1 | initial version |

If you want to work mod 256, you should work with `Integers(256)`

, not `GF(256)`

. (The first of these is the ring `Z/256`

, the second is the field with 256 elements.)

```
sage: matrix(Integers(256), [1,2,3,4])
[1 2 3 4]
```

`IntegerModRing(256)`

is a synonym for `Integers(256)`

, by the way.

2 | No.2 Revision |

If you want to work mod 256, you should work with `Integers(256)`

, not `GF(256)`

. (The first of these is the ring `Z/256`

, the second is the field with 256 elements.)

```
sage: matrix(Integers(256), [1,2,3,4])
[1 2 3 4]
sage: matrix(Integers(256), [254, 255, 256, 257])
[254 255 0 1]
```

(edited to add the second example)

`IntegerModRing(256)`

is a synonym for `Integers(256)`

, by the way.

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