{"id":166321,"date":"2018-11-06T17:21:28","date_gmt":"2018-11-07T01:21:28","guid":{"rendered":"https:\/\/www.microsoft.com\/en-us\/research\/msr-research-item\/a-note-on-quantum-related-key-attacks\/"},"modified":"2018-11-06T17:21:28","modified_gmt":"2018-11-07T01:21:28","slug":"a-note-on-quantum-related-key-attacks","status":"publish","type":"msr-research-item","link":"https:\/\/www.microsoft.com\/en-us\/research\/publication\/a-note-on-quantum-related-key-attacks\/","title":{"rendered":"A note on quantum related-key attacks"},"content":{"rendered":"<div class=\"asset-content\">\n<p>In a basic related-key attack against a block cipher, the adversary has access to encryptions under keys that differ from the target key by bit-flips. In this short note we show that for a quantum adversary such attacks are quite powerful: if the secret key is (i) uniquely determined by a small number of plaintext-ciphertext pairs, (ii) the block cipher can be evaluated efficiently, and (iii) a superposition of related keys can be queried, then the key can be extracted efficiently.<\/p>\n<\/div>\n<p><!-- .asset-content --><\/p>\n","protected":false},"excerpt":{"rendered":"<p>In a basic related-key attack against a block cipher, the adversary has access to encryptions under keys that differ from the target key by bit-flips. In this short note we show that for a quantum adversary such attacks are quite powerful: if the secret key is (i) uniquely determined by a small number of plaintext-ciphertext 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