Now dated (and #free) #book I wrote about #PGP & #remailers 20+ years ago, just after I'd set up the UK's (world's?) first online-only professional services set of barristers' chambers (Virtual Chambers):
https://mega.nz/file/jsplULpR#4K6CmI1YqCSRZhiAj83hRHqi9DBpTkdIt0hWzilV3v8
If the above link is broken, try reconstructing the link (from two parts) as follows:
#4K6CmI1YqCSRZhiAj83hRHqi9DBpTkdIt0hWzilV3v8