diff --git a/bundles/apt/items.py b/bundles/apt/items.py
index 3a46369..ee0e1b5 100644
--- a/bundles/apt/items.py
+++ b/bundles/apt/items.py
@@ -1,7 +1,5 @@
 # TODO pin repo: https://superuser.com/a/1595920
 
-from os.path import join
-from glob import glob
 from os.path import join, basename
 
 directories = {
@@ -71,43 +69,22 @@ actions = {
     },
 }
 
-# group sources by apt server hostname
+# create sources.lists and respective keyfiles
 
-hosts = {}
-
-for source_string in node.metadata.get('apt/sources'):
-    source = repo.libs.apt.AptSource(source_string)
-    hosts\
-        .setdefault(source.url.hostname, list())\
-        .append(source)
-
-# create sources lists and keyfiles
-
-for host, sources in hosts.items():
-    paths = glob(join(repo.path, 'data', 'apt', 'keys', f'{host}.*'))
-    assert len(paths) == 1
-    keyfile = basename(paths[0])
-    destination_path = f'/etc/apt/keyrings/{keyfile}'
-
-    for source in sources:
-        source.options['signed-by'] = [destination_path]
-
-    files[f'/etc/apt/sources.list.d/{host}.list'] = {
-        'content': '\n'.join(sorted(set(
-            str(source).format(
-                codename=node.metadata.get('os_codename'),
-                version=node.os_version[0], # WIP crystal
-            )
-                for source in sources
-        ))),
+for name, config in node.metadata.get('apt/sources').items():
+    # place keyfile
+    keyfile_destination_path = config['options']['Signed-By']
+    files[keyfile_destination_path] = {
+        'source': join(repo.path, 'data', 'apt', 'keys', basename(keyfile_destination_path)),
+        'content_type': 'binary',
         'triggers': {
             'action:apt_update',
         },
     }
 
-    files[destination_path] = {
-        'source': join(repo.path, 'data', 'apt', 'keys', keyfile),
-        'content_type': 'binary',
+    # place sources.list
+    files[f'/etc/apt/sources.list.d/{name}.sources'] = {
+        'content': repo.libs.apt.render_source(node, name),
         'triggers': {
             'action:apt_update',
         },
diff --git a/bundles/apt/metadata.py b/bundles/apt/metadata.py
index dc3a0cd..c09ab76 100644
--- a/bundles/apt/metadata.py
+++ b/bundles/apt/metadata.py
@@ -32,7 +32,7 @@ defaults = {
                 'Move-Autobit-Sections': 'oldlibs',
             },
         },
-        'sources': set(),
+        'sources': {},
     },
     'monitoring': {
         'services': {
@@ -54,6 +54,42 @@ defaults = {
 }
 
 
+@metadata_reactor.provides(
+    'apt/sources',
+)
+def key(metadata):
+    return {
+        'apt': {
+            'sources': {
+                source_name: {
+                    'key': source_name,
+                }
+                    for source_name, source_config in metadata.get('apt/sources').items()
+                    if 'key' not in source_config
+            },
+        },
+    }
+
+
+@metadata_reactor.provides(
+    'apt/sources',
+)
+def signed_by(metadata):
+    return {
+        'apt': {
+            'sources': {
+                source_name: {
+                    'options': {
+                        #'Signed-By': 'XXXXXXXX',
+                        'Signed-By': '/etc/apt/keyrings/' + metadata.get(f'apt/sources/{source_name}/key') + '.' + repo.libs.apt.find_keyfile_extension(repo, metadata.get(f'apt/sources/{source_name}/key')),
+                    },
+                }
+                    for source_name in metadata.get('apt/sources')
+            },
+        },
+    }
+
+
 @metadata_reactor.provides(
     'apt/config',
     'apt/packages',
diff --git a/bundles/crystal/metadata.py b/bundles/crystal/metadata.py
index 5bb1b83..dc91eb9 100644
--- a/bundles/crystal/metadata.py
+++ b/bundles/crystal/metadata.py
@@ -6,7 +6,13 @@ defaults = {
             'crystal': {},
         },
         'sources': {
-            f'deb https://download.opensuse.org/repositories/devel:/languages:/crystal/Debian_{debian_version}/ /',
+            'crystal': {
+                # https://software.opensuse.org/download.html?project=devel%3Alanguages%3Acrystal&package=crystal
+                'url': 'https://download.opensuse.org/repositories/devel:/languages:/crystal/Debian_Testing/',
+                'suites': {
+                    '/',
+                },
+            },
         },
     },
 }
diff --git a/bundles/gcloud/metadata.py b/bundles/gcloud/metadata.py
index 2112a61..e41e6c2 100644
--- a/bundles/gcloud/metadata.py
+++ b/bundles/gcloud/metadata.py
@@ -8,7 +8,15 @@ defaults = {
             'python3-crcmod': {},
         },
         'sources': {
-            'deb https://packages.cloud.google.com/apt cloud-sdk main',
+            'google-cloud': {
+                'url': 'https://packages.cloud.google.com/apt/',
+                'suites': {
+                    'cloud-sdk',
+                },
+                'components': {
+                    'main',
+                },
+            },
         },
     },
 }
diff --git a/bundles/grafana/metadata.py b/bundles/grafana/metadata.py
index 2285044..0a95923 100644
--- a/bundles/grafana/metadata.py
+++ b/bundles/grafana/metadata.py
@@ -8,8 +8,17 @@ defaults = {
             'grafana': {},
         },
         'sources': {
-            'deb https://packages.grafana.com/oss/deb stable main',
+            'grafana': {
+                'url': 'https://packages.grafana.com/oss/deb',
+                'suites': {
+                    'stable',
+                },
+                'components': {
+                    'main',
+                },
+            },
         },
+
     },
     'grafana': {
         'config': {
diff --git a/bundles/icinga2/metadata.py b/bundles/icinga2/metadata.py
index 511462a..c782940 100644
--- a/bundles/icinga2/metadata.py
+++ b/bundles/icinga2/metadata.py
@@ -9,8 +9,16 @@ defaults = {
             'monitoring-plugins': {},
         },
         'sources': {
-            'deb https://packages.icinga.com/debian icinga-{codename} main',
-            'deb-src https://packages.icinga.com/debian icinga-{codename} main',
+            'icinga': {
+                'types': {'deb', 'deb-src'},
+                'url': 'https://packages.icinga.com/debian',
+                'suites': {
+                    'icinga-{codename}',
+                },
+                'components': {
+                    'main',
+                },
+            },
         },
     },
     'icinga2': {
diff --git a/bundles/icingaweb2/metadata.py b/bundles/icingaweb2/metadata.py
index 6ef45cb..4a2c8a3 100644
--- a/bundles/icingaweb2/metadata.py
+++ b/bundles/icingaweb2/metadata.py
@@ -14,7 +14,16 @@ defaults = {
             'icingaweb2-module-monitoring': {},
         },
         'sources': {
-            'deb https://packages.icinga.com/debian icinga-{codename} main',
+            'icinga': {
+                'types': {'deb', 'deb-src'},
+                'url': 'https://packages.icinga.com/debian',
+                'suites': {
+                    'icinga-{codename}',
+                },
+                'components': {
+                    'main',
+                },
+            },
         },
     },
     'icingaweb2': {
diff --git a/bundles/influxdb2/metadata.py b/bundles/influxdb2/metadata.py
index c23b137..a2b6ef7 100644
--- a/bundles/influxdb2/metadata.py
+++ b/bundles/influxdb2/metadata.py
@@ -7,7 +7,15 @@ defaults = {
             'influxdb2-cli': {},
         },
         'sources': {
-            'deb https://repos.influxdata.com/debian stable main'
+            'influxdata': {
+                'url': 'https://repos.influxdata.com/debian',
+                'suites': {
+                    'stable',
+                },
+                'components': {
+                    'main',
+                },
+            },
         },
     },
     'nftables': {
diff --git a/bundles/nodejs/metadata.py b/bundles/nodejs/metadata.py
index faed20d..f59fc27 100644
--- a/bundles/nodejs/metadata.py
+++ b/bundles/nodejs/metadata.py
@@ -23,8 +23,19 @@ def sources(metadata):
     return {
         'apt': {
             'sources': {
-                f'deb https://deb.nodesource.com/node_{version}.x {{codename}} main',
-                f'deb-src https://deb.nodesource.com/node_{version}.x {{codename}} main',
+                'nodesource': {
+                    'types': {
+                        'deb',
+                        'deb-src',
+                    },
+                    'url': 'https://deb.nodesource.com/node_{version}.x',
+                    'suites': {
+                        '{codename}',
+                    },
+                    'components': {
+                        'main',
+                    },
+                },
             },
         },
     }
diff --git a/bundles/openhab/metadata.py b/bundles/openhab/metadata.py
index ff45932..40f05bc 100644
--- a/bundles/openhab/metadata.py
+++ b/bundles/openhab/metadata.py
@@ -9,7 +9,15 @@ defaults = {
             },
         },
         'sources': {
-            'deb https://openhab.jfrog.io/artifactory/openhab-linuxpkg stable main',
+            'jfrog': {
+                'url': 'https://openhab.jfrog.io/artifactory/openhab-linuxpkg',
+                'suites': {
+                    'stable',
+                },
+                'components': {
+                    'main',
+                },
+            },
         },
     },
     'zfs': {
diff --git a/bundles/telegraf/metadata.py b/bundles/telegraf/metadata.py
index 3f1802a..7de7e60 100644
--- a/bundles/telegraf/metadata.py
+++ b/bundles/telegraf/metadata.py
@@ -8,6 +8,17 @@ defaults = {
             'libgc-dev': {},
             'libevent-dev': {},
         },
+        'sources': {
+            'influxdata': {
+                'url': 'https://repos.influxdata.com/debian',
+                'suites': {
+                    'stable',
+                },
+                'components': {
+                    'main',
+                },
+            },
+        },
     },
     'telegraf': {
         'config': {
@@ -91,28 +102,6 @@ defaults = {
 }
 
 
-@metadata_reactor.provides(
-    'apt/sources',
-)
-def apt(metadata):
-    codename = {
-        'buster': 'buster',
-        'bullseye': 'bullseye',
-        'bookworm': 'bullseye',
-    }[metadata.get('os_codename')]
-
-    return {
-        'apt': {
-            'packages': {
-                'telegraf': {},
-            },
-            'sources': {
-                f"deb https://repos.influxdata.com/debian {codename} stable",
-            },
-        },
-    }
-
-
 @metadata_reactor.provides(
     'telegraf/config/outputs/influxdb_v2',
 )
diff --git a/data/apt/keys/download.opensuse.org.asc b/data/apt/keys/crystal.asc
similarity index 50%
rename from data/apt/keys/download.opensuse.org.asc
rename to data/apt/keys/crystal.asc
index 0130138..6c249ed 100644
--- a/data/apt/keys/download.opensuse.org.asc
+++ b/data/apt/keys/crystal.asc
@@ -1,5 +1,5 @@
 -----BEGIN PGP PUBLIC KEY BLOCK-----
-Version: GnuPG v2.0.15 (GNU/Linux)
+Version: GnuPG v1.4.5 (GNU/Linux)
 
 mQENBGCKr5QBCADXhCz8qeiL+fnILIae3pGcaXAzsFynb9S86pmWHTIwrZIBHA0y
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-=WWMN
+=yIwD
 -----END PGP PUBLIC KEY BLOCK-----
diff --git a/data/apt/keys/security.debian.org.asc b/data/apt/keys/debian-11-security.asc
similarity index 100%
rename from data/apt/keys/security.debian.org.asc
rename to data/apt/keys/debian-11-security.asc
diff --git a/data/apt/keys/deb.debian.org.asc b/data/apt/keys/debian-11.asc
similarity index 100%
rename from data/apt/keys/deb.debian.org.asc
rename to data/apt/keys/debian-11.asc
diff --git a/data/apt/keys/debian-12-security.asc b/data/apt/keys/debian-12-security.asc
new file mode 100644
index 0000000..713065d
--- /dev/null
+++ b/data/apt/keys/debian-12-security.asc
@@ -0,0 +1,186 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+
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diff --git a/data/apt/keys/debian-12.asc b/data/apt/keys/debian-12.asc
new file mode 100644
index 0000000..2e0b0e0
--- /dev/null
+++ b/data/apt/keys/debian-12.asc
@@ -0,0 +1,186 @@
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diff --git a/data/apt/keys/packages.cloud.google.com.gpg b/data/apt/keys/google-cloud.gpg
similarity index 100%
rename from data/apt/keys/packages.cloud.google.com.gpg
rename to data/apt/keys/google-cloud.gpg
diff --git a/data/apt/keys/packages.grafana.com.asc b/data/apt/keys/grafana.asc
similarity index 100%
rename from data/apt/keys/packages.grafana.com.asc
rename to data/apt/keys/grafana.asc
diff --git a/data/apt/keys/packages.icinga.com.asc b/data/apt/keys/icinga.asc
similarity index 100%
rename from data/apt/keys/packages.icinga.com.asc
rename to data/apt/keys/icinga.asc
diff --git a/data/apt/keys/influxdata.asc b/data/apt/keys/influxdata.asc
new file mode 100644
index 0000000..60aeaf6
--- /dev/null
+++ b/data/apt/keys/influxdata.asc
@@ -0,0 +1,29 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
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+-----END PGP PUBLIC KEY BLOCK-----
diff --git a/data/apt/keys/openhab.jfrog.io.asc b/data/apt/keys/jfrog.asc
similarity index 100%
rename from data/apt/keys/openhab.jfrog.io.asc
rename to data/apt/keys/jfrog.asc
diff --git a/data/apt/keys/deb.nodesource.com.asc b/data/apt/keys/nodesource.asc
similarity index 100%
rename from data/apt/keys/deb.nodesource.com.asc
rename to data/apt/keys/nodesource.asc
diff --git a/data/apt/keys/repo.delellis.com.ar.asc b/data/apt/keys/repo.delellis.com.ar.asc
deleted file mode 100644
index f352d69..0000000
--- a/data/apt/keys/repo.delellis.com.ar.asc
+++ /dev/null
@@ -1,41 +0,0 @@
------BEGIN PGP PUBLIC KEY BLOCK-----
-
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-oxYE/j3yxh9TmgHv54/j2ZzU8tiJHW01AGlbbxo=
-=cWkh
------END PGP PUBLIC KEY BLOCK-----
diff --git a/data/apt/keys/repos.influxdata.com.asc b/data/apt/keys/repos.influxdata.com.asc
deleted file mode 100644
index 6a4413f..0000000
--- a/data/apt/keys/repos.influxdata.com.asc
+++ /dev/null
@@ -1,64 +0,0 @@
------BEGIN PGP PUBLIC KEY BLOCK-----
-
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-=mg0I
------END PGP PUBLIC KEY BLOCK-----
diff --git a/groups/os/debian-11.py b/groups/os/debian-11.py
index 8fadbad..6cd7198 100644
--- a/groups/os/debian-11.py
+++ b/groups/os/debian-11.py
@@ -5,10 +5,12 @@
     'metadata': {
         'apt': {
             'sources': {
-                'deb https://deb.debian.org/debian {codename} main contrib non-free',
-                'deb https://deb.debian.org/debian {codename}-updates main contrib non-free',
-                'deb https://deb.debian.org/debian {codename}-backports main contrib non-free',
-                'deb https://security.debian.org/ {codename}-security main contrib non-free',
+                'debian': {
+                    'key': 'debian-11',
+                },
+                'debian-security': {
+                    'key': 'debian-11-security',
+                },
             },
         },
         'php': {
diff --git a/groups/os/debian-12.py b/groups/os/debian-12.py
index 27ab6dc..d6db85d 100644
--- a/groups/os/debian-12.py
+++ b/groups/os/debian-12.py
@@ -5,10 +5,18 @@
     'metadata': {
         'apt': {
             'sources': {
-                'deb https://deb.debian.org/debian {codename} main contrib non-free non-free-firmware',
-                'deb https://deb.debian.org/debian {codename}-updates main contrib non-free non-free-firmware',
-                'deb https://deb.debian.org/debian {codename}-backports main contrib non-free non-free-firmware',
-                'deb https://security.debian.org/ {codename}-security main contrib non-free non-free-firmware',
+                'debian': {
+                    'components': {
+                        'non-free-firmware',
+                    },
+                    'key': 'debian-12',
+                },
+                'debian-security': {
+                    'components': {
+                        'non-free-firmware',
+                    },
+                    'key': 'debian-12-security',
+                },
             },
         },
         'php': {
diff --git a/groups/os/debian.py b/groups/os/debian.py
index 3a9c57e..7061503 100644
--- a/groups/os/debian.py
+++ b/groups/os/debian.py
@@ -1,3 +1,5 @@
+# https://ftp-master.debian.org/keys.html
+
 {
     'supergroups': [
         'linux',
@@ -9,10 +11,35 @@
     ],
     'metadata': {
         'apt': {
+            'sources': {
+                'debian': {
+                    'url': 'https://deb.debian.org/debian',
+                    'suites': {
+                        '{codename}',
+                        '{codename}-updates',
+                        '{codename}-backports',
+                    },
+                    'components': {
+                        'main',
+                        'contrib',
+                        'non-free',
+                    },
+                },
+                'debian-security': {
+                    'url': 'https://security.debian.org/',
+                    'suites': {
+                        '{codename}-security',
+                    },
+                    'components': {
+                        'main',
+                        'contrib',
+                        'non-free',
+                    },
+                },
+            },
             'packages': {
                 'mtr-tiny': {},
             },
-            # https://ftp-master.debian.org/keys.html
         },
     },
     'os': 'debian',
diff --git a/libs/apt.py b/libs/apt.py
index 8af983a..e7eab5d 100644
--- a/libs/apt.py
+++ b/libs/apt.py
@@ -1,13 +1,20 @@
 # https://manpages.debian.org/jessie/apt/sources.list.5.de.html
 
-from urllib.parse import urlparse
-from re import search, sub
-from functools import total_ordering
 from re import match
+from glob import glob
+from os.path import join, basename, exists
+
+
+def find_keyfile_extension(repo, key_name):
+    for extension in ('asc', 'gpg'):
+        if exists(join(repo.path, 'data', 'apt', 'keys', f'{key_name}.{extension}')):
+            return extension
+    else:
+        raise Exception(f"no keyfile '{key_name}.(asc|gpg)' found")
 
 
 def render_apt_conf(section, depth=0):
-    buffer = ""
+    buffer = ''
 
     for k,v in sorted(section.items()):
         if isinstance(v, dict):
@@ -29,72 +36,52 @@ def render_apt_conf(section, depth=0):
     return buffer
 
 
-@total_ordering
-class AptSource():
-    def __init__(self, string):
-        # parse options, which are optional
-        if search(r'\[.*\]', string):
-            self.options = {
-                k:v.split(',')
-                    for k,v in (
-                        e.split('=') for e in search(r'\[(.*)\]', string)[1].split()
-                    )
-            }
-            string_without_options = sub(r'\[.*\]', '', string)
-        else:
-            self.options = {}
-            string_without_options = string
 
-        # parse rest of source, now in defined order
-        parts = string_without_options.split()
-        self.type = parts[0]
-        self.url = urlparse(parts[1])
-        self.suite = parts[2]
-        self.components = parts[3:]
+# https://repolib.readthedocs.io/en/latest/deb822-format.html
+def render_source(node, source_name):
+    config = node.metadata.get(f'apt/sources/{source_name}')
+    lines = []
 
-    def __str__(self):
-        parts = [
-            self.type,
-            self.url.geturl(),
-            self.suite,
-            ' '.join(self.components),
-        ]
+    # X-Repolib-Name
+    lines.append(
+        f'X-Repolib-Name: ' + source_name
+    )
 
-        if self.options:
-            parts.insert(
-                1,
-                "[{}]".format(
-                    ' '.join(
-                        '{}={}'.format(
-                            k,
-                            ','.join(v)
-                        ) for k,v in self.options.items()
-                    )
-                )
-            )
+    # types
+    lines.append(
+        f'Types: ' + ' '.join(sorted(config.get('types', {'deb'})))
+    )
 
-        return ' '.join(parts)
+    # url
+    lines.append(
+        f'URIs: ' + config['url']
+    )
 
+    # suites
+    lines.append(
+        f'Suites: ' + ' '.join(sorted(config['suites']))
+    )
 
-    def __eq__(self, other):
-        return str(self) == str(other)
+    # components
+    if 'components' in config:
+        lines.append(
+            f'Components: ' + ' '.join(sorted(config['components']))
+        )
 
-    def __lt__(self, other):
-        return str(self) < str(other)
+    # options
+    for key, value in sorted(config['options'].items()):
+        if isinstance(value, (set, list)):
+            value = ' '.join(value)
 
-    def __hash__(self):
-        return hash(str(self))
+        lines.append(
+            f'{key}: ' + value
+        )
 
-    def __repr__(self):
-        return f"{type(self).__name__}('{str(self)}')"
+    # render to string and replace version/codename
+    string = '\n'.join(lines).format(
+        codename=node.metadata.get('os_codename'),
+        version=node.os_version[0], # WIP crystal
+    ) + '\n'
 
-
-# source = AptSource('deb [arch=amd64 trusted=true] http://deb.debian.org/debian buster-backports main contrib non-free')
-# print(repr(source))
-# print(source.type)
-# print(source.options)
-# source.options['test'] = ['was', 'ist', 'das']
-# print(source.url)
-# print(source.suite)
-# print(source.components)
-# print(str(source))
+    # return
+    return string