過去文獻指出資安攻擊事件(cyberattacks)會影響公司的公司治理以及現金流量的波動度；而上述兩者亦在先前相關研究中被證實與公司財報可比性(financial statement comparability)有顯著的相關性。因此本研究即針對資安攻擊與財報可比性兩者之間的關聯性進行探討分析，並檢視兩者間的傳導機制。
本文利用2005年至2018年美國資安攻擊事件之資料，進行資安攻擊與財務報表可比性之關聯性探討。我們採用財報可比性的代理變數與資安事件的指標變數進行分析，並考慮相關控制變數對財報可比性的影響。實證結果顯示，資安攻擊與財報可比性的存在顯著的正向關聯，支持公司傾向透過公司治理的改善來加強財報可比性的假說。此外，兩者之間的關聯性在機構投資人持股比率較低、分析師盈餘預測離散度較低、以及媒體曝光度較高的公司中將表現更為強烈。

Previous studies have shown that cyberattacks tend to affect firms’ corporate governance and cash flow volatility, both of which are also found to be highly associated with financial statement comparability. Thus, in the paper we aim to prove the direct relations between cyberattacks and financial statement comparability and further verify its underlying mechanism.
Using the samples of cyberattack events in the United States during the period from 2005 to 2018, we investigate the relations between cyberattacks and financial statement comparability. Proxy variables for financial statement comparability, indicator variables for cyberattacks, and related control variables are used in empirical analysis. The results reveals that there’s positive relation between cyberattacks and financial statement comparability. Furthermore, this relation is more pronounced for firms with lower institutional ownership, lower analysts forecast dispersion, and higher media attention.

﹝1﹞ Amankwah-Amoah, J., Khan, Z., Wood, G., and Knight, G. (2021). COVID-19 and digitalization: The great acceleration. Journal of Business Research, 136, 602-611.
﹝2﹞ Behn, B. K., Choi, J. H., & Kang, T. (2008). Audit quality and properties of analyst earnings forecasts. The Accounting Review, 83(2), 327-349.
﹝3﹞ Brochet, F., Jagolinzer, A. D., and Riedl, E. J. (2013). Mandatory IFRS adoption and financial statement comparability. Contemporary Accounting Research, 30(4), 1373-1400.
﹝4﹞ Bushee, B. J. (1998). The influence of institutional investors on myopic R&D investment behavior. Accounting Review, 305-333.
﹝5﹞ Chung, K. H., & Zhang, H. (2011). Corporate governance and institutional ownership. Journal of Financial and Quantitative Analysis, 46(1), 247-273.
﹝6﹞ De Franco, G., Kothari, S. P., and Verdi, R. S. (2011). The benefits of financial statement comparability. Journal of Accounting Research, 49(4), 895-931.
﹝7﹞ Dhaliwal, D., Judd, J. S., Serfling, M., and Shaikh, S. (2016). Customer concentration risk and the cost of equity capital. Journal of Accounting and Economics, 61(1), 23-48.
﹝8﹞ Dhole, S., Liu, L., Lobo, G. J., and Mishra, S. (2021). Economic policy uncertainty and financial statement comparability. Journal of Accounting and Public Policy, 40(1), 106800.
﹝9﹞ Dhole, S., Lobo, G. J., Mishra, S., & Pal, A. M. (2015). Effects of the SEC's XBRL mandate on financial reporting comparability. International Journal of Accounting Information Systems, 19, 29-44.
﹝10﹞ Dyck, A., & Zingales, L. (2002). The corporate governance role of the media. In: National Bureau of Economic Research Cambridge, Mass., USA.
﹝11﹞ Elyasiani, E., Wen, Y., and Zhang, R. (2017). Institutional ownership and earning management by bank holding companies. Journal of Financial Research, 40(2), 147-178.
﹝12﹞ Feng, M., Li, C., McVay, S. E., and Skaife, H. (2015). Does ineffective internal control over financial reporting affect a firm's operations? Evidence from firms' inventory management. Accounting Review, 90(2), 529-557.
﹝13﹞ Francis, J. R., Pinnuck, M. L., and Watanabe, O. (2014). Auditor style and financial statement comparability. Accounting Review, 89(2), 605-633.
﹝14﹞ Garg, P. (2020). Cybersecurity breaches and cash holdings: Spillover effect. Financial Management, 49(2), 503-519.
﹝15﹞ Gatzlaff, K. M., and McCullough, K. A. (2010). The effect of data breaches on shareholder wealth. Risk Management and Insurance Review, 13(1), 61-83.
﹝16﹞ GOH, B. W. (2009). Audit Committees, Boards of Directors and Remediation of Material Weaknesses in Internal Control. Contemporary Accounting Research, 26(2), 549.
﹝17﹞ Gordon, L. A., and Loeb, M. P. (2002). The economics of information security investment. ACM Transactions on Information and System Security (TISSEC), 5(4), 438-457.
﹝18﹞ Gwebu, K. L., Wang, J., and Xie, W. (2014). Understanding the cost associated with data security breaches. The Pacific Asia Conference on Information Systems.
﹝19﹞ Healy, P. M., and Wahlen, J. M. (1999). A review of the earnings management literature and its implications for standard setting. Accounting Horizons, 13(4), 365-383.
﹝20﹞ Heninger, W. G., Johnson, E. N., and Kuhn, J. R. (2018). The association between IT material weaknesses and earnings management. Journal of Information Systems, 32(3), 53-64.
﹝21﹞ Herrmann, D., and Thomas, W. B. (2005). Rounding of analyst forecasts. Accounting Review, 80(3), 805-823.
﹝22﹞ Huang, H. H., and Wang, C. (2021). Do Banks Price Firms' Data Breaches? Accounting Review, 96(3), 261-286.
﹝23﹞ Imhoff Jr, E. A., & Lobo, G. J. (1992). The effect of ex ante earnings uncertainty on earnings response coefficients. Accounting Review, 427-439.
﹝24﹞ Imhof, M. J., Seavey, S. E., and Smith, D. B. (2017). Comparability and cost of equity capital. Accounting Horizons, 31(2), 125-138.
﹝25﹞ Janakiraman, R., Lim, J. H., and Rishika, R. (2018). The effect of a data breach announcement on customer behavior: Evidence from a multichannel retailer. Journal of Marketing, 82(2), 85-105.
﹝26﹞ Yang, S., Liu, F. C., & Zhu, X. (2018). The impact of XBRL on financial statement structural comparability. In Network, Smart and Open (pp. 193-206). Springer, Cham.
﹝27﹞ Joe, J. R., Louis, H., & Robinson, D. (2009). Managers’ and investors’ responses to media exposure of board ineffectiveness. Journal of Financial and Quantitative Analysis, 44(3), 579-605.
﹝28﹞ Kamiya, S., Kang, J.-K., Kim, J., Milidonis, A., and Stulz, R. M. (2021). Risk management, firm reputation, and the impact of successful cyberattacks on target firms. Journal of Financial Economics, 139(3), 719-749.
﹝29﹞ Kim, J.-B., Li, L., Lu, L. Y., and Yu, Y. (2016). Financial statement comparability and expected crash risk. Journal of Accounting and Economics, 61(2-3), 294-312.
﹝30﹞ Kim, J.-B., Song, B. Y., and Stratopoulos, T. C. (2018). Does information technology reputation affect bank loan terms? Accounting Review, 93(3), 185-211.
﹝31﹞ Kim, S., Kraft, P., and Ryan, S. G. (2013). Financial statement comparability and credit risk. Review of Accounting Studies, 18(3), 783-823.
﹝32﹞ Kinney Jr, W. R. (2000). Research opportunities in internal control quality and quality assurance. Auditing, 19, 83.
﹝33﹞ Klamm, B. K., and Watson, M. W. (2009). SOX 404 reported internal control weaknesses: A test of COSO framework components and information technology. Journal of Information Systems, 23(2), 1-23.
﹝34﹞ Lallie, H. S., Shepherd, L. A., Nurse, J. R., Erola, A., Epiphaniou, G., Maple, C., and Bellekens, X. (2021). Cyber security in the age of covid-19: A timeline and analysis of cyber-crime and cyber-attacks during the pandemic. Computers and Security, 105, 102248.
﹝35﹞ Lawrence, A., Minutti-Meza, M., and Vyas, D. (2018). Is operational control risk informative of financial reporting deficiencies? Auditing: A Journal of Practice and Theory, 37(1), 139-165.
﹝36﹞ Lending, C., Minnick, K., and Schorno, P. J. (2018). Corporate governance, social responsibility, and data breaches. Financial Review, 53(2), 413-455.
﹝37﹞ Liu, L. Y., & Peng, E. Y. (2006). Institutional ownership composition and accruals quality. Working Paper, Available at SSRN 929582.
﹝38﹞ McCrank, J., and Finkle, J. (2018). Equifax breach could be most costly in corporate history. Reuters.
﹝39﹞ Morse, E. A., Raval, V., and Wingender Jr, J. R. (2011). Market price effects of data security breaches. Information Security Journal: A Global Perspective, 20(6), 263-273.
﹝40﹞ Ponemon, L. (2017). Cost of data breach study. Ponemon Institute.
﹝41﹞ Robert, B., and Lajtha, C. (2002). A new approach to crisis management. Journal of Contingencies and Crisis Management, 10(4), 181-191.
﹝42﹞ Sen, R., and Borle, S. (2015). Estimating the contextual risk of data breach: An empirical approach. Journal of Management Information Systems, 32(2), 314-341.
﹝43﹞ Sohn, B. C. (2016). The effect of accounting comparability on the accrual-based and real earnings management. Journal of Accounting and Public Policy, 35(5), 513-539.
﹝44﹞ Xie, B., Davidson III, W. N., and DaDalt, P. J. (2003). Earnings management and corporate governance: the role of the board and the audit committee. Journal of Corporate Finance, 9(3), 295-316.
﹝45﹞ Xu, H., Guo, S., Haislip, J. Z., and Pinsker, R. E. (2019). Earnings management in firms with data security breaches. Journal of Information Systems, 33(3), 267-284.