{"action":"created","issue":{"url":"https://api.github.com/repos/shaih/HElib/issues/198","repository_url":"https://api.github.com/repos/shaih/HElib","labels_url":"https://api.github.com/repos/shaih/HElib/issues/198/labels{/name}","comments_url":"https://api.github.com/repos/shaih/HElib/issues/198/comments","events_url":"https://api.github.com/repos/shaih/HElib/issues/198/events","html_url":"https://github.com/shaih/HElib/issues/198","id":315101496,"number":198,"title":"Noise estimate question","user":{"login":"Jyun-Neng","id":25876033,"avatar_url":"https://avatars1.githubusercontent.com/u/25876033?v=4","gravatar_id":"","url":"https://api.github.com/users/Jyun-Neng","html_url":"https://github.com/Jyun-Neng","followers_url":"https://api.github.com/users/Jyun-Neng/followers","following_url":"https://api.github.com/users/Jyun-Neng/following{/other_user}","gists_url":"https://api.github.com/users/Jyun-Neng/gists{/gist_id}","starred_url":"https://api.github.com/users/Jyun-Neng/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/Jyun-Neng/subscriptions","organizations_url":"https://api.github.com/users/Jyun-Neng/orgs","repos_url":"https://api.github.com/users/Jyun-Neng/repos","events_url":"https://api.github.com/users/Jyun-Neng/events{/privacy}","received_events_url":"https://api.github.com/users/Jyun-Neng/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2018-04-17T15:01:09Z","updated_at":"2018-04-17T17:17:08Z","closed_at":null,"author_association":"NONE","body":"In section 3.1.4 of the document, you say that \"As the l2 norm of the canonical embedding of m is larger by a  (phi(m))^2 factor than the l2 norm of its coefficient vector, we therefore use the condition (noiseVar)^1/2 >= q/2 as our decryption-error condition.\" I'm confused about it. \r\n\r\nWhy can we just use the condition (noiseVar)^1/2 >= q/2? It seems that the standard deviation (noiseVar)^1/2 is larger enough than the standard deviation of each coefficient in m. \r\n\r\nThe standard deviation of the canonical embedding of m is (phi(m)*noiseVar)^1/2. If we just use the condition above, in my opinion, it is not enough to ensure that the variable will not exceed q/2.\r\n\r\nCan you give me some examples or details? \r\nThanks."},"comment":{"url":"https://api.github.com/repos/shaih/HElib/issues/comments/382072612","html_url":"https://github.com/shaih/HElib/issues/198#issuecomment-382072612","issue_url":"https://api.github.com/repos/shaih/HElib/issues/198","id":382072612,"user":{"login":"shaih","id":4069370,"avatar_url":"https://avatars1.githubusercontent.com/u/4069370?v=4","gravatar_id":"","url":"https://api.github.com/users/shaih","html_url":"https://github.com/shaih","followers_url":"https://api.github.com/users/shaih/followers","following_url":"https://api.github.com/users/shaih/following{/other_user}","gists_url":"https://api.github.com/users/shaih/gists{/gist_id}","starred_url":"https://api.github.com/users/shaih/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/shaih/subscriptions","organizations_url":"https://api.github.com/users/shaih/orgs","repos_url":"https://api.github.com/users/shaih/repos","events_url":"https://api.github.com/users/shaih/events{/privacy}","received_events_url":"https://api.github.com/users/shaih/received_events","type":"User","site_admin":false},"created_at":"2018-04-17T17:17:08Z","updated_at":"2018-04-17T17:17:08Z","author_association":"OWNER","body":"We are working on improving the noise management in HElib, making it a little less \"hackish\", I will try to also improve the documentation while we're at it. I hope to have this change ready sometime in the summer."}}
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