This paper analyses the cryptography used in the Open Smart Grid Protocol (OSGP). The authenticated encryption (AE) scheme deployed by OSGP is a non-standard composition of RC4 and a homebrewed MAC, the “OMA digest”. We present several practical key-recovery attacks against the OMA digest. The first and basic variant can achieve this with a mere 13 queries to an OMA digest oracle and negligible...

It is rarely the case that an analyst is presented with a sample in a suitable form for injection into an LC/MS system. Often the sample must be manipulated to concentrate the compound of interest, remove interferences, enzymatically digest the sample to generate surrogate peptides with better mass spectrometric properties, and modify the sample matrix or buffering system to achieve compatibili...