What is the meaning of "transcipher" (if such term exists) recently I heard the term "transcipher" during a discussion (seems something related to double encryption using two different keys), but I was not able to find any information about such a term in the internet. Is it an actual cryptography term? if so, what does it mean?
It is a command of the german health card.
See here for the RSA version. There exists also  an ECC version for the generation 2 card. The specification is also on the www.gematik.de web site but its a bit tricky to find it.