We present the first-ever global simulation of the full Earth system at 1.25 km grid spacing, achieving highest time compression with an unseen number of degrees of freedom. Our model captures the flow of energy, water, and carbon through key components of the Earth system: atmosphere, ocean, and land. To achieve this landmark simulation, we harness the power of 8192 GPUs on Alps and 20480 GPUs on JUPITER, two of the world’s largest GH200 superchip installations. We use both the Grace CPUs and Hopper GPUs by carefully balancing Earth’s components in a heterogeneous setup and optimizing acceleration techniques available in ICON’s codebase. We show how separation of concerns can reduce the code complexity by half while increasing performance and portability. Our achieved time compression of 145.7 simulated days per day enables long studies including full interactions in the Earth system and even outperforms earlier atmosphere-only simulations at a similar resolution.

In FDTC 2009, Li et al. published a DFA attack [20] against the symmetric block cipher SHACAL1 [11]. This block cipher substantially consists of the compression function of the hash function SHA1 [16] except for the final addition operation. When using the SHA1 compression function as a primitive in a keyed hash function like HMAC-SHA1 [17] or in a key derivation function it might be of some interest if the attack of Li et al. also applies to the SHA1 compression function. However, the final addition operation turns out to completely prevent this direct application. In this paper we extend the attack of Li et al. in order to overcome the problem of the final addition and to extract the secret inputs of the SHA1 compression function by analysing faulty outputs. Our implementation of the new attack needs about 1000 faulty outputs and a computation time of three hours on a normal PC to fully extract the secret inputs with high probability.