When I try to share my session between different app, it is like the session in one app is not the same than in the other app... I don't use subdomain I just use different uri segment for each application. I'm sorry for my poor explanations but I don't really know about cookies... :/
Thanks to people who will think about my problem ! :)
I fix this issue and I hope that this fix can help people ! The crypt config in each app was containing different values, so I take the same values for each applications and session uncrypt work between apps now ;) !