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New Attack Against RSA

Schneier on Security
· September 28, 2026

AI summary

A reported attack against RSA is not new, as the original research dates back to 2007, but a new implementation has been developed. This attack is a forgery attack that allows an attacker to forge digital signatures, but it does not enable the recovery of the private key from the public key. The attack is limited to pure signatures without formatting or padding, which is not a common use of RSA in practice. The algorithm used is subexponential-time, which, while relatively fast, is not as efficient as a polynomial-time algorithm. The attack's speed is relative and should be considered in context. The implementation is what is new, not the underlying attack itself.

Read the full article at Schneier on Securitywww.schneier.com/blog/archives/2026/09/new-attack-against-rsa.html

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