A security analyst at a retail bank has discovered a series of unauthorized transactions that resulted in funds being siphoned from multiple accounts. Upon further investigation, the analyst found evidence that the digital signatures used to authenticate legitimate transactions had been artificially created to validate these unauthorized transfers. Which of the following best describes the kind of attack the bank is experiencing?
This is an instance of Digital signature forgery, where the attacker has created fraudulent digital signatures to authorize transactions, typically by finding a way to replicate the signature creation process without access to the legitimate private key. Message digest tampering would involve altering the actual content of the message which is then covered by a signature or MAC, rather than forging a signature itself. Repudiation attacks involve denying the performance of an action in a communication process, not forging signatures. Lastly, cryptanalysis refers to the method of analyzing and breaking cryptographic securities, not specifically creating forged signatures.
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What is a digital signature and how does it work?
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How can digital signatures be forged?
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What are the implications of digital signature forgery for a bank?