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The NoSuchCon challenge was published in September 2014, for the second edition of the NoSuchCon conference. The last step of this challenge consists in exploiting a remote cryptographic service used to store encrypted messages and keys. To solve this step, a timing attack against the CPU cache was used. The access time for certain memory areas is measured regularly.
The time spent reading those memory areas depends on previous hits, this side-channel information can be used to extract data. This talk will explain the technique commonly called "Cache Attack" based on some existing papers, a demonstration will be conducted showing the extraction of the RSA private key.