{"action":"created","issue":{"url":"https://api.github.com/repos/zcash/zcash/issues/714","repository_url":"https://api.github.com/repos/zcash/zcash","labels_url":"https://api.github.com/repos/zcash/zcash/issues/714/labels{/name}","comments_url":"https://api.github.com/repos/zcash/zcash/issues/714/comments","events_url":"https://api.github.com/repos/zcash/zcash/issues/714/events","html_url":"https://github.com/zcash/zcash/issues/714","id":132192178,"number":714,"title":"understand the concrete security level of the BN_128 curve in libsnark","user":{"login":"daira","id":643204,"avatar_url":"https://avatars.githubusercontent.com/u/643204?v=3","gravatar_id":"","url":"https://api.github.com/users/daira","html_url":"https://github.com/daira","followers_url":"https://api.github.com/users/daira/followers","following_url":"https://api.github.com/users/daira/following{/other_user}","gists_url":"https://api.github.com/users/daira/gists{/gist_id}","starred_url":"https://api.github.com/users/daira/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/daira/subscriptions","organizations_url":"https://api.github.com/users/daira/orgs","repos_url":"https://api.github.com/users/daira/repos","events_url":"https://api.github.com/users/daira/events{/privacy}","received_events_url":"https://api.github.com/users/daira/received_events","type":"User","site_admin":false},"labels":[{"id":161973759,"url":"https://api.github.com/repos/zcash/zcash/labels/crypto","name":"crypto","color":"ff6b75","default":false},{"id":252174130,"url":"https://api.github.com/repos/zcash/zcash/labels/in%201.0","name":"in 1.0","color":"ffc987","default":false},{"id":154399967,"url":"https://api.github.com/repos/zcash/zcash/labels/libsnark","name":"libsnark","color":"aee2b0","default":false},{"id":150272750,"url":"https://api.github.com/repos/zcash/zcash/labels/question","name":"question","color":"cc317c","default":true},{"id":152089339,"url":"https://api.github.com/repos/zcash/zcash/labels/SECURITY","name":"SECURITY","color":"e01010","default":false},{"id":252192815,"url":"https://api.github.com/repos/zcash/zcash/labels/special%20to%20Daira","name":"special to Daira","color":"ffa480","default":false},{"id":294016066,"url":"https://api.github.com/repos/zcash/zcash/labels/Threat%20Model","name":"Threat Model","color":"46f5f9","default":false},{"id":192440353,"url":"https://api.github.com/repos/zcash/zcash/labels/zkSNARK%20circuit","name":"zkSNARK circuit","color":"ff5b55","default":false}],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":{"url":"https://api.github.com/repos/zcash/zcash/milestones/41","html_url":"https://github.com/zcash/zcash/milestones/Wishlist%20-%20Soon%20After%201.0.[Soon]","labels_url":"https://api.github.com/repos/zcash/zcash/milestones/41/labels","id":2040259,"number":41,"title":"Wishlist - Soon After 1.0.[Soon]","description":"","creator":{"login":"daira","id":643204,"avatar_url":"https://avatars.githubusercontent.com/u/643204?v=3","gravatar_id":"","url":"https://api.github.com/users/daira","html_url":"https://github.com/daira","followers_url":"https://api.github.com/users/daira/followers","following_url":"https://api.github.com/users/daira/following{/other_user}","gists_url":"https://api.github.com/users/daira/gists{/gist_id}","starred_url":"https://api.github.com/users/daira/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/daira/subscriptions","organizations_url":"https://api.github.com/users/daira/orgs","repos_url":"https://api.github.com/users/daira/repos","events_url":"https://api.github.com/users/daira/events{/privacy}","received_events_url":"https://api.github.com/users/daira/received_events","type":"User","site_admin":false},"open_issues":43,"closed_issues":0,"state":"open","created_at":"2016-09-30T14:57:38Z","updated_at":"2016-11-17T18:13:09Z","due_on":null,"closed_at":null},"comments":17,"created_at":"2016-02-08T16:40:30Z","updated_at":"2016-11-25T18:16:45Z","closed_at":null,"body":""},"comment":{"url":"https://api.github.com/repos/zcash/zcash/issues/comments/263007229","html_url":"https://github.com/zcash/zcash/issues/714#issuecomment-263007229","issue_url":"https://api.github.com/repos/zcash/zcash/issues/714","id":263007229,"user":{"login":"zookozcash","id":16416064,"avatar_url":"https://avatars.githubusercontent.com/u/16416064?v=3","gravatar_id":"","url":"https://api.github.com/users/zookozcash","html_url":"https://github.com/zookozcash","followers_url":"https://api.github.com/users/zookozcash/followers","following_url":"https://api.github.com/users/zookozcash/following{/other_user}","gists_url":"https://api.github.com/users/zookozcash/gists{/gist_id}","starred_url":"https://api.github.com/users/zookozcash/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/zookozcash/subscriptions","organizations_url":"https://api.github.com/users/zookozcash/orgs","repos_url":"https://api.github.com/users/zookozcash/repos","events_url":"https://api.github.com/users/zookozcash/events{/privacy}","received_events_url":"https://api.github.com/users/zookozcash/received_events","type":"User","site_admin":false},"created_at":"2016-11-25T18:16:45Z","updated_at":"2016-11-25T18:16:45Z","body":"http://eprint.iacr.org/2016/1102.pdf\r\n\r\nI skimmed this, and asked Matt Green what it meant.\r\n\r\nFrom the paper:\r\n\r\n> In summary, if one is aiming for the 128-bit security level, then the bitlength of p should be at least 383, 384, 342 and 320 for BN, BLS12, KSS and BLS24 pairings.\r\n\r\nSo I said \"But what then is the estimated strength of the BN_128 curve that we are currently using?\r\n\r\nMatt wrote:\r\n\r\n> Probably 96-100 bits which is still well in excess of RSA-2048. To be prudent we should probably upgrade within a year or so."}}
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