LAWFUL INTERCEPTION SECURITY

A first lawful interception (LI) function (110) transmits, to a second LI function (101) in a virtualized network function, VNF (103), a request for random number generator, RNG, data, characterizing a random number generator (105) in the second LI function (101). The RNG data is tested, resulting in a randomness test result that is indicative of randomness of numbers generated by the RNG (105) in the second LI function (101). If the randomness is below a first threshold, mitigation takes place of any undesired effect associated with the randomness being less than the threshold value. A corresponding method is performed by the second LI function (101), receiving the request for RNG data, obtaining and transmitting the RNG data to the first LI function (110). Verification can thereby be made whether a LI function in a VNF has a proper level of entropy source for use by its cryptographic operations and, if not, perform mitigation. 第一合法拦截LI功能(110)向虚拟化网络功能VNF(103)中的第二LI功能(101)发送对随机数生成器RNG数据的请求，所述RNG数据表征所述第二LI功能(1