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| Cryptanalysis of PKCS#1 | |
| Author: | Thomas Baignères |
| Supervisor: | Pascal Junod |
| Date: | Winter Semester 2001-2002 |
| Abstract: | In this project we consider the chosen ciphertext attacks against protocols based on the RSA encryption standard PKCS#1 that Daniel Bleichenbacher implemented in 1998. The attack can be performed if the attacker has access to a server which returns a message every time he receives a message which is not PKCS#1 conforming. By sending a certain number of chosen ciphertexts, the attacker will be able to decrypt any given ciphertext even if he doesn't know the RSA's private key. |