/usr/share/sagemath/ellcurves/rank28 is in sagemath-database-elliptic-curves 0.8-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | 3455601108357547341532253864901605231198511505793733138900595189472144724781456635380154149870961231592352897621963802238155192936274322687070 a 1 [1,-1,1,-20067762415575526585033208209338542750930230312178956502,34481611795030556467032985690390720374855944359319180361266008296291939448732243429] 28 1
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