Problem 45213. AES-256 KeyExpansion()

Created by David Hill

Solve Later

{"relationships":[{"relationshipType":"http://schemas.mathworks.com/matlab/code/2013/relationships/document","targetMode":"","relationshipId":"rId1","target":"/matlab/document.xml"},{"relationshipType":"http://schemas.mathworks.com/matlab/code/2013/relationships/output","targetMode":"","relationshipId":"rId2","target":"/matlab/output.xml"}],"parts":[{"partUri":"/matlab/document.xml","relationship":[],"contentType":"application/vnd.mathworks.matlab.code.document+xml","content":"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<w:document xmlns:w=\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\"><w:body><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Given a 32-byte hexadecimal character array representing the AES-256 input key, execute the AES-256 algorithm, KeyExpansion() and output the xth (input) key-word of this 60-word sequence as a 4x2 hexadecimal array. You will need the SubBytes() function done in one of my previous Cody problems.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Refer to this link:</w:t></w:r><w:r><w:t> </w:t></w:r><w:hyperlink w:docLocation=\"https://csrc.nist.gov/csrc/media/publications/fips/197/final/documents/fips-197.pdf\"><w:r><w:t>&lt;https://csrc.nist.gov/csrc/media/publications/fips/197/final/documents/fips-197.pdf</w:t></w:r></w:hyperlink><w:r><w:t>&gt;</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>For example:</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[key='e32868331fa8ef0138de0de85478346aec5e3912b6029ae71691c384237a3eeb';\nx=58;%want key-word number 58 out of 60\nw=['d0';'eb';'7c';'8a'];%58th key-word]]></w:t></w:r></w:p></w:body></w:document>"},{"partUri":"/matlab/output.xml","contentType":"text/xml","content":"<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\" ?><embeddedOutputs><metaData><evaluationState>manual</evaluationState><layoutState>code</layoutState><outputStatus>ready</outputStatus></metaData><outputArray type=\"array\"/><regionArray type=\"array\"/></embeddedOutputs>"}]}

Solve

Solution Stats

3 Solutions
2 Solvers

Last Solution submitted on Nov 27, 2019

Last 200 Solutions

Problem Recent Solvers2

Problem Tags

advanced encryption standard cryptography

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Problem 45213. AES-256 KeyExpansion()

Solution Stats

Last 200 Solutions

Problem Recent Solvers2

Suggested Problems

More from this Author29

Problem Tags

Community Treasure Hunt

Problem 45213. AES-256 KeyExpansion()

Solution Stats

Last 200 Solutions

Problem Recent Solvers2

Suggested Problems

More from this Author29

Problem Tags

Community Treasure Hunt

Players