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Several protocols which implement the digital enveloping method, described in version 1.5 of the PKCS #1 standard, are susceptible to an adaptive ciphertext attack. This allows the recovery of session keys, thus compromising the integrity of the data transmitting during that session. The data encryption techniques described in RSA's PKCS #1 standard are used in many protocols which rely on, at least in part, the security provided by public-key cryptography systems.
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