{"group":{"id":1,"name":"Community","lockable":false,"created_at":"2012-01-18T18:02:15.000Z","updated_at":"2025-12-14T01:33:56.000Z","description":"Problems submitted by members of the MATLAB Central community.","is_default":true,"created_by":161519,"badge_id":null,"featured":false,"trending":false,"solution_count_in_trending_period":0,"trending_last_calculated":"2025-12-14T00:00:00.000Z","image_id":null,"published":true,"community_created":false,"status_id":2,"is_default_group_for_player":false,"deleted_by":null,"deleted_at":null,"restored_by":null,"restored_at":null,"description_opc":null,"description_html":null,"published_at":null},"problems":[{"id":61050,"title":"Generate Secret Key for Cryptography ","description":"From a seed file (code.wav), decode the audio file (Bell 202 format at 200 bits/sec) into a binary stream and then convert the binary stream into a decimal vector (uint8) that should be hashed using SHA - 224, 256, 384, or 514 based on the function input. Output the hexadecimal hash (in lower case). ","description_html":"\u003cdiv style = \"text-align: start; line-height: 20.440001px; min-height: 0px; white-space: normal; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, monospace; font-style: normal; font-size: 14px; font-weight: 400; text-decoration: none; white-space: normal; \"\u003e\u003cdiv style=\"block-size: 63px; display: block; min-width: 0px; padding-block-start: 0px; padding-top: 0px; perspective-origin: 344px 31.5px; transform-origin: 344px 31.5px; vertical-align: baseline; \"\u003e\u003cdiv style=\"font-family: Helvetica, Arial, sans-serif; line-height: 21px; margin-block-end: 9px; margin-block-start: 2px; margin-bottom: 9px; margin-inline-end: 10px; margin-inline-start: 4px; margin-left: 4px; margin-right: 10px; margin-top: 2px; perspective-origin: 321px 31.5px; text-align: left; transform-origin: 321px 31.5px; white-space-collapse: preserve; margin-left: 4px; margin-top: 2px; margin-bottom: 9px; margin-right: 10px; \"\u003e\u003cspan style=\"block-size: auto; display: inline; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-end: 0px; margin-inline-start: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; perspective-origin: 0px 0px; transform-origin: 0px 0px; \"\u003e\u003cspan style=\"\"\u003eFrom a seed file (code.wav), decode the audio file (Bell 202 format at 200 bits/sec) into a binary stream and then convert the binary stream into a decimal vector (uint8) that should be hashed using SHA - 224, 256, 384, or 514 based on the function input. Output the hexadecimal hash (in lower case). \u003c/span\u003e\u003c/span\u003e\u003c/div\u003e\u003c/div\u003e\u003c/div\u003e","function_template":"function s = generateSecretKey(d)\r\ns='ab13';\r\nend","test_suite":"%%\r\ndropboxLink = 'https://www.dropbox.com/scl/fi/9g51et5mg6oir3rzckgmq/code.wav?rlkey=kujbm4wvj8k8n2fsav36ie3fo\u0026st=udr92tru\u0026dl=1';\r\nwebsave('code.wav', dropboxLink);\r\nassert(isequal('9b9011a6f9075acc3bf9aa9d58f117d2a457df1ad4c1fc800654ed4728699654',generateSecretKey(256)));\r\nassert(isequal('b4d6dfe609125ee60a481568d23ecdd0394ee272b50ef9e901c8d3610fbf64dad79ef569607864da83b635b590edf2a82a7d300fb37f9a61664d05b1445dc3a9',generateSecretKey(512)));\r\nassert(isequal('125da2fb2c851a0ec8d1feb68e5f6b7c5e951b809e3b58400c955840',generateSecretKey(224)));\r\nassert(isequal('fa4391ce471e89fc5232aa0aa9d8ed70738fc526029370f09fd9cb4d7439e8825aeacba72ea65a6109b7a964ae4cf114',generateSecretKey(384)));\r\n%%\r\ndropboxLink = 'https://www.dropbox.com/scl/fi/ezhpy2a6u9tel2v53pdco/code1.wav?rlkey=5yg3bx0dqochp2jcalvzjs1ws\u0026st=d5ekkeuw\u0026dl=1';\r\nwebsave('code.wav', dropboxLink);\r\nassert(isequal('1fd510e7e4777fd25aa2b75468ea9949fac17fa43004c92c8f906da57a0856a2',generateSecretKey(256)));\r\nassert(isequal('48132c1a6789a3a4c161436fd9b09353767a8dad70c90f7c37bd8fe89a15cad3d961ac2c0fe594fe951ede62dca77cff4a67668bd0d35091b60ad46e547dd883',generateSecretKey(512)));\r\nassert(isequal('de27d369a5ecf458537c39fac1d7a3d5d075dfbbd251caa110a1340d',generateSecretKey(224)));\r\nassert(isequal('0e3d5fb4ec12cd4cc97d1c272afa8c3d280d1626727f4366ce41acd0ece2aeeee6357bd29aa6833b18f75a9744766fb6',generateSecretKey(384)));\r\n%%\r\ndropboxLink = 'https://www.dropbox.com/scl/fi/a2tmz2axfex2sxa1pm4f6/code2.wav?rlkey=4p50pxytoyudkgv27hnskhamr\u0026st=eocw0ote\u0026dl=1';\r\nwebsave('code.wav', dropboxLink);\r\nassert(isequal('689dd116f955d1489ae5a0b82731e8f641de70366cf153c273a5aceb0bce882d',generateSecretKey(256)));\r\nassert(isequal('0bdbb0437718cf66746eaeb083217127a165f3cb4fed63132859cf1dcc79b78ac7997d00d6460e2b9853980de69ee7819a1605488ece34c84efbfa790cad516e',generateSecretKey(512)));\r\nassert(isequal('1fc1b7790c3bc1e2f7d292befca59d5f553e272898691e37d5d68b98',generateSecretKey(224)));\r\nassert(isequal('61e71c53762b02af99b8b4b212dc4cd78ba71750ab97927d52d2d63f36fbdb26e1e203b32b87867b1e8c0ac44de2531a',generateSecretKey(384)));\r\n%%\r\n\r\n","published":true,"deleted":false,"likes_count":0,"comments_count":2,"created_by":145982,"edited_by":145982,"edited_at":"2025-10-27T11:40:10.000Z","deleted_by":null,"deleted_at":null,"solvers_count":2,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2025-10-25T00:11:13.000Z","updated_at":"2026-02-26T14:02:17.000Z","published_at":"2025-10-25T00:11:13.000Z","restored_at":null,"restored_by":null,"spam":null,"simulink":false,"admin_reviewed":false,"description_opc":"{\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eFrom a seed file (code.wav), decode the audio file (Bell 202 format at 200 bits/sec) into a binary stream and then convert the binary stream into a decimal vector (uint8) that should be hashed using SHA - 224, 256, 384, or 514 based on the function input. Output the hexadecimal hash (in lower case). \u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\",\"relationship\":null}],\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"target\":\"/matlab/document.xml\",\"relationshipId\":\"rId1\"}]}"}],"problem_search":{"errors":[],"problems":[{"id":61050,"title":"Generate Secret Key for Cryptography ","description":"From a seed file (code.wav), decode the audio file (Bell 202 format at 200 bits/sec) into a binary stream and then convert the binary stream into a decimal vector (uint8) that should be hashed using SHA - 224, 256, 384, or 514 based on the function input. Output the hexadecimal hash (in lower case). ","description_html":"\u003cdiv style = \"text-align: start; line-height: 20.440001px; min-height: 0px; white-space: normal; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, monospace; font-style: normal; font-size: 14px; font-weight: 400; text-decoration: none; white-space: normal; \"\u003e\u003cdiv style=\"block-size: 63px; display: block; min-width: 0px; padding-block-start: 0px; padding-top: 0px; perspective-origin: 344px 31.5px; transform-origin: 344px 31.5px; vertical-align: baseline; \"\u003e\u003cdiv style=\"font-family: Helvetica, Arial, sans-serif; line-height: 21px; margin-block-end: 9px; margin-block-start: 2px; margin-bottom: 9px; margin-inline-end: 10px; margin-inline-start: 4px; margin-left: 4px; margin-right: 10px; margin-top: 2px; perspective-origin: 321px 31.5px; text-align: left; transform-origin: 321px 31.5px; white-space-collapse: preserve; margin-left: 4px; margin-top: 2px; margin-bottom: 9px; margin-right: 10px; \"\u003e\u003cspan style=\"block-size: auto; display: inline; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-end: 0px; margin-inline-start: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; perspective-origin: 0px 0px; transform-origin: 0px 0px; \"\u003e\u003cspan style=\"\"\u003eFrom a seed file (code.wav), decode the audio file (Bell 202 format at 200 bits/sec) into a binary stream and then convert the binary stream into a decimal vector (uint8) that should be hashed using SHA - 224, 256, 384, or 514 based on the function input. Output the hexadecimal hash (in lower case). \u003c/span\u003e\u003c/span\u003e\u003c/div\u003e\u003c/div\u003e\u003c/div\u003e","function_template":"function s = generateSecretKey(d)\r\ns='ab13';\r\nend","test_suite":"%%\r\ndropboxLink = 'https://www.dropbox.com/scl/fi/9g51et5mg6oir3rzckgmq/code.wav?rlkey=kujbm4wvj8k8n2fsav36ie3fo\u0026st=udr92tru\u0026dl=1';\r\nwebsave('code.wav', dropboxLink);\r\nassert(isequal('9b9011a6f9075acc3bf9aa9d58f117d2a457df1ad4c1fc800654ed4728699654',generateSecretKey(256)));\r\nassert(isequal('b4d6dfe609125ee60a481568d23ecdd0394ee272b50ef9e901c8d3610fbf64dad79ef569607864da83b635b590edf2a82a7d300fb37f9a61664d05b1445dc3a9',generateSecretKey(512)));\r\nassert(isequal('125da2fb2c851a0ec8d1feb68e5f6b7c5e951b809e3b58400c955840',generateSecretKey(224)));\r\nassert(isequal('fa4391ce471e89fc5232aa0aa9d8ed70738fc526029370f09fd9cb4d7439e8825aeacba72ea65a6109b7a964ae4cf114',generateSecretKey(384)));\r\n%%\r\ndropboxLink = 'https://www.dropbox.com/scl/fi/ezhpy2a6u9tel2v53pdco/code1.wav?rlkey=5yg3bx0dqochp2jcalvzjs1ws\u0026st=d5ekkeuw\u0026dl=1';\r\nwebsave('code.wav', dropboxLink);\r\nassert(isequal('1fd510e7e4777fd25aa2b75468ea9949fac17fa43004c92c8f906da57a0856a2',generateSecretKey(256)));\r\nassert(isequal('48132c1a6789a3a4c161436fd9b09353767a8dad70c90f7c37bd8fe89a15cad3d961ac2c0fe594fe951ede62dca77cff4a67668bd0d35091b60ad46e547dd883',generateSecretKey(512)));\r\nassert(isequal('de27d369a5ecf458537c39fac1d7a3d5d075dfbbd251caa110a1340d',generateSecretKey(224)));\r\nassert(isequal('0e3d5fb4ec12cd4cc97d1c272afa8c3d280d1626727f4366ce41acd0ece2aeeee6357bd29aa6833b18f75a9744766fb6',generateSecretKey(384)));\r\n%%\r\ndropboxLink = 'https://www.dropbox.com/scl/fi/a2tmz2axfex2sxa1pm4f6/code2.wav?rlkey=4p50pxytoyudkgv27hnskhamr\u0026st=eocw0ote\u0026dl=1';\r\nwebsave('code.wav', dropboxLink);\r\nassert(isequal('689dd116f955d1489ae5a0b82731e8f641de70366cf153c273a5aceb0bce882d',generateSecretKey(256)));\r\nassert(isequal('0bdbb0437718cf66746eaeb083217127a165f3cb4fed63132859cf1dcc79b78ac7997d00d6460e2b9853980de69ee7819a1605488ece34c84efbfa790cad516e',generateSecretKey(512)));\r\nassert(isequal('1fc1b7790c3bc1e2f7d292befca59d5f553e272898691e37d5d68b98',generateSecretKey(224)));\r\nassert(isequal('61e71c53762b02af99b8b4b212dc4cd78ba71750ab97927d52d2d63f36fbdb26e1e203b32b87867b1e8c0ac44de2531a',generateSecretKey(384)));\r\n%%\r\n\r\n","published":true,"deleted":false,"likes_count":0,"comments_count":2,"created_by":145982,"edited_by":145982,"edited_at":"2025-10-27T11:40:10.000Z","deleted_by":null,"deleted_at":null,"solvers_count":2,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2025-10-25T00:11:13.000Z","updated_at":"2026-02-26T14:02:17.000Z","published_at":"2025-10-25T00:11:13.000Z","restored_at":null,"restored_by":null,"spam":null,"simulink":false,"admin_reviewed":false,"description_opc":"{\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003cw:jc w:val=\\\"left\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eFrom a seed file (code.wav), decode the audio file (Bell 202 format at 200 bits/sec) into a binary stream and then convert the binary stream into a decimal vector (uint8) that should be hashed using SHA - 224, 256, 384, or 514 based on the function input. Output the hexadecimal hash (in lower case). \u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\",\"relationship\":null}],\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"target\":\"/matlab/document.xml\",\"relationshipId\":\"rId1\"}]}"}],"term":"tag:\"sha\"","current_player_id":null,"fields":[{"name":"page","type":"integer","callback":null,"default":1,"directive":null,"facet":null,"facet_method":"and","operator":null,"param":null,"static":null,"prepend":true},{"name":"per_page","type":"integer","callback":null,"default":50,"directive":null,"facet":null,"facet_method":"and","operator":null,"param":null,"static":null,"prepend":true},{"name":"sort","type":"string","callback":null,"default":null,"directive":null,"facet":null,"facet_method":"and","operator":null,"param":null,"static":null,"prepend":true},{"name":"body","type":"text","callback":null,"default":"*:*","directive":null,"facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":false},{"name":"group","type":"string","callback":null,"default":null,"directive":"group","facet":true,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"difficulty_rating_bin","type":"string","callback":null,"default":null,"directive":"difficulty_rating_bin","facet":true,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"id","type":"integer","callback":null,"default":null,"directive":"id","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"tag","type":"string","callback":null,"default":null,"directive":"tag","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"product","type":"string","callback":null,"default":null,"directive":"product","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"created_at","type":"timeframe","callback":{},"default":null,"directive":"created_at","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"profile_id","type":"integer","callback":null,"default":null,"directive":"author_id","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"created_by","type":"string","callback":null,"default":null,"directive":"author","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"player_id","type":"integer","callback":null,"default":null,"directive":"solver_id","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"player","type":"string","callback":null,"default":null,"directive":"solver","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"solvers_count","type":"integer","callback":null,"default":null,"directive":"solvers_count","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"comments_count","type":"integer","callback":null,"default":null,"directive":"comments_count","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"likes_count","type":"integer","callback":null,"default":null,"directive":"likes_count","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"leader_id","type":"integer","callback":null,"default":null,"directive":"leader_id","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"leading_solution","type":"integer","callback":null,"default":null,"directive":"leading_solution","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true}],"filters":[{"name":"asset_type","type":"string","callback":null,"default":null,"directive":null,"facet":null,"facet_method":"and","operator":null,"param":null,"static":"\"cody:problem\"","prepend":true},{"name":"profile_id","type":"integer","callback":{},"default":null,"directive":null,"facet":null,"facet_method":"and","operator":null,"param":"author_id","static":null,"prepend":true}],"query":{"params":{"per_page":50,"term":"tag:\"sha\"","current_player":null,"sort":"map(difficulty_value,0,0,999) asc"},"parser":"MathWorks::Search::Solr::QueryParser","directives":{"term":{"directives":{"tag":[["tag:\"sha\"","","\"","sha","\""]]}}},"facets":{"#\u003cMathWorks::Search::Field:0x00007fac45acf8c0\u003e":null,"#\u003cMathWorks::Search::Field:0x00007fac45acf820\u003e":null},"filters":{"#\u003cMathWorks::Search::Field:0x00007fac45aceec0\u003e":"\"cody:problem\""},"fields":{"#\u003cMathWorks::Search::Field:0x00007fac45acfb40\u003e":1,"#\u003cMathWorks::Search::Field:0x00007fac45acfaa0\u003e":50,"#\u003cMathWorks::Search::Field:0x00007fac45acfa00\u003e":"map(difficulty_value,0,0,999) 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v1.0.1"},"params":{},"options":{"params_encoder":"Faraday::FlatParamsEncoder","proxy":null,"bind":null,"timeout":null,"open_timeout":null,"read_timeout":null,"write_timeout":null,"boundary":null,"oauth":null,"context":null,"on_data":null},"ssl":{"verify":true,"ca_file":null,"ca_path":null,"verify_mode":null,"cert_store":null,"client_cert":null,"client_key":null,"certificate":null,"private_key":null,"verify_depth":null,"version":null,"min_version":null,"max_version":null},"default_parallel_manager":null,"builder":{"adapter":{"name":"Faraday::Adapter::NetHttp","args":[],"block":null},"handlers":[{"name":"Faraday::Response::RaiseError","args":[],"block":null}],"app":{"app":{"ssl_cert_store":{"verify_callback":null,"error":null,"error_string":null,"chain":null,"time":null},"app":{},"connection_options":{},"config_block":null}}},"url_prefix":"http://search-op-v2/solr/cody/","manual_proxy":false,"proxy":null},"update_format":"RSolr::JSON::Generator","update_path":"update","options":{"url":"http://search-op-v2/solr/cody"}}},"query":{"params":{"per_page":50,"term":"tag:\"sha\"","current_player":null,"sort":"map(difficulty_value,0,0,999) asc"},"parser":"MathWorks::Search::Solr::QueryParser","directives":{"term":{"directives":{"tag":[["tag:\"sha\"","","\"","sha","\""]]}}},"facets":{"#\u003cMathWorks::Search::Field:0x00007fac45acf8c0\u003e":null,"#\u003cMathWorks::Search::Field:0x00007fac45acf820\u003e":null},"filters":{"#\u003cMathWorks::Search::Field:0x00007fac45aceec0\u003e":"\"cody:problem\""},"fields":{"#\u003cMathWorks::Search::Field:0x00007fac45acfb40\u003e":1,"#\u003cMathWorks::Search::Field:0x00007fac45acfaa0\u003e":50,"#\u003cMathWorks::Search::Field:0x00007fac45acfa00\u003e":"map(difficulty_value,0,0,999) asc","#\u003cMathWorks::Search::Field:0x00007fac45acf960\u003e":"tag:\"sha\""},"user_query":{"#\u003cMathWorks::Search::Field:0x00007fac45acf960\u003e":"tag:\"sha\""},"queried_facets":{}},"options":{"fields":["id","difficulty_rating"]},"join":" "},"results":[{"id":61050,"difficulty_rating":"easy-medium"}]}}