[ok123456]

It's more of intentionally reducing the keyspace when generating keys. You can use weakly generated keys with industry-standard encryption algorithms. When your 4096-bit key is only 32 bits, it doesn't matter how well-trusted the algorithm is.

[tptacek]

I just skimmed the paper but it looked to me like the key generation is the same in all profiles, but the TEA1 case has a key setup that compresses the generated key down to 32 bits.

[jnwatson]

The researchers found several problems. The backdoor seems intentional, but the others do not. They broke the TAA protocol.