT are bringing a new, contextualized approach to Risk Management for Industrial organizations.

For more information on the entire Darktrace/OT Solution read our solution brief here.

Darktrace/OT and New Risk Management

Risk Identification

Leveraging the visibility of Darktrace/OT which identifies individual systems throughout the Purdue Model and the relationship between them, Darktrace/OT identifies high-risk CVEs and presents potential attack routes that go beyond techniques requiring a known exploit, such as misuse of legitimate services. Each attack path will have a mathematical evaluation of difficulty and impact from initial access to the high value objectives.  

Together this gives comprehensive coverage over your real and potential risks from both an attacker and known vulnerability perspectives. OT attack paths as seen here even leverage insights between the industrial and corporate communications to reveal ways threat actors may take advantage of IT-OT convergence. This revelation of imperceptible risks fills gaps in traditional risk analysis like remote access and insider threats.

Figure 1: Darktrace/OT visualizing the most critical attack paths at an organization
Figure 1: Darktrace/OT visualizing the most critical attack paths at an organization
Figure 2: A specific Attack Path identified by Darktrace/OT

Risk Prioritization

Darktrace/OT prioritizes remediations and mitigations based on difficulty and damage to your unique organization, using the established Attack Paths.

We ascertain the priorities that apply to your organization beyond pure theoretical damage answering questions like:

  • How difficult is a particular vulnerability to exploit considering the steps an attacker would require to reach it?
  • And, how significant would the impact be if it was exploited within this particular network?

This expanded approach to risk prioritization has a much more comprehensive evaluation of your organization's unique risk than has ever been possible before. Traditional approaches of ranking only known vulnerabilities with isolated scores using CVSS and exploitability metrics, often leaves gaps in IT-OT risks and is blind to legitimate service exploitation.

Figure 3: Darktrace/OT leverages its contextual understand of the organization’s network to prioritize remediation that will have the positive impact on the risk score

Darktrace provides mitigation strategies associated with each identified risk and the relevant impact it has on your overall risk posture, across all MITRE ATT&CK techniques.

What sets Darktrace apart is our ability to contextualize these mitigations within the broader business. When patching vulnerabilities directly isn’t possible, Darktrace identifies alternative actions that harden attack paths leading to critical assets. Hardening the surrounding attack path increases the difficulty and therefore reduces the likelihood and impact of a breach.

That means unpatched vulnerabilities and vulnerable devices aren’t left unprotected. This also has an added bonus, those hardening techniques work for all devices in that network segment, so apply one change, secure many.

Figure 4: Darktrace prioritizes mitigation reducing accessibility of vulnerability and the overall risk score when patches aren’t available

Communicate Board Level Risk with APT Threat Mapping

Darktrace/OT bridges theory and practice as the only security solution that maps MITRE techniques, frequently used by APT Groups, onto AI-assessed critical Attack Paths. This unique solution provides unparalleled insights including sector and location intelligence, possible operating platforms, common techniques, exploited CVEs, and the number of potential devices affected in your environment, supporting holistic risk assessment and proactive defense measures.

Ultimately, this becomes a power dashboard to communicate board level risk, using both metric based evidence and industry standard threat mapping.

結論

Darktrace/OT is part of the Darktrace ActiveAI Security Platform a native, holistic, AI-driven platform built on over ten years of AI research. It helps security teams shift to more a productive mode, finding the known and the unknown attacks and transforming the SOC with the various Darktrace products to drive efficiency gains. It does this across the whole incident lifecycle to lower risk, reduce time spent on active incidents, and drive return on investment.

Discover more about Darktrace's ever-strengthening platform with the upcoming changes coming to our Darktrace/Email product and other launch day blogs.

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参考文献

1. https://research-information.bris.ac.uk/ws/portalfiles/portal/313646831/Catch_Me_if_You_Can.pdf

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著者について
Mitchell Bezzina
VP, Product and Solutions Marketing
Our ai. Your data.

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