diff --git a/cmd/tdf-decrypt.go b/cmd/tdf-decrypt.go
index 5adbaf84..6bed38fc 100644
--- a/cmd/tdf-decrypt.go
+++ b/cmd/tdf-decrypt.go
@@ -15,6 +15,7 @@ import (
 var TDF = "tdf"
 
 var assertionVerification string
+var kasAllowList []string
 
 const TDF_MAX_FILE_SIZE = int64(10 * 1024 * 1024 * 1024) // 10 GB
 
@@ -59,7 +60,16 @@ func dev_tdfDecryptCmd(cmd *cobra.Command, args []string) {
 		cli.ExitWithError("Must provide ONE of the following to decrypt: [file argument, stdin input]", errors.New("no input provided"))
 	}
 
-	decrypted, err := h.DecryptBytes(bytesToDecrypt, assertionVerification, disableAssertionVerification, sessionKeyAlgorithm)
+	ignoreAllowlist := len(kasAllowList) == 1 && kasAllowList[0] == "*"
+
+	decrypted, err := h.DecryptBytes(
+		bytesToDecrypt,
+		assertionVerification,
+		disableAssertionVerification,
+		sessionKeyAlgorithm,
+		kasAllowList,
+		ignoreAllowlist,
+	)
 	if err != nil {
 		cli.ExitWithError("Failed to decrypt file", err)
 	}
@@ -115,6 +125,13 @@ func init() {
 		decryptCmd.GetDocFlag("no-verify-assertions").DefaultAsBool(),
 		decryptCmd.GetDocFlag("no-verify-assertions").Description,
 	)
+	decryptCmd.Flags().StringSliceVarP(
+		&kasAllowList,
+		decryptCmd.GetDocFlag("kas-allowlist").Name,
+		decryptCmd.GetDocFlag("kas-allowlist").Shorthand,
+		nil,
+		decryptCmd.GetDocFlag("kas-allowlist").Description,
+	)
 
 	decryptCmd.Command.GroupID = TDF
 
diff --git a/docs/man/decrypt/_index.md b/docs/man/decrypt/_index.md
index 8bd8f6bc..2f40c067 100644
--- a/docs/man/decrypt/_index.md
+++ b/docs/man/decrypt/_index.md
@@ -25,6 +25,8 @@ command:
     - name: with-assertion-verification-keys
       description: >
         EXPERIMENTAL: path to JSON file of keys to verify signed assertions. See examples for more information.
+    - name: kas-allowlist
+      description: A custom allowlist of comma-separated KAS Urls, e.g. `https://example.com/kas,http://localhost:8080`. If none specified, the platform will use the list of KASes in the KAS registry. To ignore the allowlist, use a quoted wildcard e.g. `--kas-allowlist '*'` **WARNING:** Bypassing the allowlist may expose you to potential security risks, as untrusted KAS URLs could be used.
 ---
 
 Decrypt a Trusted Data Format (TDF) file and output the contents to stdout or a file in the current working directory.
diff --git a/e2e/encrypt-decrypt.bats b/e2e/encrypt-decrypt.bats
index e0af5269..bd234e0e 100755
--- a/e2e/encrypt-decrypt.bats
+++ b/e2e/encrypt-decrypt.bats
@@ -53,6 +53,11 @@ setup_file() {
   export MIXED_CASE_FQN="https://Testing-Enc-Dec.io/attr/Attr1/value/VALUE1"
 }
 
+setup() {
+    load "${BATS_LIB_PATH}/bats-support/load.bash"
+    load "${BATS_LIB_PATH}/bats-assert/load.bash"
+}
+
 teardown() {
     rm -f $OUTFILE_GO_MOD $RESULTFILE_GO_MOD $OUTFILE_TXT
 }
@@ -152,3 +157,43 @@ teardown_file(){
   schema_version_present=$(./otdfctl --host $HOST --tls-no-verify $WITH_CREDS inspect $OUTFILE_GO_MOD | jq '.manifest | has("schemaVersion")')
   [[ $schema_version_present == true ]]
 }
+
+@test "roundtrip TDF3, with allowlist containing platform kas" {
+  ./otdfctl encrypt -o $OUTFILE_GO_MOD --host $HOST --tls-no-verify $DEBUG_LEVEL $WITH_CREDS --tdf-type tdf3  $INFILE_GO_MOD
+  run sh -c "./otdfctl decrypt --host $HOST --tls-no-verify $DEBUG_LEVEL $WITH_CREDS --tdf-type tdf3 --kas-allowlist http://localhost:8080/kas $OUTFILE_GO_MOD"
+  assert_success
+}
+
+@test "roundtrip TDF3, with allowlist containing non existent kas (should fail)" {
+  ./otdfctl encrypt -o $OUTFILE_GO_MOD --host $HOST --tls-no-verify $DEBUG_LEVEL $WITH_CREDS --tdf-type tdf3 $INFILE_GO_MOD
+  run sh -c "./otdfctl decrypt --host $HOST --tls-no-verify $DEBUG_LEVEL $WITH_CREDS --tdf-type tdf3 --kas-allowlist http://not-a-real-kas.com/kas $OUTFILE_GO_MOD"
+  assert_failure
+  assert_output --partial "KasAllowlist: kas url http://localhost:8080/kas is not allowed"
+}
+
+@test "roundtrip TDF3, ignoring allowlist" {
+  ./otdfctl encrypt -o $OUTFILE_GO_MOD --host $HOST --tls-no-verify $DEBUG_LEVEL $WITH_CREDS --tdf-type tdf3  $INFILE_GO_MOD
+  run sh -c "./otdfctl decrypt --host $HOST --tls-no-verify $DEBUG_LEVEL $WITH_CREDS --tdf-type tdf3 --kas-allowlist '*' $OUTFILE_GO_MOD"
+  assert_success
+  assert_output --partial "KasAllowlist is ignored"
+}
+
+@test "roundtrip NANO, with allowlist containing platform kas" {
+  ./otdfctl encrypt -o $OUTFILE_GO_MOD --host $HOST --tls-no-verify $DEBUG_LEVEL $WITH_CREDS --tdf-type nano  $INFILE_GO_MOD
+  run sh -c "./otdfctl decrypt --host $HOST --tls-no-verify $DEBUG_LEVEL $WITH_CREDS --tdf-type nano --kas-allowlist http://localhost:8080/kas $OUTFILE_GO_MOD"
+  assert_success
+}
+
+@test "roundtrip NANO, with allowlist containing non existent kas (should fail)" {
+  ./otdfctl encrypt -o $OUTFILE_GO_MOD --host $HOST --tls-no-verify $DEBUG_LEVEL $WITH_CREDS --tdf-type nano $INFILE_GO_MOD
+  run sh -c "./otdfctl decrypt --host $HOST --tls-no-verify $DEBUG_LEVEL $WITH_CREDS --tdf-type nano --kas-allowlist http://not-a-real-kas.com/kas $OUTFILE_GO_MOD"
+  assert_failure
+  assert_output --partial "KasAllowlist: kas url http://localhost:8080/kas is not allowed"
+}
+
+@test "roundtrip NANO, ignoring allowlist" {
+  ./otdfctl encrypt -o $OUTFILE_GO_MOD --host $HOST --tls-no-verify $DEBUG_LEVEL $WITH_CREDS --tdf-type nano  $INFILE_GO_MOD
+  run sh -c "./otdfctl decrypt --host $HOST --tls-no-verify $DEBUG_LEVEL $WITH_CREDS --tdf-type nano --kas-allowlist '*' $OUTFILE_GO_MOD"
+  assert_success
+  assert_output --partial "KasAllowlist is ignored"
+}
diff --git a/go.mod b/go.mod
index 66aee40a..b1244043 100644
--- a/go.mod
+++ b/go.mod
@@ -20,7 +20,7 @@ require (
 	github.com/opentdf/platform/lib/flattening v0.1.3
 	github.com/opentdf/platform/lib/ocrypto v0.1.9
 	github.com/opentdf/platform/protocol/go v0.3.1
-	github.com/opentdf/platform/sdk v0.4.3
+	github.com/opentdf/platform/sdk v0.4.4
 	github.com/spf13/cobra v1.9.1
 	github.com/spf13/viper v1.19.0
 	github.com/stretchr/testify v1.10.0
diff --git a/go.sum b/go.sum
index e5ddd377..6fe63df2 100644
--- a/go.sum
+++ b/go.sum
@@ -234,8 +234,8 @@ github.com/opentdf/platform/lib/ocrypto v0.1.9 h1:GvgPB7CoK7JmWvsSvJ0hc+RC0wezgc
 github.com/opentdf/platform/lib/ocrypto v0.1.9/go.mod h1:UTtqh8mvhAYA+sEnaMxpr/406e84L5Q1sAxtKGIXfu4=
 github.com/opentdf/platform/protocol/go v0.3.1 h1:vEGD8KaXK56S9HcqSGUEDOhVuAdHlHzPk1tuMSX+Xc8=
 github.com/opentdf/platform/protocol/go v0.3.1/go.mod h1:nErYkgt32GW22CNqSyLO+JE49C3JndI1TsVdF+CUYd4=
-github.com/opentdf/platform/sdk v0.4.3 h1:oaBw6OL7AVkgAfYPATM6ji3nbSvg2RBq3I264VlJlco=
-github.com/opentdf/platform/sdk v0.4.3/go.mod h1:xPjymAKCbFzo+z+PvFVa10NOT+9i5ljxmJaGJ9tkPrw=
+github.com/opentdf/platform/sdk v0.4.4 h1:jBJPXZBOodmanla9aS1aaPQgcg7zqOEbBTLF0c0BULM=
+github.com/opentdf/platform/sdk v0.4.4/go.mod h1:xPjymAKCbFzo+z+PvFVa10NOT+9i5ljxmJaGJ9tkPrw=
 github.com/opentracing/opentracing-go v1.2.0 h1:uEJPy/1a5RIPAJ0Ov+OIO8OxWu77jEv+1B0VhjKrZUs=
 github.com/opentracing/opentracing-go v1.2.0/go.mod h1:GxEUsuufX4nBwe+T+Wl9TAgYrxe9dPLANfrWvHYVTgc=
 github.com/pelletier/go-toml/v2 v2.2.2 h1:aYUidT7k73Pcl9nb2gScu7NSrKCSHIDE89b3+6Wq+LM=
diff --git a/pkg/handlers/tdf.go b/pkg/handlers/tdf.go
index ef2e54c5..84ded432 100644
--- a/pkg/handlers/tdf.go
+++ b/pkg/handlers/tdf.go
@@ -131,19 +131,36 @@ func (h Handler) EncryptBytes(
 	}
 }
 
-func (h Handler) DecryptBytes(toDecrypt []byte, assertionVerificationKeysFile string, disableAssertionCheck bool, sessionKeyAlgorithm ocrypto.KeyType) (*bytes.Buffer, error) {
+func (h Handler) DecryptBytes(
+	toDecrypt []byte,
+	assertionVerificationKeysFile string,
+	disableAssertionCheck bool,
+	sessionKeyAlgorithm ocrypto.KeyType,
+	kasAllowList []string,
+	ignoreAllowlist bool,
+) (*bytes.Buffer, error) {
 	out := &bytes.Buffer{}
 	pt := io.Writer(out)
 	ec := bytes.NewReader(toDecrypt)
 	switch sdk.GetTdfType(ec) {
 	case sdk.Nano:
-		if _, err := h.sdk.ReadNanoTDF(pt, ec); err != nil {
+		opts := []sdk.NanoTDFReaderOption{
+			sdk.WithNanoIgnoreAllowlist(ignoreAllowlist),
+		}
+		if kasAllowList != nil {
+			opts = append(opts, sdk.WithNanoKasAllowlist(kasAllowList))
+		}
+		if _, err := h.sdk.ReadNanoTDF(pt, ec, opts...); err != nil {
 			return nil, err
 		}
 	case sdk.Standard:
 		opts := []sdk.TDFReaderOption{
 			sdk.WithDisableAssertionVerification(disableAssertionCheck),
-			sdk.WithSessionKeyType(sessionKeyAlgorithm)}
+			sdk.WithSessionKeyType(sessionKeyAlgorithm),
+			sdk.WithIgnoreAllowlist(ignoreAllowlist)}
+		if kasAllowList != nil {
+			opts = append(opts, sdk.WithKasAllowlist(kasAllowList))
+		}
 		var assertionVerificationKeys sdk.AssertionVerificationKeys
 		if assertionVerificationKeysFile != "" {
 			// read the file