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All Projects → duesee → bleichenbacher

duesee / bleichenbacher

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Bleichenbachers "Million message attack" on RSA in Python

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cryptographyrsapadding-oracle-attackspkcs1bleichenbacher

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Bleichenbachers "Million Message Attack" on RSA

This repo contains two python projects to demonstrate Daniel Bleichenbacher's million message attack against RSA encryption and PKCS #1 padding.

PKCS #1 Padding Oracle

The bleichenbacher oracle is implemented in Bleichenbacher_Oracle.

RSA Parity Oracle

The effects of leaking the LSB (the Parity-Bit) of an RSA plaintext is demonstrated via Parity_Oracle.

The code is mostly taken from Practical-Padding-Oracle-Attacks-on-RSA. Since we find it very helpful to understand the Bleichenbacher oracle, it is included here as well.

Good to know

  • The python-crypto package is needed. Please install it.
  • Text in Python 3 is always Unicode and represented by the str type. Binary data is represented by the bytes type. Please see http://eli.thegreenplace.net/2012/01/30/the-bytesstr-dichotomy-in-python-3 for further information.
  • We had some trouble with type errors during development. Thus, many functions are type-checked via a custom decorator and special annotations. (We found this pattern to be very useful in many scenarios.)

Literature

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