I thought that was a known fact. I often hear about people who can't attend security-related conferences because of visa problems. Last year at the CRYPTO/CHES/FDTC/PROOFS week in Santa Barbara at least three researchers (from India IIRC) couldn't make it because of visa problems, while they had accepted papers at one of the conference!
In many lab outside of the US, we are told not to be to verbose about the type of conferences we are going to attend in the US. Words such as "security", "cryptography", "side-channel attacks", "fault injection attacks", etc. must be banned from the application. Instead we just say that we are going to a "computer science conference" or "information processing conference" for instance.
In many lab outside of the US, we are told not to be to verbose about the type of conferences we are going to attend in the US. Words such as "security", "cryptography", "side-channel attacks", "fault injection attacks", etc. must be banned from the application. Instead we just say that we are going to a "computer science conference" or "information processing conference" for instance.