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Comment Re:Anyone is surprised about this? (Score 3) 63

"What encryption were you going to run on Z80 class processors?"

Wasn’t rhetorical? Cool — here's a serious answer.

XTEA is one of the strongest ciphers that can reasonably run on a Z80. It’s a 64-bit block cipher with a 128-bit key and a very compact footprint — perfect for 8-bit systems. The operations are just shifts, XORs, and adds, so it’s lightweight and doesn’t require much RAM or code space.

Is it brute-forceable?
In theory, yes — any 128-bit key cipher is, but not practically. 2 keyspace is still out of reach for exhaustive search, even with modern hardware (unless you’ve got a nation-state budget and some quantum fairy dust). There are no known practical attacks that break full XTEA when used correctly.

So yeah — it's not AES, but it's solid enough for real-world use on limited hardware like the Z80. Definitely way stronger than RC4, and far better than "roll-your-own XOR".

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