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XTEA is a block cipher. It requires a block cipher mode of operation to work. Together with a block cipher mode of operation you can generate something that is secure. For this you require at least an IV, as you may otherwise encrypt identical passwords (for different users) to identical values. Or, if you encrypt each character separately, the same ...


Diffusion is a requirement for a secure cipher, but it is not by itself sufficient. So even if a certain number of rounds has "full diffusion", it does not mean that the number of rounds is enough. In the case of Treyfer, the decryption direction requires five more rounds for full diffusion, but the suggested number of rounds is much higher at 32. (Even that ...

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