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Wednesday, August 5 • 12:00 - 12:25
Backdooring MS Office documents with secret master keys

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Recent MS Office documents are normally encrypted very strongly, making them difficult to brute force. However, there are techniques an attacker can use to secretly backdoor these encrypted documents to make them trivial to decrypt. Cloud environments may be more dangerous than thought as it is not possible for users to confirm the security of their encryption and it would be easy for cloud providers (or advanced attackers with access to those cloud providers) to backdoor encryption in undetectable ways. I believe that this is a serious problem that the security industry needs to consider.


Shigeo Mitsunari

Shigeo Mitsunari is a software developer and researcher. He is interested in cryptography, in particular, pairing-based cryptography and its implementation. He developes a x86/x64 JIT assembler Xbyak and very fast C++ pairing library which are open source projects. He was received... Read More →
avatar for Yoshinori Takesako

Yoshinori Takesako

chairperson, SECCON
Yoshinori Takesako is the executive committee chairperson, organizer, and challenge creator of the SECCON CTF contests that are held several times a year throughout Japan including large international online and in-person contests. He is also on the OWASP Japan advisory board, the... Read More →

Wednesday August 5, 2015 12:00 - 12:25 PDT
Common Ground Florentine G

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