I think this is wrong. It claims that the problem in IDEA comes from the bias of the multiplication operation... but the multiply in IDEA is over the integers modulo 65537, with the 0 value representing 65536, not 0... this is in fact an unbiased operation. However I have not attempted to verify the rest of the logic. Anonymous writes:
Is IDEA secure ?
The IDEA algorithm (patented by ASCOM) is the core algorithmm used in PGP. It is based on a rotating 128 bit key split into 16 bit segments. The algorthm converts 64 bits of data at a time using the following operations '+', '^' (exclusive-or) and '*'.
The formulas are :
[...]
Given a large random data message (ie 1000 samples - 64*1000 = 8Kb file). The distribution of the above operations can be used to break the key. ie both the '+' and the '^' operations give an even distribution but the '*' operator gives a biased distribution towards '0'.
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